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: 2975 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:strcmp+0x5b/0xb0 lib/string.c:284
Code: fa 48 c1 e8 03 83 e2 07 42 0f b6 04 28 38 d0 7f 04 84 c0 75 58 48 89 f0 48 89 f2 0f b6 6b ff 4c 8d 66 01 48 c1 e8 03 83 e2 07 <42> 0f b6 04 28 38 d0 7f 04 84 c0 75 2c 41 3a 6c 24 ff 74 ae 19 c0
RSP: 0018:ffffc900000079d8 EFLAGS: 00010046
RAX: 0000000000000060 RBX: ffffffff878ea501 RCX: ffffffff8ed5f5a0
RDX: 0000000000000000 RSI: 0000000000000300 RDI: ffffffff878ea500
RBP: 0000000000000026 R08: 0000000000000001 R09: 0000000000000000
R10: ffff888109fd0020 R11: 0000000000000001 R12: 0000000000000301
R13: dffffc0000000000 R14: 0000000000000496 R15: ffffffff8ed33428
FS:  000055556c40c500(0000) GS:ffff88826896a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f048b7bba8 CR3: 0000000124cea000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 count_matching_names kernel/locking/lockdep.c:878 [inline]
 register_lock_class+0x2cb/0x560 kernel/locking/lockdep.c:1344
 __lock_acquire+0x3cb/0x2630 kernel/locking/lockdep.c:5112
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x17c/0x330 kernel/locking/lockdep.c:5825
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
 complete_with_flags kernel/sched/completion.c:25 [inline]
 complete+0x1d/0x200 kernel/sched/completion.c:52
 transfer drivers/usb/gadget/udc/dummy_hcd.c:1523 [inline]
 dummy_timer+0x11e2/0x3670 drivers/usb/gadget/udc/dummy_hcd.c:1979
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x516/0x990 kernel/time/hrtimer.c:1841
 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1858
 handle_softirqs+0x1dd/0x8f0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xed/0x150 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0x8f/0xb0 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:lock_acquire+0x5e/0x330 kernel/locking/lockdep.c:5872
Code: 05 7b 34 3d 0b 83 f8 07 0f 87 a4 02 00 00 48 0f a3 05 06 aa 3e 09 0f 82 6f 02 00 00 8b 35 9e b6 3e 09 85 f6 0f 85 8a 00 00 00 <48> 8b 44 24 30 65 48 2b 05 1d 34 3d 0b 0f 85 b8 02 00 00 48 83 c4
RSP: 0018:ffffc900018df428 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000007
RDX: 0000000000000000 RSI: ffffffff88dcbbf7 RDI: ffffffff878e97a0
RBP: ffffffff894da2e0 R08: 00000000332790de R09: 000000000000001a
R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock_sched include/linux/rcupdate.h:958 [inline]
 pfn_valid include/linux/mmzone.h:2183 [inline]
 page_table_check_set+0x6b/0xa10 mm/page_table_check.c:105
 __page_table_check_ptes_set+0x1db/0x230 mm/page_table_check.c:212
 page_table_check_ptes_set include/linux/page_table_check.h:76 [inline]
 set_ptes include/linux/pgtable.h:292 [inline]
 __copy_present_ptes mm/memory.c:1102 [inline]
 copy_present_ptes+0xc84/0x44b0 mm/memory.c:1181
 copy_pte_range mm/memory.c:1304 [inline]
 copy_pmd_range mm/memory.c:1392 [inline]
 copy_pud_range mm/memory.c:1429 [inline]
 copy_p4d_range mm/memory.c:1453 [inline]
 copy_page_range+0xe0b/0x25e0 mm/memory.c:1535
 dup_mmap+0xbb3/0x1c30 mm/mmap.c:1827
 dup_mm kernel/fork.c:1529 [inline]
 copy_mm kernel/fork.c:1581 [inline]
 copy_process+0x718c/0x77a0 kernel/fork.c:2221
 kernel_clone+0xfc/0x930 kernel/fork.c:2651
 __do_sys_clone+0xd9/0x120 kernel/fork.c:2792
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x570 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fea1aea50d2
Code: 89 e7 e8 b1 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00
RSP: 002b:00007fffaf888280 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fffaf888280 RCX: 00007fea1aea50d2
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007fffaf88840c R08: 0000000000000000 R09: 0000000000000001
R10: 000055556c40c7d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 0000000000030573 R15: 00007fffaf888460
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:strcmp+0x5b/0xb0 lib/string.c:284
Code: fa 48 c1 e8 03 83 e2 07 42 0f b6 04 28 38 d0 7f 04 84 c0 75 58 48 89 f0 48 89 f2 0f b6 6b ff 4c 8d 66 01 48 c1 e8 03 83 e2 07 <42> 0f b6 04 28 38 d0 7f 04 84 c0 75 2c 41 3a 6c 24 ff 74 ae 19 c0
RSP: 0018:ffffc900000079d8 EFLAGS: 00010046
RAX: 0000000000000060 RBX: ffffffff878ea501 RCX: ffffffff8ed5f5a0
RDX: 0000000000000000 RSI: 0000000000000300 RDI: ffffffff878ea500
RBP: 0000000000000026 R08: 0000000000000001 R09: 0000000000000000
R10: ffff888109fd0020 R11: 0000000000000001 R12: 0000000000000301
R13: dffffc0000000000 R14: 0000000000000496 R15: ffffffff8ed33428
FS:  000055556c40c500(0000) GS:ffff88826896a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f048b7bba8 CR3: 0000000124cea000 CR4: 00000000003506f0
----------------
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 58                	jne    0x6d
  15:	48 89 f0             	mov    %rsi,%rax
  18:	48 89 f2             	mov    %rsi,%rdx
  1b:	0f b6 6b ff          	movzbl -0x1(%rbx),%ebp
  1f:	4c 8d 66 01          	lea    0x1(%rsi),%r12
  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 2c                	jne    0x63
  37:	41 3a 6c 24 ff       	cmp    -0x1(%r12),%bpl
  3c:	74 ae                	je     0xffffffec
  3e:	19 c0                	sbb    %eax,%eax