Oops: general protection fault, probably for non-canonical address 0xdffffc0000000060: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000300-0x0000000000000307] CPU: 0 UID: 0 PID: 2950 Comm: syz-executor Not tainted 6.14.0-rc3-syzkaller-00056-g811d22141369 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:strcmp+0x5b/0xb0 lib/string.c:277 Code: fa 48 c1 e8 03 83 e2 07 42 0f b6 04 28 38 d0 7f 04 84 c0 75 58 0f b6 6b ff 4c 8d 66 01 48 89 f0 48 89 f2 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:ffffc90000007848 EFLAGS: 00010046 RAX: 0000000000000060 RBX: ffffffff8747ce21 RCX: ffffffff8fb31d70 RDX: 0000000000000000 RSI: 0000000000000300 RDI: ffffffff8747ce20 RBP: 0000000000000026 R08: 0000000000000001 R09: dffffc0000000000 R10: ffffffff8fb31d80 R11: ffffffff8fb31d70 R12: 0000000000000301 R13: dffffc0000000000 R14: 000000000000071b R15: ffffffff934e19e0 FS: 000055556a28d500(0000) GS:ffff8881f5800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffa26ff56c0 CR3: 0000000124a66000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: count_matching_names kernel/locking/lockdep.c:877 [inline] register_lock_class+0x63b/0x1240 kernel/locking/lockdep.c:1342 __lock_acquire+0x135/0x3c40 kernel/locking/lockdep.c:5103 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851 __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+0x1c37/0x3960 drivers/usb/gadget/udc/dummy_hcd.c:1978 __run_hrtimer kernel/time/hrtimer.c:1801 [inline] __hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1865 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1882 handle_softirqs+0x206/0x8d0 kernel/softirq.c:561 __do_softirq kernel/softirq.c:595 [inline] invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0xfa/0x160 kernel/softirq.c:662 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:vm_normal_page+0x14e/0x2b0 mm/memory.c:656 Code: 89 de 48 89 ef e8 42 8a b9 ff 48 39 dd 0f 84 3a 01 00 00 e8 c4 8f b9 ff 48 b8 00 00 00 00 00 fc ff df 49 c7 04 04 00 00 00 00 <48> 8b 44 24 58 65 48 2b 04 25 28 00 00 00 0f 85 27 01 00 00 48 83 RSP: 0018:ffffc90000577730 EFLAGS: 00000293 RAX: dffffc0000000000 RBX: 000000000012efac RCX: ffffffff81c1a6be RDX: ffff888112370000 RSI: ffffffff81c1a6cc RDI: 0000000000000006 RBP: 000000000000c42e R08: 0000000000000006 R09: 000000000000c42e R10: 000000000012efac R11: 0000000000000007 R12: 1ffff920000aeee6 R13: ffffea0004bbeb00 R14: 00007ffa24bc7000 R15: 0000000000000000 copy_present_ptes mm/memory.c:989 [inline] copy_pte_range mm/memory.c:1174 [inline] copy_pmd_range mm/memory.c:1262 [inline] copy_pud_range mm/memory.c:1299 [inline] copy_p4d_range mm/memory.c:1323 [inline] copy_page_range+0xc99/0x5290 mm/memory.c:1421 dup_mmap kernel/fork.c:748 [inline] dup_mm kernel/fork.c:1700 [inline] copy_mm kernel/fork.c:1752 [inline] copy_process+0x7d5a/0x8bd0 kernel/fork.c:2403 kernel_clone+0xfd/0x960 kernel/fork.c:2815 __do_sys_clone+0xcf/0x120 kernel/fork.c:2958 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ffa262a39d3 Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 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 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00 RSP: 002b:00007fff98194878 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ffa262a39d3 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: 000055556a28d7d0 R11: 0000000000000246 R12: 0000000000000001 R13: 00000000000927c0 R14: 0000000000020cb0 R15: 00007fff98194a10 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:strcmp+0x5b/0xb0 lib/string.c:277 Code: fa 48 c1 e8 03 83 e2 07 42 0f b6 04 28 38 d0 7f 04 84 c0 75 58 0f b6 6b ff 4c 8d 66 01 48 89 f0 48 89 f2 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:ffffc90000007848 EFLAGS: 00010046 RAX: 0000000000000060 RBX: ffffffff8747ce21 RCX: ffffffff8fb31d70 RDX: 0000000000000000 RSI: 0000000000000300 RDI: ffffffff8747ce20 RBP: 0000000000000026 R08: 0000000000000001 R09: dffffc0000000000 R10: ffffffff8fb31d80 R11: ffffffff8fb31d70 R12: 0000000000000301 R13: dffffc0000000000 R14: 000000000000071b R15: ffffffff934e19e0 FS: 000055556a28d500(0000) GS:ffff8881f5800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffa26ff56c0 CR3: 0000000124a66000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- 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: 0f b6 6b ff movzbl -0x1(%rbx),%ebp 19: 4c 8d 66 01 lea 0x1(%rsi),%r12 1d: 48 89 f0 mov %rsi,%rax 20: 48 89 f2 mov %rsi,%rdx 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