============================================
WARNING: possible recursive locking detected
5.18.0-rc3-next-20220419-syzkaller #0 Not tainted
--------------------------------------------
syz-executor.3/15350 is trying to acquire lock:
ffff88805fc373d8 (&ctx->timeout_lock){....}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:379 [inline]
ffff88805fc373d8 (&ctx->timeout_lock){....}-{2:2}, at: io_disarm_next+0x545/0xaa0 fs/io_uring.c:2452

but task is already holding lock:
ffff88805fc373d8 (&ctx->timeout_lock){....}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:379 [inline]
ffff88805fc373d8 (&ctx->timeout_lock){....}-{2:2}, at: io_flush_timeouts fs/io_uring.c:1839 [inline]
ffff88805fc373d8 (&ctx->timeout_lock){....}-{2:2}, at: __io_commit_cqring_flush.cold+0x92/0x550 fs/io_uring.c:1875

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&ctx->timeout_lock);
  lock(&ctx->timeout_lock);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

3 locks held by syz-executor.3/15350:
 #0: ffff88805fc370a8 (&ctx->uring_lock){+.+.}-{3:3}, at: __do_sys_io_uring_enter+0x11fa/0x2300 fs/io_uring.c:11126
 #1: ffff88805fc37398 (&ctx->completion_lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline]
 #1: ffff88805fc37398 (&ctx->completion_lock){+.+.}-{2:2}, at: __io_commit_cqring_flush+0x308/0x5f0 fs/io_uring.c:1873
 #2: ffff88805fc373d8 (&ctx->timeout_lock){....}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:379 [inline]
 #2: ffff88805fc373d8 (&ctx->timeout_lock){....}-{2:2}, at: io_flush_timeouts fs/io_uring.c:1839 [inline]
 #2: ffff88805fc373d8 (&ctx->timeout_lock){....}-{2:2}, at: __io_commit_cqring_flush.cold+0x92/0x550 fs/io_uring.c:1875

stack backtrace:
CPU: 1 PID: 15350 Comm: syz-executor.3 Not tainted 5.18.0-rc3-next-20220419-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_deadlock_bug kernel/locking/lockdep.c:2988 [inline]
 check_deadlock kernel/locking/lockdep.c:3031 [inline]
 validate_chain kernel/locking/lockdep.c:3816 [inline]
 __lock_acquire.cold+0x1f5/0x3b4 kernel/locking/lockdep.c:5053
 lock_acquire kernel/locking/lockdep.c:5665 [inline]
 lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
 _raw_spin_lock_irq+0x32/0x50 kernel/locking/spinlock.c:170
 spin_lock_irq include/linux/spinlock.h:379 [inline]
 io_disarm_next+0x545/0xaa0 fs/io_uring.c:2452
 __io_req_complete_post+0x794/0xd90 fs/io_uring.c:2200
 io_kill_timeout fs/io_uring.c:1815 [inline]
 io_kill_timeout+0x210/0x21d fs/io_uring.c:1803
 io_flush_timeouts fs/io_uring.c:1858 [inline]
 __io_commit_cqring_flush.cold+0x43f/0x550 fs/io_uring.c:1875
 io_cqring_ev_posted fs/io_uring.c:1980 [inline]
 __io_submit_flush_completions+0x719/0x800 fs/io_uring.c:2778
 io_submit_flush_completions fs/io_uring.c:1340 [inline]
 io_submit_state_end fs/io_uring.c:8161 [inline]
 io_submit_sqes+0xbc4/0x90a0 fs/io_uring.c:8269
 __do_sys_io_uring_enter+0x1205/0x2300 fs/io_uring.c:11127
 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: 0033:0x7f711ae890e9
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f711c081168 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 00007f711af9bf60 RCX: 00007f711ae890e9
RDX: 0000000000000000 RSI: 0000000000003ed9 RDI: 0000000000000003
RBP: 00007f711aee308d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcc59d50ff R14: 00007f711c081300 R15: 0000000000022000
 </TASK>