[syzbot] [media?] WARNING in az6007_i2c_xfer (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 80234b5ab240 Merge tag 'rproc-v7.0-fixes' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14bc775a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=779072223d02a312
dashboard link: https://syzkaller.appspot.com/bug?extid=cb60cba6678dbc243930
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/53f504b3f646/disk-80234b5a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/56d033e102f9/vmlinux-80234b5a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/93e75ca78ad3/bzImage-80234b5a.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+cb60cb...@syzkaller.appspotmail.com

usb read operation failed. (-71)
------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(__owner_task(owner) != get_current())
WARNING: kernel/locking/mutex.c:949 at __mutex_unlock_slowpath+0x218/0x7d0 kernel/locking/mutex.c:949, CPU#0: syz.0.9868/26313
Modules linked in:
CPU: 0 UID: 0 PID: 26313 Comm: syz.0.9868 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/27/2026
RIP: 0010:__mutex_unlock_slowpath+0x21f/0x7d0 kernel/locking/mutex.c:949
Code: 2e 48 8b 44 24 10 42 0f b6 04 28 84 c0 0f 85 d3 00 00 00 83 3d d5 73 62 04 00 75 13 48 8d 3d 78 87 65 04 48 c7 c6 40 e9 cc 8b <67> 48 0f b9 3a 90 48 8b 54 24 10 e9 2d ff ff ff 48 89 54 24 10 90
RSP: 0018:ffffc90003907ac0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffc90003907b60 RCX: 0000000000080000
RDX: ffffc9000c799000 RSI: ffffffff8bcce940 RDI: ffffffff9014d270
RBP: ffffc90003907bd8 R08: ffffffff9011bec3 R09: 1ffffffff20237d8
R10: dffffc0000000000 R11: fffffbfff20237d9 R12: 1ffff92000720f60
R13: dffffc0000000000 R14: 1ffffffff344e690 R15: ffff88807d32c000
FS: 00007f298a8646c0(0000) GS:ffff888125463000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3028ed CR3: 00000000348a2000 CR4: 00000000003526f0
Call Trace:
<TASK>
az6007_i2c_xfer+0xb65/0xb90 drivers/media/usb/dvb-usb-v2/az6007.c:827
__i2c_transfer+0x79a/0x2020 drivers/i2c/i2c-core-base.c:-1
i2c_transfer+0x1cc/0x2d0 drivers/i2c/i2c-core-base.c:2317
i2cdev_ioctl_rdwr+0x460/0x740 drivers/i2c/i2c-dev.c:306
i2cdev_ioctl+0x6a5/0x880 drivers/i2c/i2c-dev.c:467
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f298999c799
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:00007f298a864028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2989c15fa0 RCX: 00007f298999c799
RDX: 0000200000000340 RSI: 0000000000000707 RDI: 0000000000000004
RBP: 00007f2989a32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2989c16038 R14: 00007f2989c15fa0 R15: 00007f2989d3fa48
</TASK>
----------------
Code disassembly (best guess):
0: 2e 48 8b 44 24 10 cs mov 0x10(%rsp),%rax
6: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax
b: 84 c0 test %al,%al
d: 0f 85 d3 00 00 00 jne 0xe6
13: 83 3d d5 73 62 04 00 cmpl $0x0,0x46273d5(%rip) # 0x46273ef
1a: 75 13 jne 0x2f
1c: 48 8d 3d 78 87 65 04 lea 0x4658778(%rip),%rdi # 0x465879b
23: 48 c7 c6 40 e9 cc 8b mov $0xffffffff8bcce940,%rsi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 90 nop
30: 48 8b 54 24 10 mov 0x10(%rsp),%rdx
35: e9 2d ff ff ff jmp 0xffffff67
3a: 48 89 54 24 10 mov %rdx,0x10(%rsp)
3f: 90 nop


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