em28xx 1-1:0.132: No AC97 audio processor
usb 1-1: Decoder not found
em28xx 1-1:0.132: failed to create media graph
em28xx 1-1:0.132: V4L2 device video11 deregistered
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: 4798 Comm: kworker/1:4 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026
Workqueue: events request_module_async
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 assign_lock_key+0xcc/0xdc kernel/locking/lockdep.c:1028
 register_lock_class+0xf8/0x31c kernel/locking/lockdep.c:1343
 __lock_acquire+0x140/0x2b08 kernel/locking/lockdep.c:5162
 lock_acquire+0x13c/0x320 kernel/locking/lockdep.c:5942
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:155 [inline]
 _raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:181
 __wake_up_common_lock+0x30/0x78 kernel/sched/wait.c:125
 __wake_up+0x18/0x24 kernel/sched/wait.c:147
 __vb2_queue_cancel+0x248/0xa78 drivers/media/common/videobuf2/videobuf2-core.c:2244
 vb2_core_queue_release+0x34/0x13c drivers/media/common/videobuf2/videobuf2-core.c:2677
 vb2_queue_release drivers/media/common/videobuf2/videobuf2-v4l2.c:943 [inline]
 vb2_video_unregister_device+0x12c/0x1d0 drivers/media/common/videobuf2/videobuf2-v4l2.c:1279
 em28xx_v4l2_init+0x1368/0x247c drivers/media/usb/em28xx/em28xx-video.c:3097
 em28xx_init_extension+0x10c/0x1b4 drivers/media/usb/em28xx/em28xx-core.c:1248
 request_module_async+0x24/0x34 drivers/media/usb/em28xx/em28xx-cards.c:-1
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3479
 worker_thread+0x798/0xbd0 kernel/workqueue.c:3560
 kthread+0x304/0x3d4 kernel/kthread.c:436
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:854
Unable to handle kernel paging request at virtual address dfff800000000000
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
Mem abort info:
  ESR = 0x0000000096000005
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x05: level 1 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000
  CM = 0, WnR = 0, TnD = 0, TagAccess = 0
  GCS = 0, Overlay = 0, DirtyBit = 0
[dfff800000000000] address between user and kernel address ranges
Internal error: Oops: 0000000096000005 [#1]  SMP
Modules linked in:
CPU: 1 UID: 0 PID: 4798 Comm: kworker/1:4 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026
Workqueue: events request_module_async
pstate: 034000c5 (nzcv daIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : __wake_up_common+0xac/0x180 kernel/sched/wait.c:105
lr : __wake_up_common_lock+0x4c/0x78 kernel/sched/wait.c:126
sp : ffff8000953c7880
x29: ffff8000953c7880 x28: dfff800000000000 x27: dfff800000000000
x26: dfff800000000000 x25: ffff0000cf83176c x24: 0000000000000000
x23: ffff0000cf831800 x22: 0000000000000003 x21: 0000000000000000
x20: 0000000000000000 x19: 0000000000000000 x18: 00000000ffffffff
x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
x14: 0000000000000542 x13: 0000000000000001 x12: 0000000000000004
x11: ffff700012a78f00 x10: ffff700012a78f00 x9 : 0000000000000003
x8 : 0000000000000000 x7 : 0000000000000000 x6 : ffff8000804823d8
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000
x2 : 0000000000000000 x1 : 0000000000000003 x0 : ffff0000cf8317c0
Call trace:
 __wake_up_common+0xac/0x180 kernel/sched/wait.c:105 (P)
 __wake_up_common_lock+0x4c/0x78 kernel/sched/wait.c:126
 __wake_up+0x18/0x24 kernel/sched/wait.c:147
 __vb2_queue_cancel+0x248/0xa78 drivers/media/common/videobuf2/videobuf2-core.c:2244
 vb2_core_queue_release+0x34/0x13c drivers/media/common/videobuf2/videobuf2-core.c:2677
 vb2_queue_release drivers/media/common/videobuf2/videobuf2-v4l2.c:943 [inline]
 vb2_video_unregister_device+0x12c/0x1d0 drivers/media/common/videobuf2/videobuf2-v4l2.c:1279
 em28xx_v4l2_init+0x1368/0x247c drivers/media/usb/em28xx/em28xx-video.c:3097
 em28xx_init_extension+0x10c/0x1b4 drivers/media/usb/em28xx/em28xx-core.c:1248
 request_module_async+0x24/0x34 drivers/media/usb/em28xx/em28xx-cards.c:-1
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3479
 worker_thread+0x798/0xbd0 kernel/workqueue.c:3560
 kthread+0x304/0x3d4 kernel/kthread.c:436
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:854
Code: f94002f8 eb17031f 54000500 d343ff08 (387b6908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	f94002f8 	ldr	x24, [x23]
   4:	eb17031f 	cmp	x24, x23
   8:	54000500 	b.eq	0xa8  // b.none
   c:	d343ff08 	lsr	x8, x24, #3
* 10:	387b6908 	ldrb	w8, [x8, x27] <-- trapping instruction