============================================
WARNING: possible recursive locking detected
6.1.84-syzkaller #0 Not tainted
--------------------------------------------
syz-executor.4/5843 is trying to acquire lock:
ffff88801e4ed868 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:103 [inline]
ffff88801e4ed868 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_write+0x12d/0x1af0 fs/pipe.c:431

but task is already holding lock:
ffff88807886a468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock_nested fs/pipe.c:82 [inline]
ffff88807886a468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock fs/pipe.c:90 [inline]
ffff88807886a468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_wait_readable+0x3df/0x550 fs/pipe.c:1047

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-executor.4/5843:
 #0: ffff88807886a468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock_nested fs/pipe.c:82 [inline]
 #0: ffff88807886a468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock fs/pipe.c:90 [inline]
 #0: ffff88807886a468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_wait_readable+0x3df/0x550 fs/pipe.c:1047

stack backtrace:
CPU: 0 PID: 5843 Comm: syz-executor.4 Not tainted 6.1.84-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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:2983 [inline]
 check_deadlock kernel/locking/lockdep.c:3026 [inline]
 validate_chain+0x4711/0x5950 kernel/locking/lockdep.c:3812
 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
 __mutex_lock_common kernel/locking/mutex.c:603 [inline]
 __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747
 __pipe_lock fs/pipe.c:103 [inline]
 pipe_write+0x12d/0x1af0 fs/pipe.c:431
 do_iter_write+0x6e6/0xc50 fs/read_write.c:861
 iter_file_splice_write+0x830/0xfc0 fs/splice.c:685
 do_splice_from fs/splice.c:763 [inline]
 do_splice+0xfdb/0x1790 fs/splice.c:1102
 __do_splice fs/splice.c:1167 [inline]
 __do_sys_splice fs/splice.c:1374 [inline]
 __se_sys_splice+0x340/0x420 fs/splice.c:1356
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fa56987de69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa56a6830c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 00007fa5699abf80 RCX: 00007fa56987de69
RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007fa5698ca47a R08: 0000000000008002 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fa5699abf80 R15: 00007ffd5a413a78
 </TASK>