Oops: general protection fault, probably for non-canonical address 0xdffffc0000000060: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000300-0x0000000000000307]
CPU: 0 UID: 0 PID: 8970 Comm: syz.3.556 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:strcmp+0x3c/0xc0 lib/string.c:284
Code: 00 fc ff df 45 31 f6 4a 8d 04 37 48 89 c1 48 c1 e9 03 0f b6 0c 19 84 c9 75 2c 42 0f b6 2c 37 4a 8d 04 36 48 89 c1 48 c1 e9 03 <0f> b6 0c 19 84 c9 75 33 42 0f b6 0c 36 40 38 cd 75 48 49 ff c6 40
RSP: 0018:ffffc900000077e0 EFLAGS: 00010006
RAX: 0000000000000300 RBX: dffffc0000000000 RCX: 0000000000000060
RDX: 0000000000000001 RSI: 0000000000000300 RDI: ffffffff8be257a0
RBP: 0000000000000026 R08: 0000000000000001 R09: ffff888144bec020
R10: dffffc0000000000 R11: ffffed100ec4c802 R12: ffffffff9371f3d8
R13: ffffffff964ec528 R14: 0000000000000000 R15: ffffffff936eb3e0
FS:  00007fce470dc6c0(0000) GS:ffff8881259c1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffde9d4eff8 CR3: 0000000076f82000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 count_matching_names+0x57/0x90 kernel/locking/lockdep.c:878
 register_lock_class+0x200/0x2e0 kernel/locking/lockdep.c:1344
 __lock_acquire+0xae/0x2cf0 kernel/locking/lockdep.c:5112
 lock_acquire+0x107/0x340 kernel/locking/lockdep.c:5868
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162
 complete_with_flags kernel/sched/completion.c:25 [inline]
 complete+0x28/0x1b0 kernel/sched/completion.c:52
 transfer drivers/usb/gadget/udc/dummy_hcd.c:1523 [inline]
 dummy_timer+0x214f/0x45b0 drivers/usb/gadget/udc/dummy_hcd.c:1979
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x51c/0xc30 kernel/time/hrtimer.c:1841
 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1858
 handle_softirqs+0x22b/0x7c0 kernel/softirq.c:626
 __do_softirq kernel/softirq.c:660 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x60/0x150 kernel/softirq.c:727
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:743
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:syscall_enter_from_user_mode_work include/linux/entry-common.h:77 [inline]
RIP: 0010:syscall_enter_from_user_mode include/linux/entry-common.h:109 [inline]
RIP: 0010:do_syscall_64+0xb5/0xf80 arch/x86/entry/syscall_64.c:90
Code: 00 48 8b 7d 08 48 89 7b 08 e8 27 82 00 00 0f 1f 44 00 00 0f 1f 44 00 00 90 e8 b7 e3 62 f6 90 90 e8 60 e3 62 f6 fb 49 8b 57 08 <f6> c2 3f 74 0e 4c 89 f7 4c 89 ee e8 db fc 44 f6 49 89 c4 90 90 41
RSP: 0018:ffffc9000c98fef0 EFLAGS: 00000206
RAX: 000000000000114d RBX: ffffc9000c98fef0 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8daae6e9 RDI: ffffffff8be250e0
RBP: ffffc9000c98ff38 R08: ffffffff8fc3de77 R09: 1ffffffff1f87bce
R10: dffffc0000000000 R11: fffffbfff1f87bcf R12: 00000000000000e6
R13: 00000000000000e6 R14: ffffc9000c98ff48 R15: ffff88802c28bc80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fce461c1785
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 f6 54 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 4f 55 ff ff 48 8b 04 24 48 83 c4 28 f7 d8
RSP: 002b:00007fce470daf60 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fce461c1785
RDX: 00007fce470dafa0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000006 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 000000000000000c R14: 00007fce463e5fa0 R15: 00007ffde9d4ffc8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:strcmp+0x3c/0xc0 lib/string.c:284
Code: 00 fc ff df 45 31 f6 4a 8d 04 37 48 89 c1 48 c1 e9 03 0f b6 0c 19 84 c9 75 2c 42 0f b6 2c 37 4a 8d 04 36 48 89 c1 48 c1 e9 03 <0f> b6 0c 19 84 c9 75 33 42 0f b6 0c 36 40 38 cd 75 48 49 ff c6 40
RSP: 0018:ffffc900000077e0 EFLAGS: 00010006
RAX: 0000000000000300 RBX: dffffc0000000000 RCX: 0000000000000060
RDX: 0000000000000001 RSI: 0000000000000300 RDI: ffffffff8be257a0
RBP: 0000000000000026 R08: 0000000000000001 R09: ffff888144bec020
R10: dffffc0000000000 R11: ffffed100ec4c802 R12: ffffffff9371f3d8
R13: ffffffff964ec528 R14: 0000000000000000 R15: ffffffff936eb3e0
FS:  00007fce470dc6c0(0000) GS:ffff8881259c1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffde9d4eff8 CR3: 0000000076f82000 CR4: 00000000003526f0
----------------
Code disassembly (best guess), 4 bytes skipped:
   0:	45 31 f6             	xor    %r14d,%r14d
   3:	4a 8d 04 37          	lea    (%rdi,%r14,1),%rax
   7:	48 89 c1             	mov    %rax,%rcx
   a:	48 c1 e9 03          	shr    $0x3,%rcx
   e:	0f b6 0c 19          	movzbl (%rcx,%rbx,1),%ecx
  12:	84 c9                	test   %cl,%cl
  14:	75 2c                	jne    0x42
  16:	42 0f b6 2c 37       	movzbl (%rdi,%r14,1),%ebp
  1b:	4a 8d 04 36          	lea    (%rsi,%r14,1),%rax
  1f:	48 89 c1             	mov    %rax,%rcx
  22:	48 c1 e9 03          	shr    $0x3,%rcx
* 26:	0f b6 0c 19          	movzbl (%rcx,%rbx,1),%ecx <-- trapping instruction
  2a:	84 c9                	test   %cl,%cl
  2c:	75 33                	jne    0x61
  2e:	42 0f b6 0c 36       	movzbl (%rsi,%r14,1),%ecx
  33:	40 38 cd             	cmp    %cl,%bpl
  36:	75 48                	jne    0x80
  38:	49 ff c6             	inc    %r14
  3b:	40                   	rex