============================================
WARNING: possible recursive locking detected
6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0 Not tainted
--------------------------------------------
syz-executor.3/17375 is trying to acquire lock:
ffff00011070dc68 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:103 [inline]
ffff00011070dc68 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_write+0x68/0xc48 fs/pipe.c:431

but task is already holding lock:
ffff00011070d468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock_nested fs/pipe.c:82 [inline]
ffff00011070d468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock fs/pipe.c:90 [inline]
ffff00011070d468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_wait_readable+0x1a4/0x1e0 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-executor.3/17375:
 #0: ffff00011070d468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock_nested fs/pipe.c:82 [inline]
 #0: ffff00011070d468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock fs/pipe.c:90 [inline]
 #0: ffff00011070d468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_wait_readable+0x1a4/0x1e0 fs/pipe.c:1049

stack backtrace:
CPU: 1 PID: 17375 Comm: syz-executor.3 Not tainted 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022
Call trace:
 dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:156
 show_stack+0x2c/0x54 arch/arm64/kernel/stacktrace.c:163
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x104/0x16c lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 __lock_acquire+0x808/0x30a4
 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666
 __mutex_lock_common+0xd4/0xca8 kernel/locking/mutex.c:603
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
 __pipe_lock fs/pipe.c:103 [inline]
 pipe_write+0x68/0xc48 fs/pipe.c:431
 do_iter_write+0x318/0x560 fs/read_write.c:855
 vfs_iter_write+0x4c/0x6c fs/read_write.c:896
 iter_file_splice_write+0x2a8/0x518 fs/splice.c:686
 do_splice_from fs/splice.c:764 [inline]
 do_splice+0x8b8/0xc00 fs/splice.c:1074
 __do_splice fs/splice.c:1139 [inline]
 __do_sys_splice fs/splice.c:1346 [inline]
 __se_sys_splice fs/splice.c:1328 [inline]
 __arm64_sys_splice+0x2f8/0x574 fs/splice.c:1328
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
 el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581