============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.3.327/7068 is trying to acquire lock:
ffff8880252feb30 (&chip->mutex){+.+.}-{3:3}, at: snd_usb_endpoint_close+0x3c/0x4c0 sound/usb/endpoint.c:964

but task is already holding lock:
ffff8880252feb30 (&chip->mutex){+.+.}-{3:3}, at: snd_usb_endpoint_set_params+0x6d/0x2b40 sound/usb/endpoint.c:1362

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

       CPU0
       ----
  lock(&chip->mutex);
  lock(&chip->mutex);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

3 locks held by syz.3.327/7068:
 #0: ffff88805e5344e0 (&runtime->oss.params_lock){+.+.}-{3:3}, at: snd_pcm_oss_sync+0x2a7/0xc20 sound/core/oss/pcm_oss.c:1677
 #1: ffff88805e534238 (&runtime->buffer_mutex){+.+.}-{3:3}, at: snd_pcm_buffer_access_lock sound/core/pcm_native.c:696 [inline]
 #1: ffff88805e534238 (&runtime->buffer_mutex){+.+.}-{3:3}, at: snd_pcm_hw_params+0x163/0x1ce0 sound/core/pcm_native.c:740
 #2: ffff8880252feb30 (&chip->mutex){+.+.}-{3:3}, at: snd_usb_endpoint_set_params+0x6d/0x2b40 sound/usb/endpoint.c:1362

stack backtrace:
CPU: 0 PID: 7068 Comm: syz.3.327 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
 check_deadlock kernel/locking/lockdep.c:3062 [inline]
 validate_chain kernel/locking/lockdep.c:3856 [inline]
 __lock_acquire+0x5dbc/0x7d40 kernel/locking/lockdep.c:5137
 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
 __mutex_lock_common kernel/locking/mutex.c:603 [inline]
 __mutex_lock+0x136/0xcc0 kernel/locking/mutex.c:747
 snd_usb_endpoint_close+0x3c/0x4c0 sound/usb/endpoint.c:964
 close_endpoints sound/usb/pcm.c:454 [inline]
 snd_usb_hw_params+0x1356/0x19d0 sound/usb/pcm.c:573
 snd_pcm_hw_params+0x8a6/0x1ce0 sound/core/pcm_native.c:784
 snd_pcm_oss_change_params_locked+0x2042/0x3cf0 sound/core/oss/pcm_oss.c:976
 snd_pcm_oss_make_ready_locked sound/core/oss/pcm_oss.c:1199 [inline]
 snd_pcm_oss_sync+0x363/0xc20 sound/core/oss/pcm_oss.c:1681
 snd_pcm_oss_release+0x102/0x240 sound/core/oss/pcm_oss.c:2591
 __fput+0x234/0x970 fs/file_table.c:384
 task_work_run+0x1d4/0x260 kernel/task_work.c:245
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f752c99aeb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc22d9ad98 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffc22d9ae80 RCX: 00007f752c99aeb9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00000000000392bb R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b2ca20000 R11: 0000000000000246 R12: 00007ffc22d9aec0
R13: 00007f752cc15fac R14: 0000000000039674 R15: 00007f752cc15fa0
 </TASK>