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Message-ID: <0000000000009835a7061de7f358@google.com> Date: Tue, 23 Jul 2024 03:52:01 -0700 From: syzbot <syzbot+ec4b7d82bb051330f15a@...kaller.appspotmail.com> To: hdanton@...a.com, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [mm?] BUG: Bad page map (8) Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: BUG: Bad page map BUG: Bad page cache in process syz.0.15 pfn:4b63a page: refcount:4 mapcount:1 mapping:000000003ee7caca index:0x0 pfn:0x4b63a memcg:f4f00000060ad000 aops:shmem_aops ino:401 flags: 0x1ffc0000004002d(locked|referenced|uptodate|lru|swapbacked|node=0|zone=0|lastcpupid=0x7ff|kasantag=0x0) raw: 01ffc0000004002d ffffc1ffc01a0988 ffffc1ffc01a2fc8 f1f00000070f2470 raw: 0000000000000000 0000000000000000 0000000400000000 f4f00000060ad000 page dumped because: still mapped when deleted CPU: 1 PID: 3851 Comm: syz.0.15 Not tainted 6.10.0-rc7-syzkaller-00266-g4d145e3f830b-dirty #0 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace+0x94/0xec arch/arm64/kernel/stacktrace.c:317 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:324 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x78/0x90 lib/dump_stack.c:114 dump_stack+0x18/0x24 lib/dump_stack.c:123 filemap_unaccount_folio+0x118/0x278 mm/filemap.c:167 __filemap_remove_folio+0x3c/0x178 mm/filemap.c:231 filemap_remove_folio+0x48/0xa8 mm/filemap.c:264 truncate_inode_folio+0x30/0x4c mm/truncate.c:195 shmem_undo_range+0x208/0x620 mm/shmem.c:1012 shmem_truncate_range mm/shmem.c:1125 [inline] shmem_evict_inode+0x130/0x2dc mm/shmem.c:1253 evict+0xb4/0x198 fs/inode.c:667 iput_final fs/inode.c:1741 [inline] iput fs/inode.c:1767 [inline] iput+0x100/0x1b8 fs/inode.c:1753 dentry_unlink_inode+0xc0/0x188 fs/dcache.c:404 __dentry_kill+0x7c/0x1d4 fs/dcache.c:607 dput.part.0+0x30/0xbc fs/dcache.c:849 dput+0x4c/0x50 fs/dcache.c:860 __fput+0x110/0x2d4 fs/file_table.c:430 ____fput+0x10/0x1c fs/file_table.c:450 task_work_run+0x78/0xd0 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x134/0x164 arch/arm64/kernel/entry-common.c:151 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0xc8/0xf8 arch/arm64/kernel/entry-common.c:713 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:598 BUG: Bad page cache in process syz.0.15 pfn:468bf page: refcount:4 mapcount:1 mapping:000000003ee7caca index:0x1 pfn:0x468bf memcg:f4f00000060ad000 aops:shmem_aops ino:401 flags: 0x1ffc0000004002d(locked|referenced|uptodate|lru|swapbacked|node=0|zone=0|lastcpupid=0x7ff|kasantag=0x0) raw: 01ffc0000004002d ffffc1ffc02d8e88 ffffc1ffc02d7448 f1f00000070f2470 raw: 0000000000000001 0000000000000000 0000000400000000 f4f00000060ad000 page dumped because: still mapped when deleted CPU: 1 PID: 3851 Comm: syz.0.15 Tainted: G B 6.10.0-rc7-syzkaller-00266-g4d145e3f830b-dirty #0 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace+0x94/0xec arch/arm64/kernel/stacktrace.c:317 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:324 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x78/0x90 lib/dump_stack.c:114 dump_stack+0x18/0x24 lib/dump_stack.c:123 filemap_unaccount_folio+0x118/0x278 mm/filemap.c:167 __filemap_remove_folio+0x3c/0x178 mm/filemap.c:231 filemap_remove_folio+0x48/0xa8 mm/filemap.c:264 truncate_inode_folio+0x30/0x4c mm/truncate.c:195 shmem_undo_range+0x208/0x620 mm/shmem.c:1012 shmem_truncate_range mm/shmem.c:1125 [inline] shmem_evict_inode+0x130/0x2dc mm/shmem.c:1253 evict+0xb4/0x198 fs/inode.c:667 iput_final fs/inode.c:1741 [inline] iput fs/inode.c:1767 [inline] iput+0x100/0x1b8 fs/inode.c:1753 dentry_unlink_inode+0xc0/0x188 fs/dcache.c:404 __dentry_kill+0x7c/0x1d4 fs/dcache.c:607 dput.part.0+0x30/0xbc fs/dcache.c:849 dput+0x4c/0x50 fs/dcache.c:860 __fput+0x110/0x2d4 fs/file_table.c:430 ____fput+0x10/0x1c fs/file_table.c:450 task_work_run+0x78/0xd0 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x134/0x164 arch/arm64/kernel/entry-common.c:151 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0xc8/0xf8 arch/arm64/kernel/entry-common.c:713 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:598 BUG: Bad page map in process syz.0.15 pte:6000004b63a8c3 pmd:800000043b9a003 page: refcount:1 mapcount:-1 mapping:0000000000000000 index:0x0 pfn:0x4b63a memcg:f4f00000060ad000 flags: 0x1ffc0000004002c(referenced|uptodate|lru|swapbacked|node=0|zone=0|lastcpupid=0x7ff|kasantag=0x0) raw: 01ffc0000004002c ffffc1ffc0325848 ffffc1ffc01a2fc8 0000000000000000 raw: 0000000000000000 0000000000000000 00000001fffffffe f4f00000060ad000 page dumped because: bad pte addr:00000000209a0000 vm_flags:400000f9 anon_vma:0000000000000000 mapping:fcf00000033edda8 index:0 file:dmabuf fault:udmabuf_vm_fault mmap:dma_buf_mmap_internal read_folio:0x0 CPU: 1 PID: 3851 Comm: syz.0.15 Tainted: G B 6.10.0-rc7-syzkaller-00266-g4d145e3f830b-dirty #0 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace+0x94/0xec arch/arm64/kernel/stacktrace.c:317 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:324 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x78/0x90 lib/dump_stack.c:114 dump_stack+0x18/0x24 lib/dump_stack.c:123 print_bad_pte+0x1c8/0x258 mm/memory.c:538 zap_present_folio_ptes mm/memory.c:1508 [inline] zap_present_ptes mm/memory.c:1564 [inline] zap_pte_range mm/memory.c:1606 [inline] zap_pmd_range mm/memory.c:1724 [inline] zap_pud_range mm/memory.c:1753 [inline] zap_p4d_range mm/memory.c:1774 [inline] unmap_page_range+0x904/0x1190 mm/memory.c:1795 unmap_single_vma.constprop.0+0x4c/0x84 mm/memory.c:1841 unmap_vmas+0x7c/0x170 mm/memory.c:1885 exit_mmap+0xc0/0x288 mm/mmap.c:3341 __mmput+0x3c/0x170 kernel/fork.c:1346 mmput+0x50/0x5c kernel/fork.c:1368 exit_mm kernel/exit.c:567 [inline] do_exit+0x270/0x98c kernel/exit.c:863 do_group_exit+0x34/0x90 kernel/exit.c:1025 __do_sys_exit_group kernel/exit.c:1036 [inline] __se_sys_exit_group kernel/exit.c:1034 [inline] pid_child_should_wake+0x0/0x5c kernel/exit.c:1034 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x48/0x118 arch/arm64/kernel/syscall.c:48 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:131 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:150 el0_svc+0x34/0xf8 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:598 BUG: Bad page map in process syz.0.15 pte:600000468bf8c3 pmd:800000043b9a003 page: refcount:1 mapcount:-1 mapping:0000000000000000 index:0x1 pfn:0x468bf memcg:f4f00000060ad000 flags: 0x1ffc0000004002c(referenced|uptodate|lru|swapbacked|node=0|zone=0|lastcpupid=0x7ff|kasantag=0x0) raw: 01ffc0000004002c ffffc1ffc02d8e88 ffffc1ffc02d7448 0000000000000000 raw: 0000000000000001 0000000000000000 00000001fffffffe f4f00000060ad000 page dumped because: bad pte addr:00000000209a1000 vm_flags:400000f9 anon_vma:0000000000000000 mapping:fcf00000033edda8 index:1 file:dmabuf fault:udmabuf_vm_fault mmap:dma_buf_mmap_internal read_folio:0x0 CPU: 1 PID: 3851 Comm: syz.0.15 Tainted: G B 6.10.0-rc7-syzkaller-00266-g4d145e3f830b-dirty #0 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace+0x94/0xec arch/arm64/kernel/stacktrace.c:317 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:324 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x78/0x90 lib/dump_stack.c:114 dump_stack+0x18/0x24 lib/dump_stack.c:123 print_bad_pte+0x1c8/0x258 mm/memory.c:538 zap_present_folio_ptes mm/memory.c:1508 [inline] zap_present_ptes mm/memory.c:1564 [inline] zap_pte_range mm/memory.c:1606 [inline] zap_pmd_range mm/memory.c:1724 [inline] zap_pud_range mm/memory.c:1753 [inline] zap_p4d_range mm/memory.c:1774 [inline] unmap_page_range+0x904/0x1190 mm/memory.c:1795 unmap_single_vma.constprop.0+0x4c/0x84 mm/memory.c:1841 unmap_vmas+0x7c/0x170 mm/memory.c:1885 exit_mmap+0xc0/0x288 mm/mmap.c:3341 __mmput+0x3c/0x170 kernel/fork.c:1346 mmput+0x50/0x5c kernel/fork.c:1368 exit_mm kernel/exit.c:567 [inline] do_exit+0x270/0x98c kernel/exit.c:863 do_group_exit+0x34/0x90 kernel/exit.c:1025 __do_sys_exit_group kernel/exit.c:1036 [inline] __se_sys_exit_group kernel/exit.c:1034 [inline] pid_child_should_wake+0x0/0x5c kernel/exit.c:1034 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x48/0x118 arch/arm64/kernel/syscall.c:48 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:131 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:150 el0_svc+0x34/0xf8 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:598 BUG: Bad page state in process syz.0.15 pfn:4b63a page: refcount:0 mapcount:-1 mapping:0000000000000000 index:0x0 pfn:0x4b63a flags: 0x1ffc0000004000c(referenced|uptodate|swapbacked|node=0|zone=0|lastcpupid=0x7ff|kasantag=0x0) raw: 01ffc0000004000c dead000000000100 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000000fffffffe 0000000000000000 page dumped because: nonzero mapcount Modules linked in: CPU: 1 PID: 3851 Comm: syz.0.15 Tainted: G B 6.10.0-rc7-syzkaller-00266-g4d145e3f830b-dirty #0 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace+0x94/0xec arch/arm64/kernel/stacktrace.c:317 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:324 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x78/0x90 lib/dump_stack.c:114 dump_stack+0x18/0x24 lib/dump_stack.c:123 bad_page+0x84/0x11c mm/page_alloc.c:498 free_page_is_bad_report+0x98/0xa4 mm/page_alloc.c:904 free_page_is_bad mm/page_alloc.c:914 [inline] free_pages_prepare mm/page_alloc.c:1085 [inline] free_unref_folios+0x4c0/0x624 mm/page_alloc.c:2637 folios_put_refs+0x108/0x284 mm/swap.c:1024 free_pages_and_swap_cache+0x14c/0x164 mm/swap_state.c:332 __tlb_batch_free_encoded_pages+0x4c/0xdc mm/mmu_gather.c:136 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:366 [inline] tlb_flush_mmu+0x54/0xe4 mm/mmu_gather.c:373 zap_pte_range mm/memory.c:1685 [inline] zap_pmd_range mm/memory.c:1724 [inline] zap_pud_range mm/memory.c:1753 [inline] zap_p4d_range mm/memory.c:1774 [inline] unmap_page_range+0xab0/0x1190 mm/memory.c:1795 unmap_single_vma.constprop.0+0x4c/0x84 mm/memory.c:1841 unmap_vmas+0x7c/0x170 mm/memory.c:1885 exit_mmap+0xc0/0x288 mm/mmap.c:3341 __mmput+0x3c/0x170 kernel/fork.c:1346 mmput+0x50/0x5c kernel/fork.c:1368 exit_mm kernel/exit.c:567 [inline] do_exit+0x270/0x98c kernel/exit.c:863 do_group_exit+0x34/0x90 kernel/exit.c:1025 __do_sys_exit_group kernel/exit.c:1036 [inline] __se_sys_exit_group kernel/exit.c:1034 [inline] pid_child_should_wake+0x0/0x5c kernel/exit.c:1034 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x48/0x118 arch/arm64/kernel/syscall.c:48 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:131 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:150 el0_svc+0x34/0xf8 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:598 BUG: Bad page state in process syz.0.15 pfn:468bf page: refcount:0 mapcount:-1 mapping:0000000000000000 index:0x1 pfn:0x468bf flags: 0x1ffc0000004000c(referenced|uptodate|swapbacked|node=0|zone=0|lastcpupid=0x7ff|kasantag=0x0) raw: 01ffc0000004000c dead000000000100 dead000000000122 0000000000000000 raw: 0000000000000001 0000000000000000 00000000fffffffe 0000000000000000 page dumped because: nonzero mapcount Modules linked in: CPU: 1 PID: 3851 Comm: syz.0.15 Tainted: G B 6.10.0-rc7-syzkaller-00266-g4d145e3f830b-dirty #0 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace+0x94/0xec arch/arm64/kernel/stacktrace.c:317 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:324 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x78/0x90 lib/dump_stack.c:114 dump_stack+0x18/0x24 lib/dump_stack.c:123 bad_page+0x84/0x11c mm/page_alloc.c:498 free_page_is_bad_report+0x98/0xa4 mm/page_alloc.c:904 free_page_is_bad mm/page_alloc.c:914 [inline] free_pages_prepare mm/page_alloc.c:1085 [inline] free_unref_folios+0x4c0/0x624 mm/page_alloc.c:2637 folios_put_refs+0x108/0x284 mm/swap.c:1024 free_pages_and_swap_cache+0x14c/0x164 mm/swap_state.c:332 __tlb_batch_free_encoded_pages+0x4c/0xdc mm/mmu_gather.c:136 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:366 [inline] tlb_flush_mmu+0x54/0xe4 mm/mmu_gather.c:373 zap_pte_range mm/memory.c:1685 [inline] zap_pmd_range mm/memory.c:1724 [inline] zap_pud_range mm/memory.c:1753 [inline] zap_p4d_range mm/memory.c:1774 [inline] unmap_page_range+0xab0/0x1190 mm/memory.c:1795 unmap_single_vma.constprop.0+0x4c/0x84 mm/memory.c:1841 unmap_vmas+0x7c/0x170 mm/memory.c:1885 exit_mmap+0xc0/0x288 mm/mmap.c:3341 __mmput+0x3c/0x170 kernel/fork.c:1346 mmput+0x50/0x5c kernel/fork.c:1368 exit_mm kernel/exit.c:567 [inline] do_exit+0x270/0x98c kernel/exit.c:863 do_group_exit+0x34/0x90 kernel/exit.c:1025 __do_sys_exit_group kernel/exit.c:1036 [inline] __se_sys_exit_group kernel/exit.c:1034 [inline] pid_child_should_wake+0x0/0x5c kernel/exit.c:1034 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x48/0x118 arch/arm64/kernel/syscall.c:48 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:131 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:150 el0_svc+0x34/0xf8 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:598 Tested on: commit: 4d145e3f Merge tag 'i2c-for-6.10-rc8' of git://git.ker.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=12ff8265980000 kernel config: https://syzkaller.appspot.com/x/.config?x=6b5a15443200e31 dashboard link: https://syzkaller.appspot.com/bug?extid=ec4b7d82bb051330f15a compiler: aarch64-linux-gnu-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 patch: https://syzkaller.appspot.com/x/patch.diff?x=160af2b1980000
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