================================ WARNING: inconsistent lock state 5.16.0-rc2-syzkaller #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. syz-executor.0/4726 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff888024ea6418 (&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: 1184 hardirqs last enabled at (1183): [] asm_sysvec_call_function+0x12/0x20 arch/x86/include/asm/idtentry.h:647 hardirqs last disabled at (1184): [] sysvec_apic_timer_interrupt+0xb/0xc0 arch/x86/kernel/apic/apic.c:1097 softirqs last enabled at (1166): [] invoke_softirq kernel/softirq.c:432 [inline] softirqs last enabled at (1166): [] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:636 softirqs last disabled at (1151): [] invoke_softirq kernel/softirq.c:432 [inline] softirqs last disabled at (1151): [] __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 *** 2 locks held by syz-executor.0/4726: #0: ffff888024ea60a8 (&ctx->uring_lock){+.+.}-{3:3}, at: __do_sys_io_uring_enter+0xf60/0x1f50 fs/io_uring.c:10042 #1: ffffffff8bb81120 (rcu_read_lock){....}-{1:2}, at: percpu_ref_get_many+0x0/0x1f0 include/linux/percpu-refcount.h:247 stack backtrace: CPU: 3 PID: 4726 Comm: syz-executor.0 Not tainted 5.16.0-rc2-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 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:__ref_is_percpu include/linux/percpu-refcount.h:174 [inline] RIP: 0010:percpu_ref_get_many+0x6f/0x1f0 include/linux/percpu-refcount.h:204 Code: c6 e8 c5 09 97 ff 40 84 ed 58 0f 84 17 01 00 00 e8 d6 05 97 ff 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 <0f> 85 65 01 00 00 48 8b 2b 31 ff 49 89 ed 41 83 e5 03 4c 89 ee e8 RSP: 0018:ffffc90004257b38 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffff888024ea6000 RCX: ffffc90006afe000 RDX: 1ffff110049d4c00 RSI: ffffffff81dfcd0a RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff81dfccfb R11: 0000000000000000 R12: 0000000000000008 R13: 0000000000000008 R14: 0000000000000000 R15: dffffc0000000000 __io_alloc_req_refill fs/io_uring.c:1989 [inline] io_alloc_req_refill fs/io_uring.c:2002 [inline] io_submit_sqes.cold+0x2b0/0x43d fs/io_uring.c:7314 __do_sys_io_uring_enter+0xf6e/0x1f50 fs/io_uring.c:10043 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f52c36baae9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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:00007f52c0c30188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 00007f52c37cdf60 RCX: 00007f52c36baae9 RDX: 0000000000000000 RSI: 00000000000068ac RDI: 0000000000000003 RBP: 00007f52c3714f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe2149013f R14: 00007f52c0c30300 R15: 0000000000022000 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: e8 c5 09 97 ff callq 0xff9709ca 5: 40 84 ed test %bpl,%bpl 8: 58 pop %rax 9: 0f 84 17 01 00 00 je 0x126 f: e8 d6 05 97 ff callq 0xff9705ea 14: 48 89 da mov %rbx,%rdx 17: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1e: fc ff df 21: 48 c1 ea 03 shr $0x3,%rdx 25: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) * 29: 0f 85 65 01 00 00 jne 0x194 <-- trapping instruction 2f: 48 8b 2b mov (%rbx),%rbp 32: 31 ff xor %edi,%edi 34: 49 89 ed mov %rbp,%r13 37: 41 83 e5 03 and $0x3,%r13d 3b: 4c 89 ee mov %r13,%rsi 3e: e8 .byte 0xe8