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: 14 Comm: ksoftirqd/0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 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:ffffc900000ef840 EFLAGS: 00010046 RAX: 0000000000000060 RBX: ffffffff87b09b41 RCX: ffffffff8f038990 RDX: 0000000000000000 RSI: 0000000000000300 RDI: ffffffff87b09b40 RBP: 0000000000000026 R08: 0000000000000001 R09: 0000000000000000 R10: ffff88810bfb4020 R11: 0000000000000001 R12: 0000000000000301 R13: dffffc0000000000 R14: 0000000000000b50 R15: ffffffff8eff8638 FS: 0000000000000000(0000) GS:ffff8882686a5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000001171a6000 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+0x1b1/0x370 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:166 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:1930 [inline] __hrtimer_run_queues+0x470/0xa00 kernel/time/hrtimer.c:1994 hrtimer_run_softirq+0x17d/0x2c0 kernel/time/hrtimer.c:2011 handle_softirqs+0x1dd/0x9e0 kernel/softirq.c:622 run_ksoftirqd kernel/softirq.c:1076 [inline] run_ksoftirqd+0x38/0x60 kernel/softirq.c:1068 smpboot_thread_fn+0x3d3/0xaa0 kernel/smpboot.c:160 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x69a/0xc80 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 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:ffffc900000ef840 EFLAGS: 00010046 RAX: 0000000000000060 RBX: ffffffff87b09b41 RCX: ffffffff8f038990 RDX: 0000000000000000 RSI: 0000000000000300 RDI: ffffffff87b09b40 RBP: 0000000000000026 R08: 0000000000000001 R09: 0000000000000000 R10: ffff88810bfb4020 R11: 0000000000000001 R12: 0000000000000301 R13: dffffc0000000000 R14: 0000000000000b50 R15: ffffffff8eff8638 FS: 0000000000000000(0000) GS:ffff8882686a5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000001171a6000 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