================================ WARNING: inconsistent lock state 5.16.0-rc2-syzkaller #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. syz-executor.5/1014 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff8880796c3418 (&ctx->timeout_lock){?.+.}-{2:2}, at: io_timeout_fn+0x6f/0x360 fs/io_uring.c:5943 {HARDIRQ-ON-W} state was registered at: __trace_hardirqs_on_caller kernel/locking/lockdep.c:4224 [inline] lockdep_hardirqs_on_prepare kernel/locking/lockdep.c:4292 [inline] lockdep_hardirqs_on_prepare+0x135/0x400 kernel/locking/lockdep.c:4244 trace_hardirqs_on+0x5b/0x1c0 kernel/trace/trace_preemptirq.c:49 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] _raw_spin_unlock_irq+0x1f/0x40 kernel/locking/spinlock.c:202 spin_unlock_irq include/linux/spinlock.h:399 [inline] __io_poll_remove_one fs/io_uring.c:5669 [inline] __io_poll_remove_one fs/io_uring.c:5654 [inline] io_poll_remove_one+0x236/0x870 fs/io_uring.c:5680 io_poll_remove_all+0x1af/0x235 fs/io_uring.c:5709 io_ring_ctx_wait_and_kill+0x1cc/0x322 fs/io_uring.c:9534 io_uring_release+0x42/0x46 fs/io_uring.c:9554 __fput+0x286/0x9f0 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae irq event stamp: 12698 hardirqs last enabled at (12697): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1328 [inline] hardirqs last enabled at (12697): [] finish_lock_switch kernel/sched/core.c:4732 [inline] hardirqs last enabled at (12697): [] finish_task_switch.isra.0+0x319/0xb80 kernel/sched/core.c:4850 hardirqs last disabled at (12698): [] sysvec_apic_timer_interrupt+0xb/0xc0 arch/x86/kernel/apic/apic.c:1097 softirqs last enabled at (11964): [] invoke_softirq kernel/softirq.c:432 [inline] softirqs last enabled at (11964): [] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:636 softirqs last disabled at (11955): [] invoke_softirq kernel/softirq.c:432 [inline] softirqs last disabled at (11955): [] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:636 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&ctx->timeout_lock); lock(&ctx->timeout_lock); *** DEADLOCK *** no locks held by syz-executor.5/1014. stack backtrace: CPU: 0 PID: 1014 Comm: syz-executor.5 Not tainted 5.16.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_usage_bug kernel/locking/lockdep.c:203 [inline] valid_state kernel/locking/lockdep.c:3945 [inline] mark_lock_irq kernel/locking/lockdep.c:4148 [inline] mark_lock.cold+0x61/0x8e kernel/locking/lockdep.c:4605 mark_usage kernel/locking/lockdep.c:4497 [inline] __lock_acquire+0x149d/0x54a0 kernel/locking/lockdep.c:4981 lock_acquire kernel/locking/lockdep.c:5637 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 io_timeout_fn+0x6f/0x360 fs/io_uring.c:5943 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:finish_task_switch.isra.0+0x323/0xb80 kernel/sched/core.c:4852 Code: a3 14 f4 07 85 c0 75 02 0f 0b 48 85 db 0f 85 25 01 00 00 4c 89 f7 e8 fc f7 ff ff e8 07 4a 2d 00 fb 65 48 8b 1c 25 40 70 02 00 <48> 8d bb 80 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 RSP: 0018:ffffc900043c7d88 EFLAGS: 00000206 RAX: 0000000000003199 RBX: ffff88807488c200 RCX: 1ffffffff1b21741 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900043c7dd0 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff817d1748 R11: 0000000000000000 R12: ffff8880b9c3a858 R13: ffff88807b9f2280 R14: ffff8880b9c39b00 R15: ffff8880b9c3a538 context_switch kernel/sched/core.c:4975 [inline] __schedule+0xaa2/0x4940 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 exit_to_user_mode_loop kernel/entry/common.c:163 [inline] exit_to_user_mode_prepare+0x14a/0x290 kernel/entry/common.c:207 irqentry_exit_to_user_mode+0x5/0x40 kernel/entry/common.c:313 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0033:0x7fb3079469d7 Code: 39 d1 73 14 0f 1f 80 00 00 00 00 48 8b 50 f8 48 83 e8 08 48 39 ca 77 f3 48 39 c3 73 3e 48 89 13 48 8b 50 f8 48 89 38 49 8b 0e <48> 8b 3e 48 83 c3 08 48 83 c6 08 eb bc 48 39 d1 72 9e 48 39 d0 73 RSP: 002b:00007ffd17aa76f0 EFLAGS: 00000287 RAX: 00007fb3077d46c0 RBX: 00007fb3077715f0 RCX: ffffffff87ea3c80 RDX: ffffffff872e9ad7 RSI: 00007fb3077715f8 RDI: ffffffff872e95bc RBP: 00007fb307740278 R08: 00007fb3077ec520 R09: 0000001b2fb225e0 R10: 0000000000000d0a R11: 0000000029138d0e R12: 00007fb307740270 R13: 00007fb3077715f0 R14: 00007fb307740268 R15: 000000000000001d vkms_vblank_simulate: vblank timer overrun vkms_vblank_simulate: vblank timer overrun ---------------- Code disassembly (best guess): 0: a3 14 f4 07 85 c0 75 movabs %eax,0xf0275c08507f414 7: 02 0f 9: 0b 48 85 or -0x7b(%rax),%ecx c: db 0f fisttpl (%rdi) e: 85 25 01 00 00 4c test %esp,0x4c000001(%rip) # 0x4c000015 14: 89 f7 mov %esi,%edi 16: e8 fc f7 ff ff callq 0xfffff817 1b: e8 07 4a 2d 00 callq 0x2d4a27 20: fb sti 21: 65 48 8b 1c 25 40 70 mov %gs:0x27040,%rbx 28: 02 00 * 2a: 48 8d bb 80 15 00 00 lea 0x1580(%rbx),%rdi <-- trapping instruction 31: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 38: fc ff df 3b: 48 89 fa mov %rdi,%rdx 3e: 48 rex.W 3f: c1 .byte 0xc1