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Message-ID: <677fcdcd.050a0220.25a300.01c1.GAE@google.com> Date: Thu, 09 Jan 2025 05:23:25 -0800 From: syzbot <syzbot+6f7c31cf5ae4944ad6f0@...kaller.appspotmail.com> To: Liam.Howlett@...cle.com, akpm@...ux-foundation.org, jannh@...gle.com, linux-kernel@...r.kernel.org, linux-mm@...ck.org, lorenzo.stoakes@...cle.com, netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com, vbabka@...e.cz Subject: Re: [syzbot] [mm?] INFO: rcu detected stall in sys_mprotect (8) syzbot has found a reproducer for the following issue on: HEAD commit: 31eae6d99587 selftests: drv-net: test drivers sleeping in .. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=170e81df980000 kernel config: https://syzkaller.appspot.com/x/.config?x=289acde585746aad dashboard link: https://syzkaller.appspot.com/bug?extid=6f7c31cf5ae4944ad6f0 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11d7270f980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/4718c6cc0087/disk-31eae6d9.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9ad3425b5ce9/vmlinux-31eae6d9.xz kernel image: https://storage.googleapis.com/syzbot-assets/9da77adda42e/bzImage-31eae6d9.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6f7c31cf5ae4944ad6f0@...kaller.appspotmail.com rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (3 ticks this GP) idle=5abc/1/0x4000000000000000 softirq=13965/13965 fqs=0 rcu: (detected by 0, t=13596 jiffies, g=9241, q=718 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6085 Comm: modprobe Not tainted 6.13.0-rc5-syzkaller-00873-g31eae6d99587 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:__kasan_check_read+0xa/0x20 mm/kasan/shadow.c:31 Code: db eb d0 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 89 f6 48 8b 0c 24 <31> d2 e9 6f e6 ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 RSP: 0018:ffffc90000a189c0 EFLAGS: 00000007 RAX: 0000000000000024 RBX: 000000000000092d RCX: ffffffff817b274a RDX: 0000000000000008 RSI: 0000000000000008 RDI: ffffffff942bd9a0 RBP: 0000000000000008 R08: ffffffff942bd9a7 R09: 1ffffffff2857b34 R10: dffffc0000000000 R11: fffffbfff2857b35 R12: ffff88802c2d28c4 R13: dffffc0000000000 R14: 0000000000000100 R15: ffff88802c2d2908 FS: 00007f1458250380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f14583bafe4 CR3: 0000000033060000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <IRQ> instrument_atomic_read include/linux/instrumented.h:68 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] hlock_class kernel/locking/lockdep.c:228 [inline] mark_lock+0x9a/0x360 kernel/locking/lockdep.c:4727 mark_usage kernel/locking/lockdep.c:4670 [inline] __lock_acquire+0xc3e/0x2100 kernel/locking/lockdep.c:5180 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] advance_sched+0xab/0xca0 net/sched/sch_taprio.c:924 __run_hrtimer kernel/time/hrtimer.c:1739 [inline] __hrtimer_run_queues+0x59b/0xd30 kernel/time/hrtimer.c:1803 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1865 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:stack_trace_consume_entry+0xf5/0x280 kernel/stacktrace.c:93 Code: 00 fc ff df 48 8b 1b 45 8d 70 01 41 0f b6 04 17 84 c0 0f 85 31 01 00 00 45 89 31 4a 8d 1c c3 48 89 d8 48 c1 e8 03 80 3c 10 00 <74> 1a 4d 89 cf 48 89 df 49 89 d6 49 89 f5 e8 68 a2 7a 00 4d 89 f9 RSP: 0018:ffffc900030c7230 EFLAGS: 00000246 RAX: 1ffff92000618e8c RBX: ffffc900030c7460 RCX: ffffffff917a4000 RDX: dffffc0000000000 RSI: ffffffff8be00130 RDI: ffffc900030c736c RBP: ffffc900030c7368 R08: 000000000000000c R09: ffffc900030c7370 R10: ffffc900030c72d0 R11: ffffffff818b39d0 R12: 1ffff92000618e6d R13: 1ffff92000618e6d R14: 000000000000000d R15: 1ffff92000618e6e arch_stack_walk+0x10e/0x150 arch/x86/kernel/stacktrace.c:27 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4119 [inline] kmem_cache_alloc_bulk_noprof+0x4fa/0x7c0 mm/slub.c:5129 mt_alloc_bulk lib/maple_tree.c:181 [inline] mas_alloc_nodes+0x38e/0x7e0 lib/maple_tree.c:1275 mas_node_count_gfp lib/maple_tree.c:1335 [inline] mas_preallocate+0x575/0x8d0 lib/maple_tree.c:5545 vma_iter_prealloc mm/vma.h:349 [inline] __split_vma+0x302/0xc50 mm/vma.c:447 split_vma mm/vma.c:510 [inline] vma_modify+0x244/0x330 mm/vma.c:1528 vma_modify_flags+0x3a5/0x430 mm/vma.c:1546 mprotect_fixup+0x45a/0xaa0 mm/mprotect.c:666 do_mprotect_pkey+0x8d7/0xd70 mm/mprotect.c:840 __do_sys_mprotect mm/mprotect.c:861 [inline] __se_sys_mprotect mm/mprotect.c:858 [inline] __x64_sys_mprotect+0x80/0x90 mm/mprotect.c:858 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1458574bb7 Code: 00 00 00 b8 0b 00 00 00 0f 05 48 3d 01 f0 ff ff 73 01 c3 48 8d 0d b9 46 01 00 f7 d8 89 01 48 83 c8 ff c3 b8 0a 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8d 0d 99 46 01 00 f7 d8 89 01 48 83 RSP: 002b:00007fffaf755208 EFLAGS: 00000206 ORIG_RAX: 000000000000000a RAX: ffffffffffffffda RBX: 00007f1458551fc0 RCX: 00007f1458574bb7 RDX: 0000000000000001 RSI: 0000000000001000 RDI: 00007f14582c9000 RBP: 00007fffaf755320 R08: 00007fffaf755198 R09: 00007f14585515c0 R10: 00007f14582a8168 R11: 0000000000000206 R12: 00007f1458551fc0 R13: 00007f145857ceda R14: 00007f14582c9f40 R15: 00007f14582c9740 </TASK> rcu: rcu_preempt kthread timer wakeup didn't happen for 13595 jiffies! g9241 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=3487 rcu: rcu_preempt kthread starved for 13596 jiffies! g9241 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:I stack:25976 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1850/0x4c30 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6848 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.
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