=====================================================
BUG: KMSAN: uninit-value in fib6_ifdown+0x126/0x840 net/ipv6/route.c:4844
 fib6_ifdown+0x126/0x840 net/ipv6/route.c:4844
 fib6_clean_node+0x31f/0x6f0 net/ipv6/ip6_fib.c:2188
 fib6_walk_continue+0x93a/0xb00 net/ipv6/ip6_fib.c:2113
 fib6_walk+0x1a6/0x3d0 net/ipv6/ip6_fib.c:2161
 fib6_clean_tree net/ipv6/ip6_fib.c:2241 [inline]
 __fib6_clean_all net/ipv6/ip6_fib.c:2257 [inline]
 fib6_clean_all+0x201/0x340 net/ipv6/ip6_fib.c:2268
 rt6_sync_down_dev+0x131/0x170 net/ipv6/route.c:4894
 addrconf_notify+0xc4c/0x1e40 net/ipv6/addrconf.c:3591
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0xbc/0x240 kernel/notifier.c:455
 call_netdevice_notifiers_info net/core/dev.c:1945 [inline]
 netdev_state_change+0x283/0x370 net/core/dev.c:1334
 linkwatch_do_dev+0x5df/0x610 net/core/link_watch.c:168
 __linkwatch_run_queue+0x598/0xef0 net/core/link_watch.c:221
 linkwatch_event+0x67/0x80 net/core/link_watch.c:264
 process_one_work+0xb27/0x13e0 kernel/workqueue.c:2289
 worker_thread+0x1076/0x1d60 kernel/workqueue.c:2436
 kthread+0x31b/0x430 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

Uninit was created at:
 __alloc_pages+0x9f1/0xe80 mm/page_alloc.c:5578
 alloc_pages+0xaae/0xd80 mm/mempolicy.c:2285
 alloc_slab_page mm/slub.c:1794 [inline]
 allocate_slab+0x1b5/0x1010 mm/slub.c:1939
 new_slab mm/slub.c:1992 [inline]
 ___slab_alloc+0x10c3/0x2d60 mm/slub.c:3180
 __slab_alloc mm/slub.c:3279 [inline]
 slab_alloc_node mm/slub.c:3364 [inline]
 __kmem_cache_alloc_node+0x7fe/0xc90 mm/slub.c:3437
 kmalloc_trace+0x4d/0x1f0 mm/slab_common.c:1046
 kmalloc include/linux/slab.h:576 [inline]
 kzalloc include/linux/slab.h:712 [inline]
 ref_tracker_alloc+0x153/0x6f0 lib/ref_tracker.c:85
 __netdev_tracker_alloc include/linux/netdevice.h:3996 [inline]
 netdev_hold include/linux/netdevice.h:4025 [inline]
 ___neigh_create+0x142f/0x2ff0 net/core/neighbour.c:651
 __neigh_create+0x47/0x60 net/core/neighbour.c:731
 ip6_finish_output2+0x1334/0x2a90 net/ipv6/ip6_output.c:125
 __ip6_finish_output net/ipv6/ip6_output.c:195 [inline]
 ip6_finish_output+0xa39/0x1230 net/ipv6/ip6_output.c:206
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip6_output+0x396/0x640 net/ipv6/ip6_output.c:227
 dst_output include/net/dst.h:445 [inline]
 NF_HOOK include/linux/netfilter.h:302 [inline]
 ndisc_send_skb+0xcaf/0x1560 net/ipv6/ndisc.c:508
 ndisc_send_rs+0x968/0xac0 net/ipv6/ndisc.c:718
 addrconf_rs_timer+0x52b/0x6e0 net/ipv6/addrconf.c:3931
 call_timer_fn+0x43/0x480 kernel/time/timer.c:1474
 expire_timers+0x272/0x610 kernel/time/timer.c:1519
 __run_timers+0x5bd/0x8c0 kernel/time/timer.c:1790
 run_timer_softirq+0x64/0xe0 kernel/time/timer.c:1803
 __do_softirq+0x1c5/0x7b9 kernel/softirq.c:571

CPU: 0 PID: 3576 Comm: kworker/0:6 Not tainted 6.1.0-rc4-syzkaller-62818-gb1376a14297d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Workqueue: events linkwatch_event
=====================================================