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: 21219 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
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: 0000:ffffc900001a89d8 EFLAGS: 00010046
RAX: 0000000000000060 RBX: ffffffff878ea501 RCX: ffffffff8ed6eed8
RDX: 0000000000000000 RSI: 0000000000000300 RDI: ffffffff878ea500
RBP: 0000000000000026 R08: 0000000000000001 R09: 0000000000000000
R10: ffff88810a330020 R11: 0000000000000001 R12: 0000000000000301
R13: dffffc0000000000 R14: 0000000000000a55 R15: ffffffff8ed338d8
FS: 000055557240b500(0000) GS:ffff888268a6a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f18d0e9d558 CR3: 0000000151162000 CR4: 00000000003506f0
Call Trace:
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
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
Code: 26 0b 55 00 48 89 df 5b e9 4d 4b 59 00 be 03 00 00 00 5b e9 92 1e 0e 01 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 65 8b 05 25 24 1a 0b 48 8b 34 24 65 48 8b 15 01 24 1a
RSP: 0000:ffffc9000c47faa8 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 000000000013889d RCX: ffffffff8217fbff
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff8881126cba80
RBP: 0000000080000001 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000008
R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000000
page_table_check_set+0x1bd/0xa10 mm/page_table_check.c:108
__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]
wp_page_copy mm/memory.c:3789 [inline]
do_wp_page+0x22ba/0x39b0 mm/memory.c:4180
handle_pte_fault mm/memory.c:6289 [inline]
__handle_mm_fault+0xea8/0x2d30 mm/memory.c:6411
handle_mm_fault+0x36d/0xa20 mm/memory.c:6580
do_user_addr_fault+0x5ae/0x11d0 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x66/0xc0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f18d00e5b69
Code: 7a db 00 48 89 05 f7 79 db 00 49 8b 86 c8 02 00 00 66 49 0f 6e c7 66 48 0f 6e cb 49 8b 96 c0 02 00 00 66 0f 6c c0 66 0f 6c c9 <48> 89 42 08 48 89 10 31 c0 0f 11 0d e7 79 db 00 0f 11 05 d0 79 db
RSP: 002b:00007ffefb3e1e50 EFLAGS: 00010246
RAX: 00007f18d0e9d550 RBX: 00007f18d0e9d560 RCX: 00007f18d008d667
RDX: 00007f18d0e9d550 RSI: 00007ffefb3e1e20 RDI: 000055557240b500
RBP: 00007ffefb3e1f01 R08: 00007f18d0e98060 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f18d0e9d550 R14: 000055557240b500 R15: 00007f18d0e9d550
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: 0000:ffffc900001a89d8 EFLAGS: 00010046
RAX: 0000000000000060 RBX: ffffffff878ea501 RCX: ffffffff8ed6eed8
RDX: 0000000000000000 RSI: 0000000000000300 RDI: ffffffff878ea500
RBP: 0000000000000026 R08: 0000000000000001 R09: 0000000000000000
R10: ffff88810a330020 R11: 0000000000000001 R12: 0000000000000301
R13: dffffc0000000000 R14: 0000000000000a55 R15: ffffffff8ed338d8
FS: 000055557240b500(0000) GS:ffff888268a6a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f18d0e9d558 CR3: 0000000151162000 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