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: 22 Comm: ksoftirqd/1 Not tainted 6.16.0-rc4-syzkaller-00314-gb4b4dbfa96de #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 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:ffffc9000017f7f8 EFLAGS: 00010046 RAX: 0000000000000060 RBX: ffffffff87691041 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000300 RDI: ffffffff87691040 RBP: 0000000000000026 R08: 0000000000000001 R09: 0000000000000001 R10: ffff8881377c000b R11: 0000000000000001 R12: 0000000000000301 R13: dffffc0000000000 R14: 0000000000000000 R15: ffffffff8e7748e8 FS: 0000000000000000(0000) GS:ffff888269262000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa2e9125d58 CR3: 000000012bb48000 CR4: 00000000003506f0 Call Trace: count_matching_names kernel/locking/lockdep.c:881 [inline] register_lock_class+0x26d/0x4c0 kernel/locking/lockdep.c:1347 __lock_acquire+0xa6/0x1c90 kernel/locking/lockdep.c:5115 lock_acquire kernel/locking/lockdep.c:5871 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828 __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:20 [inline] complete+0x1d/0x200 kernel/sched/completion.c:47 transfer drivers/usb/gadget/udc/dummy_hcd.c:1523 [inline] dummy_timer+0x1c59/0x3a30 drivers/usb/gadget/udc/dummy_hcd.c:1979 __run_hrtimer kernel/time/hrtimer.c:1761 [inline] __hrtimer_run_queues+0x1ff/0xad0 kernel/time/hrtimer.c:1825 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1842 handle_softirqs+0x208/0x8d0 kernel/softirq.c:579 run_ksoftirqd kernel/softirq.c:968 [inline] run_ksoftirqd+0x3a/0x60 kernel/softirq.c:960 smpboot_thread_fn+0x3f4/0xae0 kernel/smpboot.c:164 kthread+0x3c2/0x780 kernel/kthread.c:464 ret_from_fork+0x5b3/0x6c0 arch/x86/kernel/process.c:148 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:ffffc9000017f7f8 EFLAGS: 00010046 RAX: 0000000000000060 RBX: ffffffff87691041 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000300 RDI: ffffffff87691040 RBP: 0000000000000026 R08: 0000000000000001 R09: 0000000000000001 R10: ffff8881377c000b R11: 0000000000000001 R12: 0000000000000301 R13: dffffc0000000000 R14: 0000000000000000 R15: ffffffff8e7748e8 FS: 0000000000000000(0000) GS:ffff888269262000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa2e9125d58 CR3: 000000012bb48000 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