============================================
WARNING: possible recursive locking detected
5.16.0-rc3-syzkaller #0 Not tainted
--------------------------------------------
syz-executor.4/32651 is trying to acquire lock:
ffff88808223d680 (&q->done_wq){....}-{2:2}, at: io_poll_double_wake+0x2be/0x820 fs/io_uring.c:5463

but task is already holding lock:
ffff88808223d2f0 (&q->done_wq){....}-{2:2}, at: __wake_up_common_lock+0xb4/0x130 kernel/sched/wait.c:137

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

       CPU0
       ----
  lock(&q->done_wq);
  lock(&q->done_wq);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

3 locks held by syz-executor.4/32651:
 #0: ffff88808223b2f0 (&ctx->vb_mutex){+.+.}-{3:3}, at: __video_do_ioctl+0x550/0xe20 drivers/media/v4l2-core/v4l2-ioctl.c:2942
 #1: ffff88808223d138 (&q->mmap_lock){+.+.}-{3:3}, at: vb2_core_reqbufs+0x17d/0xdd0 drivers/media/common/videobuf2/videobuf2-core.c:785
 #2: ffff88808223d2f0 (&q->done_wq){....}-{2:2}, at: __wake_up_common_lock+0xb4/0x130 kernel/sched/wait.c:137

stack backtrace:
CPU: 1 PID: 32651 Comm: syz-executor.4 Not tainted 5.16.0-rc3-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:2956 [inline]
 check_deadlock kernel/locking/lockdep.c:2999 [inline]
 validate_chain kernel/locking/lockdep.c:3788 [inline]
 __lock_acquire.cold+0x149/0x3ab kernel/locking/lockdep.c:5027
 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_poll_double_wake+0x2be/0x820 fs/io_uring.c:5463
 __wake_up_common+0x147/0x650 kernel/sched/wait.c:108
 __wake_up_common_lock+0xd0/0x130 kernel/sched/wait.c:138
 __vb2_queue_cancel+0x2e8/0xd20 drivers/media/common/videobuf2/videobuf2-core.c:2028
 vb2_core_reqbufs+0x1eb/0xdd0 drivers/media/common/videobuf2/videobuf2-core.c:795
 vb2_reqbufs+0x1a3/0x200 drivers/media/common/videobuf2/videobuf2-v4l2.c:719
 v4l2_m2m_reqbufs drivers/media/v4l2-core/v4l2-mem2mem.c:578 [inline]
 v4l2_m2m_ioctl_reqbufs+0xda/0x220 drivers/media/v4l2-core/v4l2-mem2mem.c:1316
 v4l_reqbufs drivers/media/v4l2-core/v4l2-ioctl.c:2029 [inline]
 v4l_reqbufs+0xa2/0xd0 drivers/media/v4l2-core/v4l2-ioctl.c:2018
 __video_do_ioctl+0xb94/0xe20 drivers/media/v4l2-core/v4l2-ioctl.c:2974
 video_usercopy+0x474/0x16b0 drivers/media/v4l2-core/v4l2-ioctl.c:3322
 v4l2_ioctl+0x1b3/0x250 drivers/media/v4l2-core/v4l2-dev.c:364
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
 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: 0033:0x7fc883381ae9
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:00007fc8808f7188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fc883494f60 RCX: 00007fc883381ae9
RDX: 0000000020000000 RSI: 00000000c0145608 RDI: 0000000000000004
RBP: 00007fc8833dbf6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe94f0414f R14: 00007fc8808f7300 R15: 0000000000022000
 </TASK>