Oops: general protection fault, probably for non-canonical address 0xdffffc0000000060: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000300-0x0000000000000307]
CPU: 1 UID: 0 PID: 23009 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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:ffffc900001a89d0 EFLAGS: 00010046
RAX: 0000000000000060 RBX: ffffffff87afe081 RCX: ffffffff8f015478
RDX: 0000000000000000 RSI: 0000000000000300 RDI: ffffffff87afe080
RBP: 0000000000000026 R08: 0000000000000001 R09: 0000000000000000
R10: ffff88810c3c4020 R11: 0000000000000001 R12: 0000000000000301
R13: dffffc0000000000 R14: 000000000000078a R15: ffffffff8efd4630
FS:  0000555562059500(0000) GS:ffff8882687c9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5f0b6956b8 CR3: 000000013e1f4000 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+0x1cf/0x380 kernel/locking/lockdep.c:5825
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [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:1527 [inline]
 dummy_timer+0x121c/0x36c0 drivers/usb/gadget/udc/dummy_hcd.c:1989
 __run_hrtimer kernel/time/hrtimer.c:1785 [inline]
 __hrtimer_run_queues+0x50e/0xa70 kernel/time/hrtimer.c:1849
 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1866
 handle_softirqs+0x1de/0x9d0 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:__sanitizer_cov_trace_pc+0xb/0x70 kernel/kcov.c:213
Code: 5b 00 be 03 00 00 00 5b e9 c2 fd 1a 01 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 8b 05 e5 73 43 0b <48> 8b 34 24 65 48 8b 15 c1 73 43 0b a9 00 01 ff 00 74 1b f6 c4 01
RSP: 0018:ffffc90006c5f388 EFLAGS: 00000202
RAX: 0000000080000002 RBX: 0000000000139f5b RCX: ffffffff821ada1a
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff88810ffa1d80
RBP: ffff888101e80000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000000
 page_ext_invalid mm/page_ext.c:249 [inline]
 lookup_page_ext+0x84/0x100 mm/page_ext.c:265
 page_ext_iter_begin include/linux/page_ext.h:133 [inline]
 page_table_check_set+0x323/0xa10 mm/page_table_check.c:113
 __page_table_check_ptes_set+0x1db/0x230 mm/page_table_check.c:215
 page_table_check_ptes_set include/linux/page_table_check.h:83 [inline]
 set_ptes include/linux/pgtable.h:413 [inline]
 __copy_present_ptes mm/memory.c:1115 [inline]
 copy_present_ptes+0xcc4/0x44f0 mm/memory.c:1194
 copy_pte_range mm/memory.c:1317 [inline]
 copy_pmd_range mm/memory.c:1405 [inline]
 copy_pud_range mm/memory.c:1442 [inline]
 copy_p4d_range mm/memory.c:1466 [inline]
 copy_page_range+0xe88/0x2760 mm/memory.c:1552
 dup_mmap+0xcb9/0x1f30 mm/mmap.c:1841
 dup_mm kernel/fork.c:1531 [inline]
 copy_mm kernel/fork.c:1583 [inline]
 copy_process+0x424b/0x7820 kernel/fork.c:2223
 kernel_clone+0xfc/0x9a0 kernel/fork.c:2653
 __do_sys_clone+0xd9/0x120 kernel/fork.c:2794
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0x7b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5f0a915292
Code: 89 e7 e8 71 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:00007fff5a71c5d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fff5a71c5d0 RCX: 00007f5f0a915292
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007fff5a71c75c R08: 0000000000000000 R09: 0000000000000001
R10: 00005555620597d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 000000000023a9aa R15: 00007fff5a71c7b0
 </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:ffffc900001a89d0 EFLAGS: 00010046
RAX: 0000000000000060 RBX: ffffffff87afe081 RCX: ffffffff8f015478
RDX: 0000000000000000 RSI: 0000000000000300 RDI: ffffffff87afe080
RBP: 0000000000000026 R08: 0000000000000001 R09: 0000000000000000
R10: ffff88810c3c4020 R11: 0000000000000001 R12: 0000000000000301
R13: dffffc0000000000 R14: 000000000000078a R15: ffffffff8efd4630
FS:  0000555562059500(0000) GS:ffff8882687c9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5f0b6956b8 CR3: 000000013e1f4000 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