============================================
WARNING: possible recursive locking detected
5.18.0-rc3-next-20220420-syzkaller #0 Not tainted
--------------------------------------------
syz-executor.2/13724 is trying to acquire lock:
ffff888026dfb3d8 (&ctx->timeout_lock){-...}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:379 [inline]
ffff888026dfb3d8 (&ctx->timeout_lock){-...}-{2:2}, at: io_disarm_next+0x545/0xaa0 fs/io_uring.c:2452

but task is already holding lock:
ffff888026dfb3d8 (&ctx->timeout_lock){-...}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:379 [inline]
ffff888026dfb3d8 (&ctx->timeout_lock){-...}-{2:2}, at: io_kill_timeouts+0x4c/0x227 fs/io_uring.c:10431

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

2 locks held by syz-executor.2/13724:
 #0: ffff888026dfb398 (&ctx->completion_lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline]
 #0: ffff888026dfb398 (&ctx->completion_lock){+.+.}-{2:2}, at: io_kill_timeouts+0x38/0x227 fs/io_uring.c:10430
 #1: ffff888026dfb3d8 (&ctx->timeout_lock){-...}-{2:2}
, at: spin_lock_irq include/linux/spinlock.h:379 [inline]
, at: io_kill_timeouts+0x4c/0x227 fs/io_uring.c:10431

stack backtrace:
CPU: 1 PID: 13724 Comm: syz-executor.2 Not tainted 5.18.0-rc3-next-20220420-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_kill_timeouts+0xe2/0x227 fs/io_uring.c:10434
 io_ring_ctx_wait_and_kill+0x1eb/0x360 fs/io_uring.c:10461
 io_uring_release+0x42/0x46 fs/io_uring.c:10482
 __fput+0x277/0x9d0 fs/file_table.c:317
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:37 [inline]
 do_exit+0xaff/0x2a00 kernel/exit.c:796
 do_group_exit+0xd2/0x2f0 kernel/exit.c:926
 get_signal+0x22df/0x24c0 kernel/signal.c:2864
 arch_do_signal_or_restart+0x82/0x20f0 arch/x86/kernel/signal.c:869
 exit_to_user_mode_loop kernel/entry/common.c:166 [inline]
 exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f6ffec890e9
Code: Unable to access opcode bytes at RIP 0x7f6ffec890bf.
RSP: 002b:00007f6fffd65168 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: 0000000000000200 RBX: 00007f6ffed9c030 RCX: 00007f6ffec890e9
RDX: 0000000000000000 RSI: 0000000000003ed9 RDI: 0000000000000004
RBP: 00007f6ffece308d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff9d75623f R14: 00007f6fffd65300 R15: 0000000000022000
 </TASK>