============================================
WARNING: possible recursive locking detected
5.19.0-rc7-syzkaller-00199-g515f71412bb7 #0 Not tainted
--------------------------------------------
syz-executor350/3611 is trying to acquire lock:
ffff888021e77468 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:103 [inline]
ffff888021e77468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_write+0x12f/0x1b00 fs/pipe.c:431

but task is already holding lock:
ffff888021e77868 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock_nested fs/pipe.c:82 [inline]
ffff888021e77868 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock fs/pipe.c:90 [inline]
ffff888021e77868 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_wait_readable+0x3d7/0x550 fs/pipe.c:1049

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

       CPU0
       ----
  lock(&pipe->mutex/1);
  lock(&pipe->mutex/1);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

1 lock held by syz-executor350/3611:
 #0: ffff888021e77868 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock_nested fs/pipe.c:82 [inline]
 #0: ffff888021e77868 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock fs/pipe.c:90 [inline]
 #0: ffff888021e77868 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_wait_readable+0x3d7/0x550 fs/pipe.c:1049

stack backtrace:
CPU: 0 PID: 3611 Comm: syz-executor350 Not tainted 5.19.0-rc7-syzkaller-00199-g515f71412bb7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_deadlock_bug kernel/locking/lockdep.c:2988 [inline]
 check_deadlock kernel/locking/lockdep.c:3031 [inline]
 validate_chain+0x485d/0x65c0 kernel/locking/lockdep.c:3816
 __lock_acquire+0x129a/0x1f80 kernel/locking/lockdep.c:5053
 lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5665
 __mutex_lock_common+0x1de/0x26c0 kernel/locking/mutex.c:603
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799
 __pipe_lock fs/pipe.c:103 [inline]
 pipe_write+0x12f/0x1b00 fs/pipe.c:431
 do_iter_readv_writev+0x499/0x650
 do_iter_write+0x1f1/0x7a0 fs/read_write.c:868
 iter_file_splice_write+0x830/0xff0 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 do_splice+0x1105/0x1930 fs/splice.c:1079
 __do_splice fs/splice.c:1144 [inline]
 __do_sys_splice fs/splice.c:1350 [inline]
 __se_sys_splice+0x2a8/0x410 fs/splice.c:1332
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f7d8ecce8c9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7d8ec80308 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 00007f7d8ed56408 RCX: 00007f7d8ecce8c9
RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f7d8ed56400 R08: 00000000000001ff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7d8ed5640c
R13: 00007ffe0d81fdcf R14: 00007f7d8ec80400 R15: 0000000000022000
 </TASK>