general protection fault, probably for non-canonical address 0xdffffc0000000040: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000200-0x0000000000000207]
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.6.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
RIP: 0010:strcmp+0x5b/0xb0 lib/string.c:282
Code: fa 48 c1 e8 03 83 e2 07 42 0f b6 04 28 38 d0 7f 04 84 c0 75 50 0f b6 6b ff 4c 8d 66 01 48 89 f0 48 89 f2 48 c1 e8 03 83 e2 07 <42> 0f b6 04 28 38 d0 7f 04 84 c0 75 24 41 3a 6c 24 ff 74 ae 19 c0
RSP: 0018:ffffc900000076c8 EFLAGS: 00010046
RAX: 0000000000000040 RBX: ffffffff86a658e1 RCX: ffffffff8b74a3e0
RDX: 0000000000000000 RSI: 0000000000000200 RDI: ffffffff86a658e0
RBP: 0000000000000066 R08: ffffffff8b74a3f0 R09: dffffc0000000000
R10: ffffffff8b74a3e0 R11: 0000000000000100 R12: 0000000000000201
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000200
FS:  0000000000000000(0000) GS:ffff8881f6600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb8fc48dd58 CR3: 000000011a68d000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 count_matching_names kernel/locking/lockdep.c:873 [inline]
 register_lock_class+0x6f1/0x1320 kernel/locking/lockdep.c:1332
 __lock_acquire+0x13c/0x5de0 kernel/locking/lockdep.c:5013
 lock_acquire kernel/locking/lockdep.c:5753 [inline]
 lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5718
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162
 complete_with_flags kernel/sched/completion.c:20 [inline]
 complete+0x1d/0x200 kernel/sched/completion.c:47
 transfer drivers/usb/gadget/udc/dummy_hcd.c:1515 [inline]
 dummy_timer+0x1271/0x35f0 drivers/usb/gadget/udc/dummy_hcd.c:1971
 call_timer_fn+0x19e/0x580 kernel/time/timer.c:1700
 expire_timers kernel/time/timer.c:1751 [inline]
 __run_timers+0x764/0xb10 kernel/time/timer.c:2022
 run_timer_softirq+0x58/0xd0 kernel/time/timer.c:2035
 __do_softirq+0x20b/0x94e kernel/softirq.c:553
 invoke_softirq kernel/softirq.c:427 [inline]
 __irq_exit_rcu kernel/softirq.c:632 [inline]
 irq_exit_rcu+0xa7/0x110 kernel/softirq.c:644
 sysvec_apic_timer_interrupt+0x8e/0xb0 arch/x86/kernel/apic/apic.c:1074
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline]
RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:72 [inline]
RIP: 0010:acpi_safe_halt+0x1b/0x20 drivers/acpi/processor_idle.c:113
Code: ed c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 65 48 8b 04 25 00 ab 03 00 48 8b 00 a8 08 75 0c 66 90 0f 00 2d c7 fc 67 00 fb f4 <fa> c3 0f 1f 00 0f b6 47 08 3c 01 74 0b 3c 02 74 05 8b 7f 04 eb 9f
RSP: 0018:ffffffff87c07d68 EFLAGS: 00000246
RAX: 0000000000004000 RBX: 0000000000000001 RCX: ffffffff8646f8fe
RDX: 0000000000000001 RSI: ffff888107661000 RDI: ffff888107661064
RBP: ffff888107661064 R08: 0000000000000001 R09: ffffed103ecc6d75
R10: ffff8881f6636bab R11: 0000000000000000 R12: ffff888105ef2000
R13: ffffffff882fc040 R14: 0000000000000000 R15: 0000000000000000
 acpi_idle_enter+0xc5/0x160 drivers/acpi/processor_idle.c:707
 cpuidle_enter_state+0x82/0x500 drivers/cpuidle/cpuidle.c:267
 cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:388
 cpuidle_idle_call kernel/sched/idle.c:215 [inline]
 do_idle+0x315/0x3f0 kernel/sched/idle.c:282
 cpu_startup_entry+0x50/0x60 kernel/sched/idle.c:380
 rest_init+0x16f/0x2b0 init/main.c:726
 arch_call_rest_init+0x13/0x30 init/main.c:823
 start_kernel+0x39a/0x470 init/main.c:1068
 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:556
 x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:537
 secondary_startup_64_no_verify+0x166/0x16b
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:strcmp+0x5b/0xb0 lib/string.c:282
Code: fa 48 c1 e8 03 83 e2 07 42 0f b6 04 28 38 d0 7f 04 84 c0 75 50 0f b6 6b ff 4c 8d 66 01 48 89 f0 48 89 f2 48 c1 e8 03 83 e2 07 <42> 0f b6 04 28 38 d0 7f 04 84 c0 75 24 41 3a 6c 24 ff 74 ae 19 c0
RSP: 0018:ffffc900000076c8 EFLAGS: 00010046
RAX: 0000000000000040 RBX: ffffffff86a658e1 RCX: ffffffff8b74a3e0
RDX: 0000000000000000 RSI: 0000000000000200 RDI: ffffffff86a658e0
RBP: 0000000000000066 R08: ffffffff8b74a3f0 R09: dffffc0000000000
R10: ffffffff8b74a3e0 R11: 0000000000000100 R12: 0000000000000201
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000200
FS:  0000000000000000(0000) GS:ffff8881f6600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb8fc48dd58 CR3: 000000011a68d000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	fa                   	cli
   1:	48 c1 e8 03          	shr    $0x3,%rax
   5:	83 e2 07             	and    $0x7,%edx
   8:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax
   d:	38 d0                	cmp    %dl,%al
   f:	7f 04                	jg     0x15
  11:	84 c0                	test   %al,%al
  13:	75 50                	jne    0x65
  15:	0f b6 6b ff          	movzbl -0x1(%rbx),%ebp
  19:	4c 8d 66 01          	lea    0x1(%rsi),%r12
  1d:	48 89 f0             	mov    %rsi,%rax
  20:	48 89 f2             	mov    %rsi,%rdx
  23:	48 c1 e8 03          	shr    $0x3,%rax
  27:	83 e2 07             	and    $0x7,%edx
* 2a:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax <-- trapping instruction
  2f:	38 d0                	cmp    %dl,%al
  31:	7f 04                	jg     0x37
  33:	84 c0                	test   %al,%al
  35:	75 24                	jne    0x5b
  37:	41 3a 6c 24 ff       	cmp    -0x1(%r12),%bpl
  3c:	74 ae                	je     0xffffffec
  3e:	19 c0                	sbb    %eax,%eax