BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 0 P4D 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 13 Comm: kworker/0:1 Not tainted 5.4.276-syzkaller-00020-g4275fce9fe94 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Workqueue: events linkwatch_event
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09d78 EFLAGS: 00010202
RAX: ffffffff8154d48a RBX: 0000000000000101 RCX: ffff8881f5dcaf40
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881e3e9b1c0
RBP: ffff8881f6e09f28 R08: ffffffff8154d0ce R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffae68
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e3e9b1c0
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001f0e8a000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 call_timer_fn+0x36/0x390 kernel/time/timer.c:1448
 expire_timers kernel/time/timer.c:1493 [inline]
 __run_timers+0x879/0xbe0 kernel/time/timer.c:1817
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830
 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292
 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1086
 </IRQ>
 do_softirq+0x121/0x160 kernel/softirq.c:337
 __local_bh_enable_ip+0x6a/0x70 kernel/softirq.c:189
 spin_unlock_bh include/linux/spinlock.h:383 [inline]
 __fib6_clean_all net/ipv6/ip6_fib.c:2152 [inline]
 fib6_clean_all+0x214/0x2d0 net/ipv6/ip6_fib.c:2161
 rt6_sync_up+0x17a/0x1f0 net/ipv6/route.c:4656
 addrconf_notify+0xa26/0xe50 net/ipv6/addrconf.c:3668
 notifier_call_chain kernel/notifier.c:98 [inline]
 __raw_notifier_call_chain kernel/notifier.c:399 [inline]
 raw_notifier_call_chain+0x95/0x110 kernel/notifier.c:406
 call_netdevice_notifiers_info net/core/dev.c:1670 [inline]
 netdev_state_change+0x146/0x1e0 net/core/dev.c:1273
 linkwatch_do_dev+0xfc/0x130 net/core/link_watch.c:159
 __linkwatch_run_queue+0x4cc/0x7f0 net/core/link_watch.c:205
 linkwatch_event+0x48/0x50 net/core/link_watch.c:244
 process_one_work+0x765/0xd20 kernel/workqueue.c:2290
 worker_thread+0xaef/0x1470 kernel/workqueue.c:2436
 kthread+0x2da/0x360 kernel/kthread.c:288
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354
Modules linked in:
CR2: 0000000000000000
---[ end trace 7002ff7a48f34660 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09d78 EFLAGS: 00010202
RAX: ffffffff8154d48a RBX: 0000000000000101 RCX: ffff8881f5dcaf40
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881e3e9b1c0
RBP: ffff8881f6e09f28 R08: ffffffff8154d0ce R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffae68
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e3e9b1c0
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001f0e8a000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600