BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 1ea74b067 P4D 1ea74b067 PUD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 0 PID: 1889 Comm: syz.2.526 Not tainted 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff8881f6e09cf0 EFLAGS: 00010202 RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881e5405e80 RDX: 0000000080000101 RSI: 0000000000000000 RDI: ffff8881ecb8b1c0 RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000ffffa828 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881ecb8b1c0 FS: 00007fafcae366c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001cb644000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: call_timer_fn+0x3c/0x380 kernel/time/timer.c:1448 expire_timers kernel/time/timer.c:1493 [inline] __run_timers+0x81d/0xb60 kernel/time/timer.c:1817 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1830 __do_softirq+0x236/0x660 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x197/0x1c0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:539 [inline] smp_apic_timer_interrupt+0x11d/0x490 arch/x86/kernel/apic/apic.c:1161 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834 RIP: 0010:__raw_callee_save___kvm_vcpu_is_preempted+0xf/0x20 Code: 18 00 00 00 48 c7 c7 80 19 cb 85 e8 5b 54 60 00 5d c3 00 00 90 90 00 00 90 90 00 48 8b 04 fd 10 7f 43 85 80 b8 d0 8f 02 00 00 <0f> 95 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 55 48 89 e5 41 RSP: 0018:ffff8881e9b2ebf8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff8881f6f00000 RBX: ffff8881ece7af40 RCX: ffffffff8147eff9 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001 RBP: ffff8881e9b2ec90 R08: dffffc0000000000 R09: ffffed103ca80bd1 R10: ffffed103ca80bd1 R11: 1ffff1103ca80bd0 R12: ffffffff85d61150 R13: ffffffff85d61140 R14: 0000000000000001 R15: dffffc0000000000 mutex_optimistic_spin kernel/locking/mutex.c:685 [inline] __mutex_lock_common kernel/locking/mutex.c:1063 [inline] __mutex_lock+0x661/0xe30 kernel/locking/mutex.c:1114 __mutex_lock_killable_slowpath+0xe/0x10 kernel/locking/mutex.c:1381 mutex_lock_killable+0xd3/0xe0 kernel/locking/mutex.c:1348 pcpu_alloc+0x168/0x1120 mm/percpu.c:1629 __alloc_percpu_gfp+0x25/0x30 mm/percpu.c:1783 fib_nh_common_init+0x42/0x140 net/ipv4/fib_semantics.c:579 fib6_nh_init+0x12ae/0x1e20 net/ipv6/route.c:3534 ip6_route_info_create+0xa55/0x1510 net/ipv6/route.c:3726 ip6_route_add+0x27/0x130 net/ipv6/route.c:3770 addrconf_prefix_route net/ipv6/addrconf.c:2443 [inline] sit_add_v4_addrs net/ipv6/addrconf.c:3202 [inline] addrconf_sit_config+0x8a6/0xd60 net/ipv6/addrconf.c:3452 addrconf_notify+0x9d1/0xeb0 net/ipv6/addrconf.c:3647 notifier_call_chain kernel/notifier.c:98 [inline] __raw_notifier_call_chain kernel/notifier.c:399 [inline] raw_notifier_call_chain+0xa0/0x120 kernel/notifier.c:406 call_netdevice_notifiers_info net/core/dev.c:1670 [inline] call_netdevice_notifiers_extack net/core/dev.c:1682 [inline] call_netdevice_notifiers net/core/dev.c:1696 [inline] __dev_notify_flags+0x1e2/0x3d0 net/core/dev.c:-1 dev_change_flags+0xe8/0x1a0 net/core/dev.c:8034 dev_ifsioc+0x110/0xa40 net/core/dev_ioctl.c:226 dev_ioctl+0x550/0xb80 net/core/dev_ioctl.c:483 sock_do_ioctl+0x235/0x330 net/socket.c:1081 sock_ioctl+0x505/0x710 net/socket.c:1198 do_vfs_ioctl+0x753/0x13f0 fs/ioctl.c:47 ksys_ioctl fs/ioctl.c:742 [inline] __do_sys_ioctl fs/ioctl.c:749 [inline] __se_sys_ioctl fs/ioctl.c:747 [inline] __x64_sys_ioctl+0xe1/0x120 fs/ioctl.c:747 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7fafcc7cd969 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fafcae36038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fafcc9f4fa0 RCX: 00007fafcc7cd969 RDX: 0000200000000040 RSI: 0000000000008914 RDI: 000000000000000a RBP: 00007fafcc84fab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fafcc9f4fa0 R15: 00007fff112feba8 Modules linked in: CR2: 0000000000000000 ---[ end trace 28cee9f36f8c9fa3 ]--- RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff8881f6e09cf0 EFLAGS: 00010202 RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881e5405e80 RDX: 0000000080000101 RSI: 0000000000000000 RDI: ffff8881ecb8b1c0 RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000ffffa828 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881ecb8b1c0 FS: 00007fafcae366c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001cb644000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: 18 00 sbb %al,(%rax) 2: 00 00 add %al,(%rax) 4: 48 c7 c7 80 19 cb 85 mov $0xffffffff85cb1980,%rdi b: e8 5b 54 60 00 call 0x60546b 10: 5d pop %rbp 11: c3 ret 12: 00 00 add %al,(%rax) 14: 90 nop 15: 90 nop 16: 00 00 add %al,(%rax) 18: 90 nop 19: 90 nop 1a: 00 48 8b add %cl,-0x75(%rax) 1d: 04 fd add $0xfd,%al 1f: 10 7f 43 adc %bh,0x43(%rdi) 22: 85 80 b8 d0 8f 02 test %eax,0x28fd0b8(%rax) 28: 00 00 add %al,(%rax) * 2a: 0f 95 c0 setne %al <-- trapping instruction 2d: c3 ret 2e: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1) 35: 00 00 00 00 39: 66 90 xchg %ax,%ax 3b: 55 push %rbp 3c: 48 89 e5 mov %rsp,%rbp 3f: 41 rex.B