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Date: Mon, 10 Aug 2015 09:37:06 -0400 From: Sasha Levin <sasha.levin@...cle.com> To: Peter Zijlstra <peterz@...radead.org>, Andrew Morton <akpm@...ux-foundation.org>, Mel Gorman <mgorman@...e.de>, Johannes Weiner <hannes@...xchg.org>, Michal Hocko <mhocko@...e.cz> CC: "linux-mm@...ck.org" <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org> Subject: mm: use after free and panic in free_pages_and_swap_cache Hi all, While fuzzing with trinity inside a KVM tools guest running -next I've stumbled on the following: [486475.535183] ================================================================== [486475.536099] BUG: KASan: use after free in tlb_flush_mmu_free+0xfe/0x120 at addr ffff8803c3a62008 [486475.537936] Read of size 4 by task trinity-c218/7429 [486475.538464] page:ffffea000f0e9880 count:1 mapcount:0 mapping: (null) index:0x0 [486475.539252] flags: 0x22fffff80000000() [486475.539735] page dumped because: kasan: bad access detected [486475.540313] CPU: 5 PID: 7429 Comm: trinity-c218 Not tainted 4.2.0-rc5-next-20150806-sasha-00040-g1b47b00-dirty #2418 [486475.541464] ffff880406b27910 ffff880406b277c0 ffffffffa1e89e54 ffff880406b27848 [486475.542260] ffff880406b27838 ffffffff9877299e ffffffff983b359d ffff880406b277f0 [486475.543146] 0000000000000282 ffff880406b27800 ffffffff983b359d 0000000000000001 [486475.543994] Call Trace: [486475.544260] dump_stack (lib/dump_stack.c:52) [486475.544841] kasan_report_error (mm/kasan/report.c:132 mm/kasan/report.c:193) [486475.545445] ? get_parent_ip (kernel/sched/core.c:2796) [486475.545983] ? get_parent_ip (kernel/sched/core.c:2796) [486475.546520] __asan_report_load4_noabort (mm/kasan/report.c:250) [486475.547163] ? tlb_flush_mmu_free (mm/memory.c:254) [486475.547760] tlb_flush_mmu_free (mm/memory.c:254) [486475.548335] tlb_finish_mmu (mm/memory.c:280) [486475.548873] exit_mmap (mm/mmap.c:2865) [486475.549386] ? SyS_remap_file_pages (mm/mmap.c:2827) [486475.550007] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486475.550613] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486475.551215] mmput (include/linux/compiler.h:207 kernel/fork.c:737 kernel/fork.c:704) [486475.551688] do_exit (./arch/x86/include/asm/bitops.h:311 include/linux/thread_info.h:91 kernel/exit.c:438 kernel/exit.c:733) [486475.552194] ? mm_update_next_owner (kernel/exit.c:654) [486475.552811] ? lockdep_init (kernel/locking/lockdep.c:3298) [486475.553348] ? lock_release (kernel/locking/lockdep.c:3644) [486475.553973] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486475.555012] do_group_exit (./arch/x86/include/asm/current.h:14 kernel/exit.c:859) [486475.555884] get_signal (kernel/signal.c:2353) [486475.556693] do_signal (arch/x86/kernel/signal.c:711) [486475.557521] ? do_readv_writev (include/linux/fsnotify.h:223 fs/read_write.c:821) [486475.558443] ? v9fs_file_lock_dotl (fs/9p/vfs_file.c:407) [486475.559266] ? vfs_write (fs/read_write.c:777) [486475.559996] ? setup_sigcontext (arch/x86/kernel/signal.c:708) [486475.560929] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486475.561961] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486475.562647] ? preempt_count_sub (kernel/sched/core.c:2852) [486475.563385] ? _raw_spin_unlock_irq (./arch/x86/include/asm/preempt.h:95 include/linux/spinlock_api_smp.h:171 kernel/locking/spinlock.c:199) [486475.564207] ? do_setitimer (kernel/time/itimer.c:239) [486475.564977] ? check_preemption_disabled (lib/smp_processor_id.c:18) [486475.565909] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486475.566886] prepare_exit_to_usermode (arch/x86/entry/common.c:282) [486475.567791] syscall_return_slowpath (arch/x86/entry/common.c:349) [486475.568763] int_ret_from_sys_call (arch/x86/entry/entry_64.S:282) [486475.569557] Memory state around the buggy address: [486475.570069] ffff8803c3a61f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.571142] ffff8803c3a61f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.572127] >ffff8803c3a62000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.573188] ^ [486475.573641] ffff8803c3a62080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.574584] ffff8803c3a62100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.575524] ================================================================== [486475.577906] FAULT_INJECTION: forcing a failure. [486475.577906] name failslab, interval 50, probability 30, space 0, times -1 [486475.593541] ================================================================== [486475.595556] BUG: KASan: use after free in free_pages_and_swap_cache+0x17d/0x1a0 at addr ffff8803c3a62010 [486475.596984] Read of size 8 by task trinity-c218/7429 [486475.597908] page:ffffea000f0e9880 count:1 mapcount:0 mapping: (null) index:0x0 [486475.599883] flags: 0x22fffff80000000() [486475.600674] page dumped because: kasan: bad access detected [486475.601859] CPU: 5 PID: 7429 Comm: trinity-c218 Not tainted 4.2.0-rc5-next-20150806-sasha-00040-g1b47b00-dirty #2418 [486475.603504] dffffc0000000000 ffff880406b27778 ffffffffa1e89e54 ffff880406b27800 [486475.604831] ffff880406b277f0 ffffffff9877299e ffffffff9869c496 ffffed005803b45c [486475.606150] 0000000000000282 ffffffff98696fe0 ffffffffa1f110e2 ffff8803df648000 [486475.607404] Call Trace: [486475.607824] dump_stack (lib/dump_stack.c:52) [486475.608689] kasan_report_error (mm/kasan/report.c:132 mm/kasan/report.c:193) [486475.609709] ? pagevec_lru_move_fn (include/linux/pagevec.h:44 mm/swap.c:445) [486475.610696] ? trace_event_raw_event_mm_lru_activate (mm/swap.c:1079) [486475.611952] ? _raw_spin_unlock_irqrestore (kernel/locking/spinlock.c:192) [486475.613072] __asan_report_load8_noabort (mm/kasan/report.c:251) [486475.614177] ? free_pages_and_swap_cache (mm/swap_state.c:265) [486475.615431] free_pages_and_swap_cache (mm/swap_state.c:265) [486475.616748] tlb_flush_mmu_free (mm/memory.c:256 (discriminator 4)) [486475.617722] tlb_finish_mmu (mm/memory.c:280) [486475.618691] exit_mmap (mm/mmap.c:2865) [486475.619527] ? SyS_remap_file_pages (mm/mmap.c:2827) [486475.620734] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486475.621666] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486475.622698] mmput (include/linux/compiler.h:207 kernel/fork.c:737 kernel/fork.c:704) [486475.623453] do_exit (./arch/x86/include/asm/bitops.h:311 include/linux/thread_info.h:91 kernel/exit.c:438 kernel/exit.c:733) [486475.624312] ? mm_update_next_owner (kernel/exit.c:654) [486475.625379] ? lockdep_init (kernel/locking/lockdep.c:3298) [486475.626305] ? lock_release (kernel/locking/lockdep.c:3644) [486475.627285] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486475.627835] FAULT_INJECTION: forcing a failure. [486475.627835] name failslab, interval 50, probability 30, space 0, times -1 [486475.631698] do_group_exit (./arch/x86/include/asm/current.h:14 kernel/exit.c:859) [486475.633017] get_signal (kernel/signal.c:2353) [486475.633997] do_signal (arch/x86/kernel/signal.c:711) [486475.635136] ? do_readv_writev (include/linux/fsnotify.h:223 fs/read_write.c:821) [486475.636766] ? v9fs_file_lock_dotl (fs/9p/vfs_file.c:407) [486475.637879] ? vfs_write (fs/read_write.c:777) [486475.638895] ? setup_sigcontext (arch/x86/kernel/signal.c:708) [486475.640246] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486475.641623] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486475.642807] ? preempt_count_sub (kernel/sched/core.c:2852) [486475.644075] ? _raw_spin_unlock_irq (./arch/x86/include/asm/preempt.h:95 include/linux/spinlock_api_smp.h:171 kernel/locking/spinlock.c:199) [486475.645137] ? do_setitimer (kernel/time/itimer.c:239) [486475.646019] ? check_preemption_disabled (lib/smp_processor_id.c:18) [486475.647120] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486475.648157] prepare_exit_to_usermode (arch/x86/entry/common.c:282) [486475.649274] syscall_return_slowpath (arch/x86/entry/common.c:349) [486475.650319] int_ret_from_sys_call (arch/x86/entry/entry_64.S:282) [486475.651264] Memory state around the buggy address: [486475.652239] ffff8803c3a61f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.653704] ffff8803c3a61f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.655116] >ffff8803c3a62000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.656311] ^ [486475.656924] ffff8803c3a62080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.658088] ffff8803c3a62100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.659196] ================================================================== [486475.668686] ================================================================== [486475.669882] BUG: KASan: use after free in free_pages_and_swap_cache+0x17d/0x1a0 at addr ffff8803c3a62018 [486475.671308] Read of size 8 by task trinity-c218/7429 [486475.672128] page:ffffea000f0e9880 count:1 mapcount:0 mapping: (null) index:0x0 [486475.673375] flags: 0x22fffff80000000() [486475.673990] page dumped because: kasan: bad access detected [486475.674886] CPU: 5 PID: 7429 Comm: trinity-c218 Not tainted 4.2.0-rc5-next-20150806-sasha-00040-g1b47b00-dirty #2418 [486475.677047] dffffc0000000000 ffff880406b27778 ffffffffa1e89e54 ffff880406b27800 [486475.679387] ffff880406b277f0 ffffffff9877299e 0000000000000010 ffffed0000000000 [486475.681127] 0000000000000282 ffffed007874c402 66666620a1f110e2 6133633330383866 [486475.682449] Call Trace: [486475.682861] dump_stack (lib/dump_stack.c:52) [486475.683705] kasan_report_error (mm/kasan/report.c:132 mm/kasan/report.c:193) [486475.684777] __asan_report_load8_noabort (mm/kasan/report.c:251) [486475.685891] ? free_pages_and_swap_cache (mm/swap_state.c:265) [486475.687061] free_pages_and_swap_cache (mm/swap_state.c:265) [486475.688187] tlb_flush_mmu_free (mm/memory.c:256 (discriminator 4)) [486475.689365] tlb_finish_mmu (mm/memory.c:280) [486475.690840] exit_mmap (mm/mmap.c:2865) [486475.692441] ? SyS_remap_file_pages (mm/mmap.c:2827) [486475.694383] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486475.695780] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486475.697056] mmput (include/linux/compiler.h:207 kernel/fork.c:737 kernel/fork.c:704) [486475.698196] do_exit (./arch/x86/include/asm/bitops.h:311 include/linux/thread_info.h:91 kernel/exit.c:438 kernel/exit.c:733) [486475.699207] ? mm_update_next_owner (kernel/exit.c:654) [486475.700338] ? lockdep_init (kernel/locking/lockdep.c:3298) [486475.701425] ? lock_release (kernel/locking/lockdep.c:3644) [486475.702443] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486475.703981] do_group_exit (./arch/x86/include/asm/current.h:14 kernel/exit.c:859) [486475.704927] get_signal (kernel/signal.c:2353) [486475.705772] do_signal (arch/x86/kernel/signal.c:711) [486475.706595] ? do_readv_writev (include/linux/fsnotify.h:223 fs/read_write.c:821) [486475.707526] ? v9fs_file_lock_dotl (fs/9p/vfs_file.c:407) [486475.708573] ? vfs_write (fs/read_write.c:777) [486475.709447] ? setup_sigcontext (arch/x86/kernel/signal.c:708) [486475.710396] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486475.711624] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486475.712758] ? preempt_count_sub (kernel/sched/core.c:2852) [486475.713820] ? _raw_spin_unlock_irq (./arch/x86/include/asm/preempt.h:95 include/linux/spinlock_api_smp.h:171 kernel/locking/spinlock.c:199) [486475.714861] ? do_setitimer (kernel/time/itimer.c:239) [486475.715756] ? check_preemption_disabled (lib/smp_processor_id.c:18) [486475.716865] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486475.717950] prepare_exit_to_usermode (arch/x86/entry/common.c:282) [486475.719043] syscall_return_slowpath (arch/x86/entry/common.c:349) [486475.720035] int_ret_from_sys_call (arch/x86/entry/entry_64.S:282) [486475.721041] Memory state around the buggy address: [486475.721834] ffff8803c3a61f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.722992] ffff8803c3a61f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.724134] >ffff8803c3a62000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.725355] ^ [486475.726013] ffff8803c3a62080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.727099] ffff8803c3a62100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.728210] ================================================================== [486475.733496] ================================================================== [486475.734654] BUG: KASan: use after free in free_pages_and_swap_cache+0x17d/0x1a0 at addr ffff8803c3a62020 [486475.736177] Read of size 8 by task trinity-c218/7429 [486475.737202] page:ffffea000f0e9880 count:1 mapcount:0 mapping: (null) index:0x0 [486475.738476] flags: 0x22fffff80000000() [486475.739099] page dumped because: kasan: bad access detected [486475.739962] CPU: 5 PID: 7429 Comm: trinity-c218 Not tainted 4.2.0-rc5-next-20150806-sasha-00040-g1b47b00-dirty #2418 [486475.741643] dffffc0000000000 ffff880406b27778 ffffffffa1e89e54 ffff880406b27800 [486475.742972] ffff880406b277f0 ffffffff9877299e 0000000000000010 ffffed0000000000 [486475.744189] 0000000000000282 ffffed007874c403 66666620a1f110e2 6133633330383866 [486475.745517] Call Trace: [486475.746007] dump_stack (lib/dump_stack.c:52) [486475.746983] kasan_report_error (mm/kasan/report.c:132 mm/kasan/report.c:193) [486475.747993] __asan_report_load8_noabort (mm/kasan/report.c:251) [486475.749025] ? free_pages_and_swap_cache (mm/swap_state.c:265) [486475.750069] free_pages_and_swap_cache (mm/swap_state.c:265) [486475.751095] tlb_flush_mmu_free (mm/memory.c:256 (discriminator 4)) [486475.752073] tlb_finish_mmu (mm/memory.c:280) [486475.752912] exit_mmap (mm/mmap.c:2865) [486475.753715] ? SyS_remap_file_pages (mm/mmap.c:2827) [486475.754651] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486475.755597] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486475.756549] mmput (include/linux/compiler.h:207 kernel/fork.c:737 kernel/fork.c:704) [486475.757341] do_exit (./arch/x86/include/asm/bitops.h:311 include/linux/thread_info.h:91 kernel/exit.c:438 kernel/exit.c:733) [486475.758386] ? mm_update_next_owner (kernel/exit.c:654) [486475.760300] ? lockdep_init (kernel/locking/lockdep.c:3298) [486475.761970] ? lock_release (kernel/locking/lockdep.c:3644) [486475.763699] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486475.766164] do_group_exit (./arch/x86/include/asm/current.h:14 kernel/exit.c:859) [486475.767847] get_signal (kernel/signal.c:2353) [486475.769393] do_signal (arch/x86/kernel/signal.c:711) [486475.770306] ? do_readv_writev (include/linux/fsnotify.h:223 fs/read_write.c:821) [486475.771871] ? v9fs_file_lock_dotl (fs/9p/vfs_file.c:407) [486475.773646] ? vfs_write (fs/read_write.c:777) [486475.775339] ? setup_sigcontext (arch/x86/kernel/signal.c:708) [486475.777103] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486475.779505] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486475.780654] ? preempt_count_sub (kernel/sched/core.c:2852) [486475.781692] ? _raw_spin_unlock_irq (./arch/x86/include/asm/preempt.h:95 include/linux/spinlock_api_smp.h:171 kernel/locking/spinlock.c:199) [486475.783407] ? do_setitimer (kernel/time/itimer.c:239) [486475.784644] ? check_preemption_disabled (lib/smp_processor_id.c:18) [486475.785975] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486475.786978] prepare_exit_to_usermode (arch/x86/entry/common.c:282) [486475.787924] syscall_return_slowpath (arch/x86/entry/common.c:349) [486475.791314] int_ret_from_sys_call (arch/x86/entry/entry_64.S:282) [486475.792442] Memory state around the buggy address: [486475.793276] ffff8803c3a61f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.794359] ffff8803c3a61f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.795569] >ffff8803c3a62000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.797329] ^ [486475.798181] ffff8803c3a62080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.799900] ffff8803c3a62100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.801651] ================================================================== [486475.803572] ================================================================== [486475.804801] BUG: KASan: use after free in free_pages_and_swap_cache+0x17d/0x1a0 at addr ffff8803c3a62028 [486475.806866] Read of size 8 by task trinity-c218/7429 [486475.808305] page:ffffea000f0e9880 count:1 mapcount:0 mapping: (null) index:0x0 [486475.810323] flags: 0x22fffff80000000() [486475.811276] page dumped because: kasan: bad access detected [486475.812678] CPU: 5 PID: 7429 Comm: trinity-c218 Not tainted 4.2.0-rc5-next-20150806-sasha-00040-g1b47b00-dirty #2418 [486475.814973] dffffc0000000000 ffff880406b27778 ffffffffa1e89e54 ffff880406b27800 [486475.816527] ffff880406b277f0 ffffffff9877299e 0000000000000010 ffffed0000000000 [486475.818088] 0000000000000282 ffffed007874c404 66666620a1f110e2 6133633330383866 [486475.819606] Call Trace: [486475.820044] dump_stack (lib/dump_stack.c:52) [486475.820866] kasan_report_error (mm/kasan/report.c:132 mm/kasan/report.c:193) [486475.821880] __asan_report_load8_noabort (mm/kasan/report.c:251) [486475.822434] audit: type=1326 audit(7.030:417): auid=4294967295 uid=3067829327 gid=2901925822 ses=4294967295 pid=11247 comm="trinity-c84" exe="/trinity/trinity" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7fbd70916818 code=0x0 [486475.826094] ? free_pages_and_swap_cache (mm/swap_state.c:265) [486475.826948] free_pages_and_swap_cache (mm/swap_state.c:265) [486475.827780] tlb_flush_mmu_free (mm/memory.c:256 (discriminator 4)) [486475.828526] tlb_finish_mmu (mm/memory.c:280) [486475.829215] exit_mmap (mm/mmap.c:2865) [486475.829875] ? SyS_remap_file_pages (mm/mmap.c:2827) [486475.830672] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486475.831439] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486475.832209] mmput (include/linux/compiler.h:207 kernel/fork.c:737 kernel/fork.c:704) [486475.832822] do_exit (./arch/x86/include/asm/bitops.h:311 include/linux/thread_info.h:91 kernel/exit.c:438 kernel/exit.c:733) [486475.833525] ? mm_update_next_owner (kernel/exit.c:654) [486475.834364] ? lockdep_init (kernel/locking/lockdep.c:3298) [486475.835497] ? lock_release (kernel/locking/lockdep.c:3644) [486475.836363] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486475.837666] do_group_exit (./arch/x86/include/asm/current.h:14 kernel/exit.c:859) [486475.838518] get_signal (kernel/signal.c:2353) [486475.839527] do_signal (arch/x86/kernel/signal.c:711) [486475.839970] FAULT_INJECTION: forcing a failure. [486475.839970] name failslab, interval 50, probability 30, space 0, times -1 [486475.842025] ? do_readv_writev (include/linux/fsnotify.h:223 fs/read_write.c:821) [486475.842882] ? v9fs_file_lock_dotl (fs/9p/vfs_file.c:407) [486475.844128] ? vfs_write (fs/read_write.c:777) [486475.845446] ? setup_sigcontext (arch/x86/kernel/signal.c:708) [486475.846838] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486475.848693] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486475.850230] ? preempt_count_sub (kernel/sched/core.c:2852) [486475.851665] ? _raw_spin_unlock_irq (./arch/x86/include/asm/preempt.h:95 include/linux/spinlock_api_smp.h:171 kernel/locking/spinlock.c:199) [486475.853097] ? do_setitimer (kernel/time/itimer.c:239) [486475.854420] ? check_preemption_disabled (lib/smp_processor_id.c:18) [486475.855637] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486475.856720] prepare_exit_to_usermode (arch/x86/entry/common.c:282) [486475.857863] syscall_return_slowpath (arch/x86/entry/common.c:349) [486475.858953] int_ret_from_sys_call (arch/x86/entry/entry_64.S:282) [486475.859945] Memory state around the buggy address: [486475.860863] ffff8803c3a61f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.862096] ffff8803c3a61f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.863217] >ffff8803c3a62000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.864440] ^ [486475.865861] ffff8803c3a62080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.867322] ffff8803c3a62100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.868396] ================================================================== [486475.888839] ================================================================== [486475.889830] BUG: KASan: use after free in free_pages_and_swap_cache+0x17d/0x1a0 at addr ffff8803c3a62030 [486475.891008] Read of size 8 by task trinity-c218/7429 [486475.891674] page:ffffea000f0e9880 count:1 mapcount:0 mapping: (null) index:0x0 [486475.892688] flags: 0x22fffff80000000() [486475.893198] page dumped because: kasan: bad access detected [486475.893921] CPU: 5 PID: 7429 Comm: trinity-c218 Not tainted 4.2.0-rc5-next-20150806-sasha-00040-g1b47b00-dirty #2418 [486475.895402] dffffc0000000000 ffff880406b27778 ffffffffa1e89e54 ffff880406b27800 [486475.896764] ffff880406b277f0 ffffffff9877299e 0000000000000010 ffffed0000000000 [486475.898202] 0000000000000282 ffffed007874c405 66666620a1f110e2 6133633330383866 [486475.899592] Call Trace: [486475.899995] dump_stack (lib/dump_stack.c:52) [486475.900872] kasan_report_error (mm/kasan/report.c:132 mm/kasan/report.c:193) [486475.901785] __asan_report_load8_noabort (mm/kasan/report.c:251) [486475.902957] ? free_pages_and_swap_cache (mm/swap_state.c:265) [486475.904447] free_pages_and_swap_cache (mm/swap_state.c:265) [486475.905525] tlb_flush_mmu_free (mm/memory.c:256 (discriminator 4)) [486475.906393] tlb_finish_mmu (mm/memory.c:280) [486475.907230] exit_mmap (mm/mmap.c:2865) [486475.908024] ? SyS_remap_file_pages (mm/mmap.c:2827) [486475.909159] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486475.910303] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486475.911281] mmput (include/linux/compiler.h:207 kernel/fork.c:737 kernel/fork.c:704) [486475.912089] do_exit (./arch/x86/include/asm/bitops.h:311 include/linux/thread_info.h:91 kernel/exit.c:438 kernel/exit.c:733) [486475.912895] ? mm_update_next_owner (kernel/exit.c:654) [486475.913848] ? lockdep_init (kernel/locking/lockdep.c:3298) [486475.914782] ? lock_release (kernel/locking/lockdep.c:3644) [486475.915784] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486475.917287] do_group_exit (./arch/x86/include/asm/current.h:14 kernel/exit.c:859) [486475.918263] get_signal (kernel/signal.c:2353) [486475.919085] do_signal (arch/x86/kernel/signal.c:711) [486475.920007] ? do_readv_writev (include/linux/fsnotify.h:223 fs/read_write.c:821) [486475.920952] ? v9fs_file_lock_dotl (fs/9p/vfs_file.c:407) [486475.921840] ? vfs_write (fs/read_write.c:777) [486475.922567] ? setup_sigcontext (arch/x86/kernel/signal.c:708) [486475.923469] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486475.924591] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486475.925726] ? preempt_count_sub (kernel/sched/core.c:2852) [486475.926693] ? _raw_spin_unlock_irq (./arch/x86/include/asm/preempt.h:95 include/linux/spinlock_api_smp.h:171 kernel/locking/spinlock.c:199) [486475.927802] ? do_setitimer (kernel/time/itimer.c:239) [486475.928899] ? check_preemption_disabled (lib/smp_processor_id.c:18) [486475.929963] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486475.930968] prepare_exit_to_usermode (arch/x86/entry/common.c:282) [486475.931985] syscall_return_slowpath (arch/x86/entry/common.c:349) [486475.932932] int_ret_from_sys_call (arch/x86/entry/entry_64.S:282) [486475.933931] Memory state around the buggy address: [486475.934767] ffff8803c3a61f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.935851] ffff8803c3a61f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.936993] >ffff8803c3a62000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.938216] ^ [486475.938956] ffff8803c3a62080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.940053] ffff8803c3a62100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486475.941165] ================================================================== [486475.997632] ================================================================== [486475.998924] BUG: KASan: use after free in free_pages_and_swap_cache+0x17d/0x1a0 at addr ffff8803c3a62038 [486476.000443] Read of size 8 by task trinity-c218/7429 [486476.001768] page:ffffea000f0e9880 count:1 mapcount:0 mapping: (null) index:0x0 [486476.003032] flags: 0x22fffff80000000() [486476.003865] page dumped because: kasan: bad access detected [486476.004848] CPU: 5 PID: 7429 Comm: trinity-c218 Not tainted 4.2.0-rc5-next-20150806-sasha-00040-g1b47b00-dirty #2418 [486476.006915] dffffc0000000000 ffff880406b27778 ffffffffa1e89e54 ffff880406b27800 [486476.008185] ffff880406b277f0 ffffffff9877299e 0000000000000010 ffffed0000000000 [486476.009382] 0000000000000282 ffffed007874c406 66666620a1f110e2 6133633330383866 [486476.010634] Call Trace: [486476.011041] dump_stack (lib/dump_stack.c:52) [486476.011845] kasan_report_error (mm/kasan/report.c:132 mm/kasan/report.c:193) [486476.012950] __asan_report_load8_noabort (mm/kasan/report.c:251) [486476.014037] ? free_pages_and_swap_cache (mm/swap_state.c:265) [486476.015505] free_pages_and_swap_cache (mm/swap_state.c:265) [486476.016547] tlb_flush_mmu_free (mm/memory.c:256 (discriminator 4)) [486476.017599] tlb_finish_mmu (mm/memory.c:280) [486476.018684] exit_mmap (mm/mmap.c:2865) [486476.019559] ? SyS_remap_file_pages (mm/mmap.c:2827) [486476.020689] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486476.021683] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486476.022504] mmput (include/linux/compiler.h:207 kernel/fork.c:737 kernel/fork.c:704) [486476.023122] do_exit (./arch/x86/include/asm/bitops.h:311 include/linux/thread_info.h:91 kernel/exit.c:438 kernel/exit.c:733) [486476.023832] ? mm_update_next_owner (kernel/exit.c:654) [486476.024692] ? lockdep_init (kernel/locking/lockdep.c:3298) [486476.025394] ? lock_release (kernel/locking/lockdep.c:3644) [486476.026121] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486476.027113] do_group_exit (./arch/x86/include/asm/current.h:14 kernel/exit.c:859) [486476.027810] get_signal (kernel/signal.c:2353) [486476.028499] do_signal (arch/x86/kernel/signal.c:711) [486476.029163] ? do_readv_writev (include/linux/fsnotify.h:223 fs/read_write.c:821) [486476.029909] ? v9fs_file_lock_dotl (fs/9p/vfs_file.c:407) [486476.030698] ? vfs_write (fs/read_write.c:777) [486476.031384] ? setup_sigcontext (arch/x86/kernel/signal.c:708) [486476.032140] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486476.033140] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486476.034168] ? preempt_count_sub (kernel/sched/core.c:2852) [486476.034968] ? _raw_spin_unlock_irq (./arch/x86/include/asm/preempt.h:95 include/linux/spinlock_api_smp.h:171 kernel/locking/spinlock.c:199) [486476.035948] ? do_setitimer (kernel/time/itimer.c:239) [486476.036732] ? check_preemption_disabled (lib/smp_processor_id.c:18) [486476.037625] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486476.038501] prepare_exit_to_usermode (arch/x86/entry/common.c:282) [486476.039347] syscall_return_slowpath (arch/x86/entry/common.c:349) [486476.040226] int_ret_from_sys_call (arch/x86/entry/entry_64.S:282) [486476.041030] Memory state around the buggy address: [486476.041682] ffff8803c3a61f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.042612] ffff8803c3a61f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.043503] >ffff8803c3a62000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.044476] ^ [486476.045313] ffff8803c3a62080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.046515] ffff8803c3a62100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.047576] ================================================================== [486476.104666] ================================================================== [486476.105798] BUG: KASan: use after free in free_pages_and_swap_cache+0x17d/0x1a0 at addr ffff8803c3a62040 [486476.107316] Read of size 8 by task trinity-c218/7429 [486476.108230] page:ffffea000f0e9880 count:1 mapcount:0 mapping: (null) index:0x0 [486476.109479] flags: 0x22fffff80000000() [486476.110165] page dumped because: kasan: bad access detected [486476.110961] CPU: 5 PID: 7429 Comm: trinity-c218 Not tainted 4.2.0-rc5-next-20150806-sasha-00040-g1b47b00-dirty #2418 [486476.112354] dffffc0000000000 ffff880406b27778 ffffffffa1e89e54 ffff880406b27800 [486476.113519] ffff880406b277f0 ffffffff9877299e 0000000000000010 ffffed0000000000 [486476.114576] 0000000000000282 ffffed007874c407 66666620a1f110e2 6133633330383866 [486476.115959] Call Trace: [486476.116423] dump_stack (lib/dump_stack.c:52) [486476.117306] kasan_report_error (mm/kasan/report.c:132 mm/kasan/report.c:193) [486476.118525] __asan_report_load8_noabort (mm/kasan/report.c:251) [486476.119547] ? free_pages_and_swap_cache (mm/swap_state.c:265) [486476.120635] free_pages_and_swap_cache (mm/swap_state.c:265) [486476.121807] tlb_flush_mmu_free (mm/memory.c:256 (discriminator 4)) [486476.122759] tlb_finish_mmu (mm/memory.c:280) [486476.123803] exit_mmap (mm/mmap.c:2865) [486476.124622] ? SyS_remap_file_pages (mm/mmap.c:2827) [486476.125444] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486476.126216] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486476.126988] mmput (include/linux/compiler.h:207 kernel/fork.c:737 kernel/fork.c:704) [486476.127614] do_exit (./arch/x86/include/asm/bitops.h:311 include/linux/thread_info.h:91 kernel/exit.c:438 kernel/exit.c:733) [486476.128334] ? mm_update_next_owner (kernel/exit.c:654) [486476.129177] ? lockdep_init (kernel/locking/lockdep.c:3298) [486476.129972] ? lock_release (kernel/locking/lockdep.c:3644) [486476.130748] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486476.131793] do_group_exit (./arch/x86/include/asm/current.h:14 kernel/exit.c:859) [486476.132511] get_signal (kernel/signal.c:2353) [486476.133202] do_signal (arch/x86/kernel/signal.c:711) [486476.133899] ? do_readv_writev (include/linux/fsnotify.h:223 fs/read_write.c:821) [486476.134906] ? v9fs_file_lock_dotl (fs/9p/vfs_file.c:407) [486476.136216] ? vfs_write (fs/read_write.c:777) [486476.137225] ? setup_sigcontext (arch/x86/kernel/signal.c:708) [486476.138227] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486476.139509] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486476.140549] ? preempt_count_sub (kernel/sched/core.c:2852) [486476.141684] ? _raw_spin_unlock_irq (./arch/x86/include/asm/preempt.h:95 include/linux/spinlock_api_smp.h:171 kernel/locking/spinlock.c:199) [486476.142674] ? do_setitimer (kernel/time/itimer.c:239) [486476.143767] ? check_preemption_disabled (lib/smp_processor_id.c:18) [486476.144835] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486476.146086] prepare_exit_to_usermode (arch/x86/entry/common.c:282) [486476.147129] syscall_return_slowpath (arch/x86/entry/common.c:349) [486476.148132] int_ret_from_sys_call (arch/x86/entry/entry_64.S:282) [486476.149031] Memory state around the buggy address: [486476.149755] ffff8803c3a61f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.150806] ffff8803c3a61f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.151864] >ffff8803c3a62000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.152954] ^ [486476.153826] ffff8803c3a62080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.155014] ffff8803c3a62100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.156254] ================================================================== [486476.215515] ================================================================== [486476.217578] BUG: KASan: use after free in free_pages_and_swap_cache+0x17d/0x1a0 at addr ffff8803c3a62048 [486476.220360] Read of size 8 by task trinity-c218/7429 [486476.221560] page:ffffea000f0e9880 count:1 mapcount:0 mapping: (null) index:0x0 [486476.223076] flags: 0x22fffff80000000() [486476.224067] page dumped because: kasan: bad access detected [486476.225064] CPU: 5 PID: 7429 Comm: trinity-c218 Not tainted 4.2.0-rc5-next-20150806-sasha-00040-g1b47b00-dirty #2418 [486476.226393] dffffc0000000000 ffff880406b27778 ffffffffa1e89e54 ffff880406b27800 [486476.227400] ffff880406b277f0 ffffffff9877299e 0000000000000010 ffffed0000000000 [486476.228430] 0000000000000282 ffffed007874c408 66666620a1f110e2 6133633330383866 [486476.229433] Call Trace: [486476.229839] dump_stack (lib/dump_stack.c:52) [486476.230525] kasan_report_error (mm/kasan/report.c:132 mm/kasan/report.c:193) [486476.231312] __asan_report_load8_noabort (mm/kasan/report.c:251) [486476.232154] ? free_pages_and_swap_cache (mm/swap_state.c:265) [486476.233019] free_pages_and_swap_cache (mm/swap_state.c:265) [486476.234040] tlb_flush_mmu_free (mm/memory.c:256 (discriminator 4)) [486476.234814] tlb_finish_mmu (mm/memory.c:280) [486476.235294] exit_mmap (mm/mmap.c:2865) [486476.235745] ? SyS_remap_file_pages (mm/mmap.c:2827) [486476.236280] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486476.236804] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486476.237634] mmput (include/linux/compiler.h:207 kernel/fork.c:737 kernel/fork.c:704) [486476.238173] do_exit (./arch/x86/include/asm/bitops.h:311 include/linux/thread_info.h:91 kernel/exit.c:438 kernel/exit.c:733) [486476.238836] ? mm_update_next_owner (kernel/exit.c:654) [486476.239666] ? lockdep_init (kernel/locking/lockdep.c:3298) [486476.240427] ? lock_release (kernel/locking/lockdep.c:3644) [486476.241243] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486476.242133] do_group_exit (./arch/x86/include/asm/current.h:14 kernel/exit.c:859) [486476.242730] get_signal (kernel/signal.c:2353) [486476.243393] do_signal (arch/x86/kernel/signal.c:711) [486476.243959] ? do_readv_writev (include/linux/fsnotify.h:223 fs/read_write.c:821) [486476.244627] ? v9fs_file_lock_dotl (fs/9p/vfs_file.c:407) [486476.245315] ? vfs_write (fs/read_write.c:777) [486476.245902] ? setup_sigcontext (arch/x86/kernel/signal.c:708) [486476.246548] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486476.247395] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486476.248000] FAULT_INJECTION: forcing a failure. [486476.248000] name failslab, interval 50, probability 30, space 0, times -1 [486476.249267] ? preempt_count_sub (kernel/sched/core.c:2852) [486476.249924] ? _raw_spin_unlock_irq (./arch/x86/include/asm/preempt.h:95 include/linux/spinlock_api_smp.h:171 kernel/locking/spinlock.c:199) [486476.250583] ? do_setitimer (kernel/time/itimer.c:239) [486476.251190] ? check_preemption_disabled (lib/smp_processor_id.c:18) [486476.251901] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486476.252596] prepare_exit_to_usermode (arch/x86/entry/common.c:282) [486476.253284] syscall_return_slowpath (arch/x86/entry/common.c:349) [486476.253966] int_ret_from_sys_call (arch/x86/entry/entry_64.S:282) [486476.254637] Memory state around the buggy address: [486476.255156] ffff8803c3a61f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.255934] ffff8803c3a61f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.256693] >ffff8803c3a62000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.257450] ^ [486476.258044] ffff8803c3a62080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.258803] ffff8803c3a62100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.259562] ================================================================== [486476.261376] ================================================================== [486476.262308] BUG: KASan: use after free in free_pages_and_swap_cache+0x17d/0x1a0 at addr ffff8803c3a62050 [486476.263540] Read of size 8 by task trinity-c218/7429 [486476.264189] page:ffffea000f0e9880 count:1 mapcount:0 mapping: (null) index:0x0 [486476.265569] flags: 0x22fffff80000000() [486476.266095] page dumped because: kasan: bad access detected [486476.266834] CPU: 5 PID: 7429 Comm: trinity-c218 Not tainted 4.2.0-rc5-next-20150806-sasha-00040-g1b47b00-dirty #2418 [486476.267813] dffffc0000000000 ffff880406b27778 ffffffffa1e89e54[486476.268552] FAULT_INJECTION: forcing a failure. [486476.268552] name failslab, interval 50, probability 30, space 0, times -1 [486476.269940] ffff880406b27800 [486476.270439] ffff880406b277f0 ffffffff9877299e 0000000000000010 ffffed0000000000 [486476.271528] 0000000000000282 ffffed007874c409 66666620a1f110e2 6133633330383866 [486476.272569] Call Trace: [486476.272912] dump_stack (lib/dump_stack.c:52) [486476.273559] kasan_report_error (mm/kasan/report.c:132 mm/kasan/report.c:193) [486476.274356] __asan_report_load8_noabort (mm/kasan/report.c:251) [486476.275180] ? free_pages_and_swap_cache (mm/swap_state.c:265) [486476.275936] free_pages_and_swap_cache (mm/swap_state.c:265) [486476.276684] tlb_flush_mmu_free (mm/memory.c:256 (discriminator 4)) [486476.277346] tlb_finish_mmu (mm/memory.c:280) [486476.277961] exit_mmap (mm/mmap.c:2865) [486476.278549] ? SyS_remap_file_pages (mm/mmap.c:2827) [486476.279259] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486476.279940] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486476.280619] mmput (include/linux/compiler.h:207 kernel/fork.c:737 kernel/fork.c:704) [486476.281160] do_exit (./arch/x86/include/asm/bitops.h:311 include/linux/thread_info.h:91 kernel/exit.c:438 kernel/exit.c:733) [486476.281742] ? mm_update_next_owner (kernel/exit.c:654) [486476.282451] ? lockdep_init (kernel/locking/lockdep.c:3298) [486476.283064] ? lock_release (kernel/locking/lockdep.c:3644) [486476.283707] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486476.284615] do_group_exit (./arch/x86/include/asm/current.h:14 kernel/exit.c:859) [486476.285228] get_signal (kernel/signal.c:2353) [486476.285842] do_signal (arch/x86/kernel/signal.c:711) [486476.286433] ? do_readv_writev (include/linux/fsnotify.h:223 fs/read_write.c:821) [486476.287099] ? v9fs_file_lock_dotl (fs/9p/vfs_file.c:407) [486476.287789] ? vfs_write (fs/read_write.c:777) [486476.288390] ? setup_sigcontext (arch/x86/kernel/signal.c:708) [486476.289056] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486476.289935] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486476.290657] ? preempt_count_sub (kernel/sched/core.c:2852) [486476.291332] ? _raw_spin_unlock_irq (./arch/x86/include/asm/preempt.h:95 include/linux/spinlock_api_smp.h:171 kernel/locking/spinlock.c:199) [486476.292016] ? do_setitimer (kernel/time/itimer.c:239) [486476.292643] ? check_preemption_disabled (lib/smp_processor_id.c:18) [486476.293382] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486476.294101] prepare_exit_to_usermode (arch/x86/entry/common.c:282) [486476.294831] syscall_return_slowpath (arch/x86/entry/common.c:349) [486476.295544] int_ret_from_sys_call (arch/x86/entry/entry_64.S:282) [486476.296220] Memory state around the buggy address: [486476.296759] ffff8803c3a61f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.297554] ffff8803c3a61f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.298349] >ffff8803c3a62000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.299145] ^ [486476.299796] ffff8803c3a62080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.300591] ffff8803c3a62100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.301384] ================================================================== [486476.302475] ================================================================== [486476.303278] BUG: KASan: use after free in free_pages_and_swap_cache+0x17d/0x1a0 at addr ffff8803c3a62058 [486476.304301] Read of size 8 by task trinity-c218/7429 [486476.304889] page:ffffea000f0e9880 count:1 mapcount:0 mapping: (null) index:0x0 [486476.305387] FAULT_INJECTION: forcing a failure. [486476.305387] name failslab, interval 50, probability 30, space 0, times -1 [486476.306956] flags: 0x22fffff80000000() [486476.307394] page dumped because: kasan: bad access detected [486476.308005] CPU: 5 PID: 7429 Comm: trinity-c218 Not tainted 4.2.0-rc5-next-20150806-sasha-00040-g1b47b00-dirty #2418 [486476.309122] dffffc0000000000 ffff880406b27778 ffffffffa1e89e54 ffff880406b27800 [486476.310005] ffff880406b277f0 ffffffff9877299e 0000000000000010 ffffed0000000000 [486476.310890] 0000000000000282 ffffed007874c40a 66666620a1f110e2 6133633330383866 [486476.311774] Call Trace: [486476.312068] dump_stack (lib/dump_stack.c:52) [486476.312634] kasan_report_error (mm/kasan/report.c:132 mm/kasan/report.c:193) [486476.313286] __asan_report_load8_noabort (mm/kasan/report.c:251) [486476.313826] FAULT_INJECTION: forcing a failure. [486476.313826] name failslab, interval 50, probability 30, space 0, times -1 [486476.315293] ? free_pages_and_swap_cache (mm/swap_state.c:265) [486476.316040] free_pages_and_swap_cache (mm/swap_state.c:265) [486476.316764] tlb_flush_mmu_free (mm/memory.c:256 (discriminator 4)) [486476.317414] tlb_finish_mmu (mm/memory.c:280) [486476.318019] exit_mmap (mm/mmap.c:2865) [486476.318599] ? SyS_remap_file_pages (mm/mmap.c:2827) [486476.319299] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486476.319973] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486476.320646] mmput (include/linux/compiler.h:207 kernel/fork.c:737 kernel/fork.c:704) [486476.321182] do_exit (./arch/x86/include/asm/bitops.h:311 include/linux/thread_info.h:91 kernel/exit.c:438 kernel/exit.c:733) [486476.321755] ? mm_update_next_owner (kernel/exit.c:654) [486476.322454] ? lockdep_init (kernel/locking/lockdep.c:3298) [486476.323063] ? lock_release (kernel/locking/lockdep.c:3644) [486476.323700] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486476.324581] do_group_exit (./arch/x86/include/asm/current.h:14 kernel/exit.c:859) [486476.325209] get_signal (kernel/signal.c:2353) [486476.325785] do_signal (arch/x86/kernel/signal.c:711) [486476.326232] ? do_readv_writev (include/linux/fsnotify.h:223 fs/read_write.c:821) [486476.326823] ? v9fs_file_lock_dotl (fs/9p/vfs_file.c:407) [486476.327355] ? vfs_write (fs/read_write.c:777) [486476.327817] ? setup_sigcontext (arch/x86/kernel/signal.c:708) [486476.328325] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486476.328995] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486476.329546] ? preempt_count_sub (kernel/sched/core.c:2852) [486476.330145] ? _raw_spin_unlock_irq (./arch/x86/include/asm/preempt.h:95 include/linux/spinlock_api_smp.h:171 kernel/locking/spinlock.c:199) [486476.330670] ? do_setitimer (kernel/time/itimer.c:239) [486476.331150] ? check_preemption_disabled (lib/smp_processor_id.c:18) [486476.331712] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486476.332340] prepare_exit_to_usermode (arch/x86/entry/common.c:282) [486476.332916] syscall_return_slowpath (arch/x86/entry/common.c:349) [486476.333506] int_ret_from_sys_call (arch/x86/entry/entry_64.S:282) [486476.334233] Memory state around the buggy address: [486476.334836] ffff8803c3a61f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.335530] ffff8803c3a61f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.336148] >ffff8803c3a62000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.336802] ^ [486476.337336] ffff8803c3a62080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.337969] ffff8803c3a62100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.338574] ================================================================== [486476.339259] ================================================================== [486476.339866] BUG: KASan: use after free in free_pages_and_swap_cache+0x17d/0x1a0 at addr ffff8803c3a62060 [486476.340638] Read of size 8 by task trinity-c218/7429 [486476.341055] page:ffffea000f0e9880 count:1 mapcount:0 mapping: (null) index:0x0 [486476.341795] flags: 0x22fffff80000000() [486476.342132] page dumped because: kasan: bad access detected [486476.342598] CPU: 5 PID: 7429 Comm: trinity-c218 Not tainted 4.2.0-rc5-next-20150806-sasha-00040-g1b47b00-dirty #2418 [486476.343473] dffffc0000000000 ffff880406b27778 ffffffffa1e89e54 ffff880406b27800 [486476.344144] ffff880406b277f0 ffffffff9877299e 0000000000000010 ffffed0000000000 [486476.344858] 0000000000000282 ffffed007874c40b 66666620a1f110e2 6133633330383866 [486476.345533] Call Trace: [486476.345757] dump_stack (lib/dump_stack.c:52) [486476.346256] kasan_report_error (mm/kasan/report.c:132 mm/kasan/report.c:193) [486476.346869] __asan_report_load8_noabort (mm/kasan/report.c:251) [486476.347419] ? free_pages_and_swap_cache (mm/swap_state.c:265) [486476.348051] free_pages_and_swap_cache (mm/swap_state.c:265) [486476.348885] tlb_flush_mmu_free (mm/memory.c:256 (discriminator 4)) [486476.349597] tlb_finish_mmu (mm/memory.c:280) [486476.350318] exit_mmap (mm/mmap.c:2865) [486476.351035] ? SyS_remap_file_pages (mm/mmap.c:2827) [486476.351889] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486476.352708] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486476.353520] mmput (include/linux/compiler.h:207 kernel/fork.c:737 kernel/fork.c:704) [486476.354174] do_exit (./arch/x86/include/asm/bitops.h:311 include/linux/thread_info.h:91 kernel/exit.c:438 kernel/exit.c:733) [486476.354686] FAULT_INJECTION: forcing a failure. [486476.354686] name failslab, interval 50, probability 30, space 0, times -1 [486476.356376] ? mm_update_next_owner (kernel/exit.c:654) [486476.357234] ? lockdep_init (kernel/locking/lockdep.c:3298) [486476.357976] ? lock_release (kernel/locking/lockdep.c:3644) [486476.358755] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486476.359820] do_group_exit (./arch/x86/include/asm/current.h:14 kernel/exit.c:859) [486476.360570] get_signal (kernel/signal.c:2353) [486476.361303] do_signal (arch/x86/kernel/signal.c:711) [486476.362014] ? do_readv_writev (include/linux/fsnotify.h:223 fs/read_write.c:821) [486476.362811] ? v9fs_file_lock_dotl (fs/9p/vfs_file.c:407) [486476.363649] ? vfs_write (fs/read_write.c:777) [486476.364373] ? setup_sigcontext (arch/x86/kernel/signal.c:708) [486476.365193] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486476.366242] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486476.367115] ? preempt_count_sub (kernel/sched/core.c:2852) [486476.367877] ? _raw_spin_unlock_irq (./arch/x86/include/asm/preempt.h:95 include/linux/spinlock_api_smp.h:171 kernel/locking/spinlock.c:199) [486476.368787] ? do_setitimer (kernel/time/itimer.c:239) [486476.369541] ? check_preemption_disabled (lib/smp_processor_id.c:18) [486476.370432] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486476.371234] prepare_exit_to_usermode (arch/x86/entry/common.c:282) [486476.372071] syscall_return_slowpath (arch/x86/entry/common.c:349) [486476.372932] int_ret_from_sys_call (arch/x86/entry/entry_64.S:282) [486476.373747] Memory state around the buggy address: [486476.374393] ffff8803c3a61f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.375371] ffff8803c3a61f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.376265] >ffff8803c3a62000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.377032] ^ [486476.377820] ffff8803c3a62080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.378760] ffff8803c3a62100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.379642] ================================================================== [486476.380553] ================================================================== [486476.381406] BUG: KASan: use after free in free_pages_and_swap_cache+0x17d/0x1a0 at addr ffff8803c3a62068 [486476.382186] Read of size 8 by task trinity-c218/7429 [486476.382613] page:ffffea000f0e9880 count:1 mapcount:0 mapping: (null) index:0x0 [486476.383350] flags: 0x22fffff80000000() [486476.383691] page dumped because: kasan: bad access detected [486476.384159] CPU: 5 PID: 7429 Comm: trinity-c218 Not tainted 4.2.0-rc5-next-20150806-sasha-00040-g1b47b00-dirty #2418 [486476.385175] dffffc0000000000 ffff880406b27778 ffffffffa1e89e54 ffff880406b27800 [486476.386157] ffff880406b277f0 ffffffff9877299e 0000000000000010 ffffed0000000000 [486476.387069] 0000000000000282 ffffed007874c40c 66666620a1f110e2 6133633330383866 [486476.388073] Call Trace: [486476.388329] FAULT_INJECTION: forcing a failure. [486476.388329] name failslab, interval 50, probability 30, space 0, times -1 [486476.389770] dump_stack (lib/dump_stack.c:52) [486476.390478] kasan_report_error (mm/kasan/report.c:132 mm/kasan/report.c:193) [486476.391242] __asan_report_load8_noabort (mm/kasan/report.c:251) [486476.392123] ? free_pages_and_swap_cache (mm/swap_state.c:265) [486476.393029] free_pages_and_swap_cache (mm/swap_state.c:265) [486476.393908] tlb_flush_mmu_free (mm/memory.c:256 (discriminator 4)) [486476.394831] tlb_finish_mmu (mm/memory.c:280) [486476.395566] exit_mmap (mm/mmap.c:2865) [486476.396225] ? SyS_remap_file_pages (mm/mmap.c:2827) [486476.397071] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486476.397857] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486476.398670] mmput (include/linux/compiler.h:207 kernel/fork.c:737 kernel/fork.c:704) [486476.399321] do_exit (./arch/x86/include/asm/bitops.h:311 include/linux/thread_info.h:91 kernel/exit.c:438 kernel/exit.c:733) [486476.400017] ? mm_update_next_owner (kernel/exit.c:654) [486476.400886] ? lockdep_init (kernel/locking/lockdep.c:3298) [486476.401629] ? lock_release (kernel/locking/lockdep.c:3644) [486476.402398] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486476.403681] do_group_exit (./arch/x86/include/asm/current.h:14 kernel/exit.c:859) [486476.404364] get_signal (kernel/signal.c:2353) [486476.405238] do_signal (arch/x86/kernel/signal.c:711) [486476.406040] ? do_readv_writev (include/linux/fsnotify.h:223 fs/read_write.c:821) [486476.406300] FAULT_INJECTION: forcing a failure. [486476.406300] name failslab, interval 50, probability 30, space 0, times -1 [486476.408278] ? v9fs_file_lock_dotl (fs/9p/vfs_file.c:407) [486476.409060] ? vfs_write (fs/read_write.c:777) [486476.409985] ? setup_sigcontext (arch/x86/kernel/signal.c:708) [486476.410741] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486476.411978] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486476.412800] ? preempt_count_sub (kernel/sched/core.c:2852) [486476.413553] ? _raw_spin_unlock_irq (./arch/x86/include/asm/preempt.h:95 include/linux/spinlock_api_smp.h:171 kernel/locking/spinlock.c:199) [486476.413727] FAULT_INJECTION: forcing a failure. [486476.413727] name failslab, interval 50, probability 30, space 0, times -1 [486476.416007] ? do_setitimer (kernel/time/itimer.c:239) [486476.416658] ? check_preemption_disabled (lib/smp_processor_id.c:18) [486476.417521] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486476.418372] prepare_exit_to_usermode (arch/x86/entry/common.c:282) [486476.419207] syscall_return_slowpath (arch/x86/entry/common.c:349) [486476.420020] int_ret_from_sys_call (arch/x86/entry/entry_64.S:282) [486476.420783] Memory state around the buggy address: [486476.421386] ffff8803c3a61f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.422271] ffff8803c3a61f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.423162] >ffff8803c3a62000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.423442] FAULT_INJECTION: forcing a failure. [486476.423442] name failslab, interval 50, probability 30, space 0, times -1 [486476.425568] ^ [486476.426400] ffff8803c3a62080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.427309] ffff8803c3a62100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.428173] ================================================================== [486476.428311] FAULT_INJECTION: forcing a failure. [486476.428311] name failslab, interval 50, probability 30, space 0, times -1 [486476.430647] ================================================================== [486476.431581] BUG: KASan: use after free in free_pages_and_swap_cache+0x17d/0x1a0 at addr ffff8803c3a62070 [486476.432796] Read of size 8 by task trinity-c218/7429 [486476.433450] page:ffffea000f0e9880 count:1 mapcount:0 mapping: (null) index:0x0 [486476.434519] flags: 0x22fffff80000000() [486476.435056] page dumped because: kasan: bad access detected [486476.435809] CPU: 5 PID: 7429 Comm: trinity-c218 Not tainted 4.2.0-rc5-next-20150806-sasha-00040-g1b47b00-dirty #2418 [486476.437152] dffffc0000000000 ffff880406b27778 ffffffffa1e89e54 ffff880406b27800 [486476.438222] ffff880406b277f0 ffffffff9877299e 0000000000000010 ffffed0000000000 [486476.439295] 0000000000000282 ffffed007874c40d 66666620a1f110e2 6133633330383866 [486476.440374] Call Trace: [486476.440733] dump_stack (lib/dump_stack.c:52) [486476.441438] kasan_report_error (mm/kasan/report.c:132 mm/kasan/report.c:193) [486476.442233] __asan_report_load8_noabort (mm/kasan/report.c:251) [486476.443067] ? free_pages_and_swap_cache (mm/swap_state.c:265) [486476.444024] free_pages_and_swap_cache (mm/swap_state.c:265) [486476.445027] tlb_flush_mmu_free (mm/memory.c:256 (discriminator 4)) [486476.445822] tlb_finish_mmu (mm/memory.c:280) [486476.446624] exit_mmap (mm/mmap.c:2865) [486476.447267] ? SyS_remap_file_pages (mm/mmap.c:2827) [486476.448090] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486476.448906] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486476.449712] mmput (include/linux/compiler.h:207 kernel/fork.c:737 kernel/fork.c:704) [486476.450331] do_exit (./arch/x86/include/asm/bitops.h:311 include/linux/thread_info.h:91 kernel/exit.c:438 kernel/exit.c:733) [486476.451018] ? mm_update_next_owner (kernel/exit.c:654) [486476.451858] ? lockdep_init (kernel/locking/lockdep.c:3298) [486476.452589] ? lock_release (kernel/locking/lockdep.c:3644) [486476.453355] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486476.454405] do_group_exit (./arch/x86/include/asm/current.h:14 kernel/exit.c:859) [486476.455173] get_signal (kernel/signal.c:2353) [486476.455894] do_signal (arch/x86/kernel/signal.c:711) [486476.456588] ? do_readv_writev (include/linux/fsnotify.h:223 fs/read_write.c:821) [486476.457379] ? v9fs_file_lock_dotl (fs/9p/vfs_file.c:407) [486476.458182] ? vfs_write (fs/read_write.c:777) [486476.458948] ? setup_sigcontext (arch/x86/kernel/signal.c:708) [486476.459836] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486476.461001] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486476.462059] ? preempt_count_sub (kernel/sched/core.c:2852) [486476.463068] ? _raw_spin_unlock_irq (./arch/x86/include/asm/preempt.h:95 include/linux/spinlock_api_smp.h:171 kernel/locking/spinlock.c:199) [486476.463932] ? do_setitimer (kernel/time/itimer.c:239) [486476.464753] ? check_preemption_disabled (lib/smp_processor_id.c:18) [486476.465632] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486476.466503] prepare_exit_to_usermode (arch/x86/entry/common.c:282) [486476.467370] syscall_return_slowpath (arch/x86/entry/common.c:349) [486476.468222] int_ret_from_sys_call (arch/x86/entry/entry_64.S:282) [486476.469029] Memory state around the buggy address: [486476.469675] ffff8803c3a61f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.470615] ffff8803c3a61f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.471557] >ffff8803c3a62000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.472496] ^ [486476.473398] ffff8803c3a62080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.474336] ffff8803c3a62100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.475301] ================================================================== [486476.477819] ================================================================== [486476.478757] BUG: KASan: use after free in free_pages_and_swap_cache+0x17d/0x1a0 at addr ffff8803c3a62078 [486476.480002] Read of size 8 by task trinity-c218/7429 [486476.480662] page:ffffea000f0e9880 count:1 mapcount:0 mapping: (null) index:0x0 [486476.481719] flags: 0x22fffff80000000() [486476.482263] page dumped because: kasan: bad access detected [486476.483013] CPU: 5 PID: 7429 Comm: trinity-c218 Not tainted 4.2.0-rc5-next-20150806-sasha-00040-g1b47b00-dirty #2418 [486476.484373] dffffc0000000000 ffff880406b27778 ffffffffa1e89e54 ffff880406b27800 [486476.485508] ffff880406b277f0 ffffffff9877299e 0000000000000010 ffffed0000000000 [486476.486598] 0000000000000282 ffffed007874c40e 66666620a1f110e2 6133633330383866 [486476.487700] Call Trace: [486476.488056] dump_stack (lib/dump_stack.c:52) [486476.488768] kasan_report_error (mm/kasan/report.c:132 mm/kasan/report.c:193) [486476.489577] __asan_report_load8_noabort (mm/kasan/report.c:251) [486476.490441] ? free_pages_and_swap_cache (mm/swap_state.c:265) [486476.491357] free_pages_and_swap_cache (mm/swap_state.c:265) [486476.492232] tlb_flush_mmu_free (mm/memory.c:256 (discriminator 4)) [486476.493032] tlb_finish_mmu (mm/memory.c:280) [486476.493775] exit_mmap (mm/mmap.c:2865) [486476.494496] ? SyS_remap_file_pages (mm/mmap.c:2827) [486476.495344] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486476.496168] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486476.497003] mmput (include/linux/compiler.h:207 kernel/fork.c:737 kernel/fork.c:704) [486476.497654] do_exit (./arch/x86/include/asm/bitops.h:311 include/linux/thread_info.h:91 kernel/exit.c:438 kernel/exit.c:733) [486476.498353] ? mm_update_next_owner (kernel/exit.c:654) [486476.499223] ? lockdep_init (kernel/locking/lockdep.c:3298) [486476.499973] ? lock_release (kernel/locking/lockdep.c:3644) [486476.500432] FAULT_INJECTION: forcing a failure. [486476.500432] name failslab, interval 50, probability 30, space 0, times -1 [486476.502250] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486476.503310] do_group_exit (./arch/x86/include/asm/current.h:14 kernel/exit.c:859) [486476.504142] get_signal (kernel/signal.c:2353) [486476.504966] do_signal (arch/x86/kernel/signal.c:711) [486476.505733] ? do_readv_writev (include/linux/fsnotify.h:223 fs/read_write.c:821) [486476.506615] ? v9fs_file_lock_dotl (fs/9p/vfs_file.c:407) [486476.507564] ? vfs_write (fs/read_write.c:777) [486476.508300] ? setup_sigcontext (arch/x86/kernel/signal.c:708) [486476.509062] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486476.510136] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486476.510987] ? preempt_count_sub (kernel/sched/core.c:2852) [486476.511789] ? _raw_spin_unlock_irq (./arch/x86/include/asm/preempt.h:95 include/linux/spinlock_api_smp.h:171 kernel/locking/spinlock.c:199) [486476.512628] ? do_setitimer (kernel/time/itimer.c:239) [486476.513377] ? check_preemption_disabled (lib/smp_processor_id.c:18) [486476.514243] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486476.515202] prepare_exit_to_usermode (arch/x86/entry/common.c:282) [486476.516024] syscall_return_slowpath (arch/x86/entry/common.c:349) [486476.516883] int_ret_from_sys_call (arch/x86/entry/entry_64.S:282) [486476.517695] Memory state around the buggy address: [486476.518346] ffff8803c3a61f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.519279] ffff8803c3a61f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.520213] >ffff8803c3a62000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.521162] ^ [486476.522104] ffff8803c3a62080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.523063] ffff8803c3a62100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [486476.524007] ================================================================== [486476.525088] ================================================================== [486476.526040] BUG: KASan: use after free in free_pages_and_swap_cache+0x17d/0x1a0 at addr ffff8803c3a62080 [486476.527275] Read of size 8 by task trinity-c218/7429 [486476.527971] page:ffffea000f0e9880 count:1 mapcount:0 mapping: (null) index:0x0 [486476.529029] flags: 0x22fffff80000000() [486476.529571] page dumped because: kasan: bad access detected [486476.530325] CPU: 5 PID: 7429 Comm: trinity-c218 Not tainted 4.2.0-rc5-next-20150806-sasha-00040-g1b47b00-dirty #2418 [486476.531715] dffffc0000000000 ffff880406b27778 ffffffffa1e89e54 ffff880406b27800 [486476.532804] ffff880406b277f0 ffffffff9877299e 0000000000000010 ffffed0000000000 [486476.533888] 0000000000000282 ffffed007874c40f 66666620a1f110e2 6133633330383866 [486476.534984] Call Trace: [486476.535344] dump_stack (lib/dump_stack.c:52) [486476.536024] kasan_report_error (mm/kasan/report.c:132 mm/kasan/report.c:193) [486476.536836] __asan_report_load8_noabort (mm/kasan/report.c:251) [486476.537728] ? free_pages_and_swap_cache (mm/swap_state.c:265) [486476.538649] free_pages_and_swap_cache (mm/swap_state.c:265) [486476.539544] tlb_flush_mmu_free (mm/memory.c:256 (discriminator 4)) [486476.540335] tlb_finish_mmu (mm/memory.c:280) [486476.541068] exit_mmap (mm/mmap.c:2865) [486476.541764] ? SyS_remap_file_pages (mm/mmap.c:2827) [486476.542620] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486476.543381] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486476.544204] mmput (include/linux/compiler.h:207 kernel/fork.c:737 kernel/fork.c:704) [486476.544819] do_exit (./arch/x86/include/asm/bitops.h:311 include/linux/thread_info.h:91 kernel/exit.c:438 kernel/exit.c:733) [486476.545450] ? mm_update_next_owner (kernel/exit.c:654) [486476.546200] ? lockdep_init (kernel/locking/lockdep.c:3298) [486476.546854] ? lock_release (kernel/locking/lockdep.c:3644) [486476.547538] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486476.548475] do_group_exit (./arch/x86/include/asm/current.h:14 kernel/exit.c:859) [486476.549138] get_signal (kernel/signal.c:2353) [486476.549791] do_signal (arch/x86/kernel/signal.c:711) [486476.550596] ? do_readv_writev (include/linux/fsnotify.h:223 fs/read_write.c:821) [486476.551550] ? v9fs_file_lock_dotl (fs/9p/vfs_file.c:407) [486476.552298] ? vfs_write (fs/read_write.c:777) [486476.552954] ? setup_sigcontext (arch/x86/kernel/signal.c:708) [486476.553790] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486476.554876] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486476.555749] ? preempt_count_sub (kernel/sched/core.c:2852) [486476.556567] ? _raw_spin_unlock_irq (./arch/x86/include/asm/preempt.h:95 include/linux/spinlock_api_smp.h:171 kernel/locking/spinlock.c:199) [486476.557390] ? do_setitimer (kernel/time/itimer.c:239) [486476.558147] ? check_preemption_disabled (lib/smp_processor_id.c:18) [486476.559037] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486476.559914] prepare_exit_to_usermode (arch/x86/entry/common.c:282) [486476.560400] FAULT_INJECTION: forcing a failure. [486476.560400] name failslab, interval 50, probability 30, space 0, times -1 [486476.562266] syscall_return_slowpath (arch/x86/entry/common.c:349) [486476.563123] int_ret_from_sys_call (arch/x86/entry/entry_64.S:282) [486476.563936] Memory state around the buggy address: [486476.564605] ffff8803c3a61f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [486476.565556] ffff8803c3a62000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [486476.566494] >ffff8803c3a62080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [486476.567459] ^ [486476.567901] ffff8803c3a62100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [486476.568839] ffff8803c3a62180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [486476.569771] ================================================================== [486476.570789] kasan: CONFIG_KASAN_INLINE enabled [486476.571371] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC KASAN [486476.573697] Dumping ftrace buffer: [486476.574537] (ftrace buffer empty) [486476.575185] Modules linked in: [486476.575715] CPU: 5 PID: 7429 Comm: trinity-c218 Not tainted 4.2.0-rc5-next-20150806-sasha-00040-g1b47b00-dirty #2418 [486476.577310] task: ffff8803df648000 ti: ffff880406b20000 task.ti: ffff880406b20000 [486476.578449] RIP: free_pages_and_swap_cache (./arch/x86/include/asm/bitops.h:311 (discriminator 3) include/linux/page-flags.h:337 (discriminator 3) mm/swap_state.c:238 (discriminator 3) mm/swap_state.c:265 (discriminator 3)) [486476.579870] RSP: 0018:ffff880406b27838 EFLAGS: 00010246 [486476.580693] RAX: 0000000000000000 RBX: ffff8803c3a624e8 RCX: 0000000000000000 [486476.581792] RDX: ffff8803c3a63000 RSI: ffffffff987728fb RDI: ffffffffa1f110cb [486476.582897] RBP: ffff880406b27870 R08: 0000000000000001 R09: 0000000000000000 [486476.583967] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [486476.585112] R13: dffffc0000000000 R14: ffff8803c3a62010 R15: 00000000000001fe [486476.585651] FAULT_INJECTION: forcing a failure. [486476.585651] name failslab, interval 50, probability 30, space 0, times -1 [486476.587904] FS: 00007fbd70df9700(0000) GS:ffff8802c0000000(0000) knlGS:0000000000000000 [486476.589034] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [486476.589954] CR2: 00007fbd6fdf4220 CR3: 0000000692c7b000 CR4: 00000000000006a0 [486476.591058] Stack: [486476.591434] ffff880406b27870 ffff8803c3a63000 ffff8803c3a62000 dffffc0000000000 [486476.592757] ffff880406b27910 ffff880406b27938 ffff8803c3a62008 ffff880406b278a8 [486476.594117] ffffffff986e673a ffff880406b27910 1ffff10080d64f1e dffffc0000000000 [486476.595427] Call Trace: [486476.595866] tlb_flush_mmu_free (mm/memory.c:256 (discriminator 4)) [486476.596811] tlb_finish_mmu (mm/memory.c:280) [486476.597603] exit_mmap (mm/mmap.c:2865) [486476.598227] ? SyS_remap_file_pages (mm/mmap.c:2827) [486476.598955] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486476.599752] ? __khugepaged_exit (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2563 mm/huge_memory.c:2204) [486476.600723] mmput (include/linux/compiler.h:207 kernel/fork.c:737 kernel/fork.c:704) [486476.601545] do_exit (./arch/x86/include/asm/bitops.h:311 include/linux/thread_info.h:91 kernel/exit.c:438 kernel/exit.c:733) [486476.602405] ? mm_update_next_owner (kernel/exit.c:654) [486476.603424] ? lockdep_init (kernel/locking/lockdep.c:3298) [486476.604311] ? lock_release (kernel/locking/lockdep.c:3644) [486476.605201] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486476.606412] do_group_exit (./arch/x86/include/asm/current.h:14 kernel/exit.c:859) [486476.607306] get_signal (kernel/signal.c:2353) [486476.608111] do_signal (arch/x86/kernel/signal.c:711) [486476.608752] ? do_readv_writev (include/linux/fsnotify.h:223 fs/read_write.c:821) [486476.609665] ? v9fs_file_lock_dotl (fs/9p/vfs_file.c:407) [486476.610691] ? vfs_write (fs/read_write.c:777) [486476.611596] ? setup_sigcontext (arch/x86/kernel/signal.c:708) [486476.612622] ? __raw_callee_save___pv_queued_spin_unlock (??:?) [486476.613949] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486476.615163] ? preempt_count_sub (kernel/sched/core.c:2852) [486476.616169] ? _raw_spin_unlock_irq (./arch/x86/include/asm/preempt.h:95 include/linux/spinlock_api_smp.h:171 kernel/locking/spinlock.c:199) [486476.617220] ? do_setitimer (kernel/time/itimer.c:239) [486476.618140] ? check_preemption_disabled (lib/smp_processor_id.c:18) [486476.619229] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [486476.620290] prepare_exit_to_usermode (arch/x86/entry/common.c:282) [486476.621439] syscall_return_slowpath (arch/x86/entry/common.c:349) [486476.622363] int_ret_from_sys_call (arch/x86/entry/entry_64.S:282) [486476.623369] Code: eb 0d 48 83 c3 08 48 39 d3 0f 84 9d 00 00 00 48 89 d8 48 c1 e8 03 42 80 3c 28 00 0f 85 10 01 00 00 4c 8b 23 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 0f 85 e6 00 00 00 49 8b 04 24 a9 00 00 01 00 74 All code ======== 0: eb 0d jmp 0xf 2: 48 83 c3 08 add $0x8,%rbx 6: 48 39 d3 cmp %rdx,%rbx 9: 0f 84 9d 00 00 00 je 0xac f: 48 89 d8 mov %rbx,%rax 12: 48 c1 e8 03 shr $0x3,%rax 16: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 1b: 0f 85 10 01 00 00 jne 0x131 21: 4c 8b 23 mov (%rbx),%r12 24: 4c 89 e0 mov %r12,%rax 27: 48 c1 e8 03 shr $0x3,%rax 2b:* 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 30: 0f 85 e6 00 00 00 jne 0x11c 36: 49 8b 04 24 mov (%r12),%rax 3a: a9 00 00 01 00 test $0x10000,%eax 3f: 74 00 je 0x41 Code starting with the faulting instruction =========================================== 0: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 5: 0f 85 e6 00 00 00 jne 0xf1 b: 49 8b 04 24 mov (%r12),%rax f: a9 00 00 01 00 test $0x10000,%eax 14: 74 00 je 0x16 [486476.628902] RIP free_pages_and_swap_cache (./arch/x86/include/asm/bitops.h:311 (discriminator 3) include/linux/page-flags.h:337 (discriminator 3) mm/swap_state.c:238 (discriminator 3) mm/swap_state.c:265 (discriminator 3)) [486476.630017] RSP <ffff880406b27838> [486476.633716] ---[ end trace 3e2ea69469462bc0 ]--- [486476.634480] Kernel panic - not syncing: Fatal exception Thanks, Sasha -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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