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: 7688 Comm: syz.1.238 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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 28 42 0f b6 2c 37 4a 8d 04 36 48 89 c1 48 c1 e9 03 <0f> b6 0c 19 84 c9 75 2f 42 3a 2c 36 75 48 49 ff c6 40 84 ed 75 c7
RSP: 0018:ffffc90000007888 EFLAGS: 00010006
RAX: 0000000000000300 RBX: dffffc0000000000 RCX: 0000000000000060
RDX: 0000000000000001 RSI: 0000000000000300 RDI: ffffffff8c4a68c0
RBP: 0000000000000026 R08: 0000000000000001 R09: ffff88802a59c020
R10: dffffc0000000000 R11: ffffed100f1c6402 R12: ffffffff940ff400
R13: ffffffff96ecd7f8 R14: 0000000000000000 R15: ffffffff940cb340
FS: 00007f19c79a76c0(0000) GS:ffff888124de2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f19c6be7c80 CR3: 00000000364fc000 CR4: 00000000003526f0
Call Trace:
count_matching_names+0x57/0x90 kernel/locking/lockdep.c:878
register_lock_class+0x200/0x2e0 kernel/locking/lockdep.c:1344
__lock_acquire+0xad/0x2cf0 kernel/locking/lockdep.c:5112
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [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+0x2162/0x45e0 drivers/usb/gadget/udc/dummy_hcd.c:1979
__run_hrtimer kernel/time/hrtimer.c:1930 [inline]
__hrtimer_run_queues+0x3d1/0xa70 kernel/time/hrtimer.c:1994
hrtimer_run_softirq+0x17a/0x240 kernel/time/hrtimer.c:2011
handle_softirqs+0x22a/0x870 kernel/softirq.c:626
__do_softirq kernel/softirq.c:660 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xca/0x220 kernel/softirq.c:739
irq_exit_rcu+0x9/0x30 kernel/softirq.c:756
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:194
Code: f7 e8 9d 8f e1 f5 f7 c3 00 02 00 00 74 05 e8 50 18 0d f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 44 26 d3 f5 65 8b 05 9d e7 a1 07 85 c0 74 18 5b 41 5e e9 81 48
RSP: 0018:ffffc9000632f928 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000246 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8e257436 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff905441f7 R09: 1ffffffff20a883e
R10: dffffc0000000000 R11: fffffbfff20a883f R12: dffffc0000000000
R13: 1ffff110054b38cc R14: ffff88802a59c000 R15: ffff88802a59c658
spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]
dummy_queue+0x6e4/0x8d0 drivers/usb/gadget/udc/dummy_hcd.c:744
usb_ep_queue+0xf1/0x3f0 drivers/usb/gadget/udc/core.c:303
raw_process_ep_io+0x5e4/0xd90 drivers/usb/gadget/legacy/raw_gadget.c:1114
raw_ioctl_ep_write drivers/usb/gadget/legacy/raw_gadget.c:1153 [inline]
raw_ioctl+0x252c/0x41c0 drivers/usb/gadget/legacy/raw_gadget.c:1325
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f19c6b9a1cb
Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
RSP: 002b:00007f19c79a5f60 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f19c6b9a1cb
RDX: 00007f19c79a5fe0 RSI: 0000000040085507 RDI: 0000000000000006
RBP: 0000000000000006 R08: 00007f19c6f30320 R09: 0000000000000000
R10: 0000000000000006 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000c R14: 00007f19c6e05fa0 R15: 00007fff9da55ae8
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 28 42 0f b6 2c 37 4a 8d 04 36 48 89 c1 48 c1 e9 03 <0f> b6 0c 19 84 c9 75 2f 42 3a 2c 36 75 48 49 ff c6 40 84 ed 75 c7
RSP: 0018:ffffc90000007888 EFLAGS: 00010006
RAX: 0000000000000300 RBX: dffffc0000000000 RCX: 0000000000000060
RDX: 0000000000000001 RSI: 0000000000000300 RDI: ffffffff8c4a68c0
RBP: 0000000000000026 R08: 0000000000000001 R09: ffff88802a59c020
R10: dffffc0000000000 R11: ffffed100f1c6402 R12: ffffffff940ff400
R13: ffffffff96ecd7f8 R14: 0000000000000000 R15: ffffffff940cb340
FS: 00007f19c79a76c0(0000) GS:ffff888124de2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f19c6be7c80 CR3: 00000000364fc000 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 28 jne 0x3e
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 2f jne 0x5d
2e: 42 3a 2c 36 cmp (%rsi,%r14,1),%bpl
32: 75 48 jne 0x7c
34: 49 ff c6 inc %r14
37: 40 84 ed test %bpl,%bpl
3a: 75 c7 jne 0x3