[syzbot] [media?] INFO: trying to register non-static key in as102_dvb_dmx_start_feed

syzbot
2026-03-26T05:13:25Z

Hello,

syzbot found the following issue on:

HEAD commit: bbeb83d3182a Merge tag 'kbuild-fixes-7.0-3' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1749d6da580000
kernel config: https://syzkaller.appspot.com/x/.config?x=45cb3c58fd963c27
dashboard link: https://syzkaller.appspot.com/bug?extid=3f395d8da879a58fb019
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=151e5e16580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11334b52580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/fed7fabd5bd6/disk-bbeb83d3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3776359aa4d4/vmlinux-bbeb83d3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6ea274e547d3/bzImage-bbeb83d3.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3f395d8da879a58fb019@syzkaller.appspotmail.com

INFO: trying to register non-static key.
The code is fine but needs lockdep annotation, or maybe
you didn't initialize this object before use?
turning off the locking correctness validator.
CPU: 1 UID: 0 PID: 6076 Comm: syz.1.43 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
assign_lock_key+0x133/0x150 kernel/locking/lockdep.c:984
register_lock_class+0xcc/0x2e0 kernel/locking/lockdep.c:1299
__lock_acquire+0xad/0x2cf0 kernel/locking/lockdep.c:5112
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__mutex_lock_common kernel/locking/rtmutex_api.c:533 [inline]
mutex_lock_interruptible_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:566
as102_dvb_dmx_start_feed+0x70/0x290 drivers/media/usb/as102/as102_drv.c:139
dmx_section_feed_start_filtering+0x518/0x6c0 drivers/media/dvb-core/dvb_demux.c:977
dvb_dmxdev_filter_start+0xcf4/0x10e0 drivers/media/dvb-core/dmxdev.c:760
dvb_demux_do_ioctl+0x473/0x540 drivers/media/dvb-core/dmxdev.c:1083
dvb_usercopy+0x199/0x2e0 drivers/media/dvb-core/dvbdev.c:996
dvb_demux_ioctl+0x29/0x40 drivers/media/dvb-core/dmxdev.c:1201
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xff/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: 0033:0x7fa44073c799
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:00007fffd63530b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa4409b5fa0 RCX: 00007fa44073c799
RDX: 0000200000000200 RSI: 00000000403c6f2b RDI: 0000000000000004
RBP: 00007fa4407d2c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa4409b5fac R14: 00007fa4409b5fa0 R15: 00007fa4409b5fa0
</TASK>

---
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