======================================================== WARNING: possible irq lock inversion dependency detected 5.11.0-rc6-syzkaller #0 Not tainted -------------------------------------------------------- syz-executor913/1715 just changed the state of lock: ffff88801e107978 (&tctx->task_lock ){+...}-{2:2} , at: spin_lock include/linux/spinlock.h:354 [inline] , at: __tctx_task_work fs/io_uring.c:2193 [inline] , at: tctx_task_work+0x85/0x310 fs/io_uring.c:2232 but this lock was taken by another, HARDIRQ-safe lock in the past: ( &ctx->completion_lock ){-...}-{2:2} and interrupts could create inverse lock ordering between them. other info that might help us debug this: Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock( &tctx->task_lock ); local_irq_disable(); lock(&ctx->completion_lock ); lock( &tctx->task_lock ); lock(&ctx->completion_lock ); *** DEADLOCK *** no locks held by syz-executor913/1715. the shortest dependencies between 2nd lock and 1st lock: -> (&ctx->completion_lock ){-...}-{2:2} { IN-HARDIRQ-W at: lock_acquire kernel/locking/lockdep.c:5442 [inline] lock_acquire+0x1a8/0x720 kernel/locking/lockdep.c:5407 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:159 io_timeout_fn+0x6a/0x390 fs/io_uring.c:5770 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x4d7/0xb00 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x300/0x930 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1102 asm_call_irq_on_stack+0xf/0x20 __run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline] run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline] sysvec_apic_timer_interrupt+0xbd/0x100 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] _raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:199 spin_unlock_irq include/linux/spinlock.h:404 [inline] io_timeout fs/io_uring.c:5979 [inline] io_issue_sqe+0x10ab/0x4910 fs/io_uring.c:6351 __io_queue_sqe+0x1b8/0xc70 fs/io_uring.c:6616 io_queue_link_head fs/io_uring.c:6702 [inline] io_submit_sqe fs/io_uring.c:6749 [inline] io_submit_sqes+0x149f/0x2460 fs/io_uring.c:7005 __do_sys_io_uring_enter+0xb94/0x17d0 fs/io_uring.c:9533 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5442 [inline] lock_acquire+0x1a8/0x720 kernel/locking/lockdep.c:5407 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:159 io_req_complete_post+0x49/0x780 fs/io_uring.c:1925 __io_req_complete fs/io_uring.c:1965 [inline] io_req_complete fs/io_uring.c:1970 [inline] __io_queue_sqe+0x30e/0xc70 fs/io_uring.c:6660 io_submit_sqe fs/io_uring.c:6764 [inline] io_submit_sqes+0x1110/0x2460 fs/io_uring.c:7005 __do_sys_io_uring_enter+0xb94/0x17d0 fs/io_uring.c:9533 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 } ... key at: [] __key.9+0x0/0x40 ... acquired at: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] io_task_work_add fs/io_uring.c:2247 [inline] io_req_task_work_add+0x10d/0x500 fs/io_uring.c:2297 io_free_req_deferred fs/io_uring.c:2496 [inline] io_put_req_deferred fs/io_uring.c:2504 [inline] io_kill_timeout.part.0+0x22a/0x390 fs/io_uring.c:1641 io_kill_timeout fs/io_uring.c:1690 [inline] io_flush_timeouts fs/io_uring.c:1709 [inline] io_commit_cqring+0x210/0x9b0 fs/io_uring.c:1717 io_req_complete_post+0x65/0x780 fs/io_uring.c:1927 __io_req_complete fs/io_uring.c:1965 [inline] io_req_complete fs/io_uring.c:1970 [inline] __io_queue_sqe+0x30e/0xc70 fs/io_uring.c:6660 io_submit_sqe fs/io_uring.c:6764 [inline] io_submit_sqes+0x1110/0x2460 fs/io_uring.c:7005 __do_sys_io_uring_enter+0xb94/0x17d0 fs/io_uring.c:9533 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 -> (&tctx->task_lock ){+...}-{2:2} { HARDIRQ-ON-W at: lock_acquire kernel/locking/lockdep.c:5442 [inline] lock_acquire+0x1a8/0x720 kernel/locking/lockdep.c:5407 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] __tctx_task_work fs/io_uring.c:2193 [inline] tctx_task_work+0x85/0x310 fs/io_uring.c:2232 task_work_run+0xc0/0x160 kernel/task_work.c:140 tracehook_notify_signal include/linux/tracehook.h:212 [inline] handle_signal_work kernel/entry/common.c:145 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x221/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5442 [inline] lock_acquire+0x1a8/0x720 kernel/locking/lockdep.c:5407 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] io_task_work_add fs/io_uring.c:2247 [inline] io_req_task_work_add+0x10d/0x500 fs/io_uring.c:2297 io_free_req_deferred fs/io_uring.c:2496 [inline] io_put_req_deferred fs/io_uring.c:2504 [inline] io_kill_timeout.part.0+0x22a/0x390 fs/io_uring.c:1641 io_kill_timeout fs/io_uring.c:1690 [inline] io_flush_timeouts fs/io_uring.c:1709 [inline] io_commit_cqring+0x210/0x9b0 fs/io_uring.c:1717 io_req_complete_post+0x65/0x780 fs/io_uring.c:1927 __io_req_complete fs/io_uring.c:1965 [inline] io_req_complete fs/io_uring.c:1970 [inline] __io_queue_sqe+0x30e/0xc70 fs/io_uring.c:6660 io_submit_sqe fs/io_uring.c:6764 [inline] io_submit_sqes+0x1110/0x2460 fs/io_uring.c:7005 __do_sys_io_uring_enter+0xb94/0x17d0 fs/io_uring.c:9533 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 } ... key at: [] __key.15+0x0/0x40 ... acquired at: mark_usage kernel/locking/lockdep.c:4320 [inline] __lock_acquire+0x87b/0x57d0 kernel/locking/lockdep.c:4786 lock_acquire kernel/locking/lockdep.c:5442 [inline] lock_acquire+0x1a8/0x720 kernel/locking/lockdep.c:5407 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] __tctx_task_work fs/io_uring.c:2193 [inline] tctx_task_work+0x85/0x310 fs/io_uring.c:2232 task_work_run+0xc0/0x160 kernel/task_work.c:140 tracehook_notify_signal include/linux/tracehook.h:212 [inline] handle_signal_work kernel/entry/common.c:145 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x221/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 stack backtrace: CPU: 1 PID: 1715 Comm: syz-executor913 Not tainted 5.11.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x9a/0xcc lib/dump_stack.c:120 print_irq_inversion_bug kernel/locking/lockdep.c:4413 [inline] check_usage_backwards kernel/locking/lockdep.c:3884 [inline] mark_lock_irq kernel/locking/lockdep.c:3974 [inline] mark_lock.cold+0x6d/0x72 kernel/locking/lockdep.c:4411 mark_usage kernel/locking/lockdep.c:4320 [inline] __lock_acquire+0x87b/0x57d0 kernel/locking/lockdep.c:4786 lock_acquire kernel/locking/lockdep.c:5442 [inline] lock_acquire+0x1a8/0x720 kernel/locking/lockdep.c:5407 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] __tctx_task_work fs/io_uring.c:2193 [inline] tctx_task_work+0x85/0x310 fs/io_uring.c:2232 task_work_run+0xc0/0x160 kernel/task_work.c:140 tracehook_notify_signal include/linux/tracehook.h:212 [inline] handle_signal_work kernel/entry/common.c:145 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x221/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4510d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 21 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00000000005efcd8 EFLAGS: 00000216 ORIG_RAX: 00000000000001aa RAX: 0000000000000100 RBX: 0000000000000003 RCX: 00000000004510d9 RDX: 0000000000000000 RSI: 000000000000450c RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000216 R12: 00000000005efd28 R13: 00000000005efd40 R14: 00000000005efd80 R15: 00000000000019f2