[syzbot] [usb?] INFO: trying to register non-static key in u_audio_get_playback_srate

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    dcb68831eac7 Merge tag 'block-7.2-20260815' of git://git.k..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10eed6c6580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4c9eb8e593cf8c5c
dashboard link: https://syzkaller.appspot.com/bug?extid=e1d0e66badecc32d45eb
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/1174a1aaa938/disk-dcb68831.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c14ec1120394/vmlinux-dcb68831.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5971a3555672/bzImage-dcb68831.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e1d0e66badecc32d45eb@xxxxxxxxxxxxxxxxxxxxxxxxx

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: 29 Comm: ktimers/1 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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+0xab/0x2ce0 kernel/locking/lockdep.c:5112
 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
 rt_spin_lock+0x83/0x400 kernel/locking/spinlock_rt.c:56
 spin_lock include/linux/spinlock_rt.h:45 [inline]
 u_audio_get_playback_srate+0x50/0xd0 drivers/usb/gadget/function/u_audio.c:579
 in_rq_cur drivers/usb/gadget/function/f_uac2.c:1537 [inline]
 ac_rq_in drivers/usb/gadget/function/f_uac2.c:1696 [inline]
 setup_rq_inf drivers/usb/gadget/function/f_uac2.c:1824 [inline]
 afunc_setup+0x591/0x2100 drivers/usb/gadget/function/f_uac2.c:1845
 configfs_composite_setup+0xbd/0x100 drivers/usb/gadget/configfs.c:1877
 v_timer+0xd8b/0x2520 drivers/usb/usbip/vudc_transfer.c:378
 call_timer_fn+0x192/0x5e0 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1799 [inline]
 __run_timers kernel/time/timer.c:2374 [inline]
 __run_timer_base+0x67b/0x9b0 kernel/time/timer.c:2386
 run_timer_base kernel/time/timer.c:2395 [inline]
 run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405
 handle_softirqs+0x1d9/0x6c0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 run_ktimerd+0x69/0x100 kernel/softirq.c:1151
 smpboot_thread_fn+0x57c/0xa80 kernel/smpboot.c:160
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
dummy_hcd dummy_hcd.0: timer fired with no URBs pending?


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