[syzbot] [sound?] WARNING in snd_usb_endpoint_start/usb_submit_urb

[syzbot <syzbot+a8a8041d41f9655c601b@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    f0b9d8eb98df Merge tag 'nfsd-6.19-3' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16c5e074580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1f2b6fe1fdf1a00b
dashboard link: https://syzkaller.appspot.com/bug?extid=a8a8041d41f9655c601b
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/200586687016/disk-f0b9d8eb.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d56481335522/vmlinux-f0b9d8eb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/12cfd8855d89/bzImage-f0b9d8eb.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a8a8041d41f9655c601b@syzkaller.appspotmail.com

usb 3-1: timeout: still 3 active urbs on EP #4
------------[ cut here ]------------
URB ffff88805dd05000 submitted while active
WARNING: drivers/usb/core/urb.c:380 at usb_submit_urb+0x7b/0x18d0 drivers/usb/core/urb.c:380, CPU#1: syz.4.1023/9599
Modules linked in:
CPU: 1 UID: 0 PID: 9599 Comm: syz.4.1023 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:usb_submit_urb+0x7e/0x18d0 drivers/usb/core/urb.c:380
Code: 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 77 26 a7 fb 49 83 3e 00 74 40 e8 2c ef 44 fb 48 8d 3d e5 27 6c 08 48 89 de <67> 48 0f b9 3a b8 f0 ff ff ff eb 11 e8 11 ef 44 fb eb 05 e8 0a ef
RSP: 0018:ffffc9000cd6f5e0 EFLAGS: 00010287
RAX: ffffffff867abd04 RBX: ffff88805dd05000 RCX: 0000000000080000
RDX: ffffc9000ec48000 RSI: ffff88805dd05000 RDI: ffffffff8ee6e4f0
RBP: ffffc9000cd6f7c0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed10065221b8 R12: 0000000000000820
R13: 0000000000000000 R14: ffff88805dd05008 R15: dffffc0000000000
FS:  00007fd14e1dd6c0(0000) GS:ffff888126def000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555575be0808 CR3: 0000000036704000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 snd_usb_endpoint_start+0x8a0/0x1520 sound/usb/endpoint.c:1610
 start_endpoints+0xa1/0x280 sound/usb/pcm.c:291
 snd_usb_substream_playback_trigger+0x3e0/0x830 sound/usb/pcm.c:1711
 snd_pcm_do_start sound/core/pcm_native.c:1454 [inline]
 snd_pcm_do_drain_init+0x7d9/0xd10 sound/core/pcm_native.c:2046
 snd_pcm_action_single sound/core/pcm_native.c:1310 [inline]
 snd_pcm_action+0xe7/0x240 sound/core/pcm_native.c:1393
 snd_pcm_drain+0x261/0xdf0 sound/core/pcm_native.c:2129
 snd_pcm_oss_sync+0xf6/0x9d0 sound/core/oss/pcm_oss.c:1718
 snd_pcm_oss_release+0x102/0x250 sound/core/oss/pcm_oss.c:2573
 __fput+0x45b/0xa80 fs/file_table.c:468
 task_work_run+0x1d4/0x260 kernel/task_work.c:233
 get_signal+0x11c4/0x1310 kernel/signal.c:2807
 arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x87/0x4e0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2c1/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd14ff9f749
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd14e1dd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: 0000000000003ac5 RBX: 00007fd1501f6090 RCX: 00007fd14ff9f749
RDX: 00000000fffffcd9 RSI: 0000200000002200 RDI: 0000000000000006
RBP: 00007fd150023f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd1501f6128 R14: 00007fd1501f6090 R15: 00007ffd58df2118
 </TASK>
----------------
Code disassembly (best guess):
   0:	89 f0                	mov    %esi,%eax
   2:	48 c1 e8 03          	shr    $0x3,%rax
   6:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1)
   b:	74 08                	je     0x15
   d:	4c 89 f7             	mov    %r14,%rdi
  10:	e8 77 26 a7 fb       	call   0xfba7268c
  15:	49 83 3e 00          	cmpq   $0x0,(%r14)
  19:	74 40                	je     0x5b
  1b:	e8 2c ef 44 fb       	call   0xfb44ef4c
  20:	48 8d 3d e5 27 6c 08 	lea    0x86c27e5(%rip),%rdi        # 0x86c280c
  27:	48 89 de             	mov    %rbx,%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	b8 f0 ff ff ff       	mov    $0xfffffff0,%eax
  34:	eb 11                	jmp    0x47
  36:	e8 11 ef 44 fb       	call   0xfb44ef4c
  3b:	eb 05                	jmp    0x42
  3d:	e8                   	.byte 0xe8
  3e:	0a ef                	or     %bh,%ch


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