IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready
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WARNING: CPU: 0 PID: 5489 at net/ipv6/ip6_fib.c:1477 fib6_del+0x946/0xb10 net/ipv6/ip6_fib.c:1477
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 5489 Comm: syz-executor.4 Not tainted 4.9.141+ #1
 ffff8801c8e7e7e8 ffffffff81b42e79 ffffffff82a38ce0 00000000ffffffff
 ffffffff82cc1e00 0000000000000000 0000000000000009 ffff8801c8e7e8a8
 ffffffff813f7125 0000000041b58ab3 ffffffff82e2b62b ffffffff813f6f66
Call Trace:
 [<ffffffff81b42e79>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b42e79>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff813f7125>] panic+0x1bf/0x39f kernel/panic.c:179
 [<ffffffff813f7362>] __warn.cold.8+0x2f/0x2f kernel/panic.c:542
 [<ffffffff810dc02c>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff826eeeb6>] fib6_del+0x946/0xb10 net/ipv6/ip6_fib.c:1477
 [<ffffffff826ef2a0>] fib6_clean_node+0x220/0x4c0 net/ipv6/ip6_fib.c:1657
 [<ffffffff826e6545>] fib6_walk_continue+0x3e5/0x640 net/ipv6/ip6_fib.c:1583
 [<ffffffff826e6b01>] fib6_walk+0x91/0xf0 net/ipv6/ip6_fib.c:1628
 [<ffffffff826e6c33>] fib6_clean_tree+0xd3/0x110 net/ipv6/ip6_fib.c:1702
 [<ffffffff826e6d69>] __fib6_clean_all+0xf9/0x220 net/ipv6/ip6_fib.c:1718
 [<ffffffff826ef567>] fib6_clean_all+0x27/0x30 net/ipv6/ip6_fib.c:1729
 [<ffffffff826e4b51>] rt6_ifdown+0xa1/0x7f0 net/ipv6/route.c:2719
 [<ffffffff826bf2e0>] addrconf_ifdown+0xd0/0x1420 net/ipv6/addrconf.c:3569
 [<ffffffff826c74be>] addrconf_notify+0x8ee/0x2140 net/ipv6/addrconf.c:3493
 [<ffffffff811478d4>] notifier_call_chain+0xb4/0x1d0 kernel/notifier.c:93
 [<ffffffff81147a5d>] __raw_notifier_call_chain kernel/notifier.c:394 [inline]
 [<ffffffff81147a5d>] raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401
 [<ffffffff822f4a45>] call_netdevice_notifiers_info+0x55/0x70 net/core/dev.c:1647
 [<ffffffff82306fbd>] netdev_state_change+0xdd/0x100 net/core/dev.c:1286
 [<ffffffff8234e80d>] do_setlink+0x26cd/0x2ef0 net/core/rtnetlink.c:2199
 [<ffffffff82354b10>] rtnl_group_changelink net/core/rtnetlink.c:2423 [inline]
 [<ffffffff82354b10>] rtnl_newlink+0xbd0/0x1550 net/core/rtnetlink.c:2571
 [<ffffffff8235592c>] rtnetlink_rcv_msg+0x49c/0x650 net/core/rtnetlink.c:4078
 [<ffffffff823d59e5>] netlink_rcv_skb+0x145/0x370 net/netlink/af_netlink.c:2365
 [<ffffffff8234abfa>] rtnetlink_rcv+0x2a/0x40 net/core/rtnetlink.c:4084
 [<ffffffff823d4478>] netlink_unicast_kernel net/netlink/af_netlink.c:1285 [inline]
 [<ffffffff823d4478>] netlink_unicast+0x4d8/0x6d0 net/netlink/af_netlink.c:1311
 [<ffffffff823d4e44>] netlink_sendmsg+0x694/0xc30 net/netlink/af_netlink.c:1859
 [<ffffffff822a063b>] sock_sendmsg_nosec net/socket.c:648 [inline]
 [<ffffffff822a063b>] sock_sendmsg+0xbb/0x110 net/socket.c:658
 [<ffffffff822a231c>] ___sys_sendmsg+0x6fc/0x840 net/socket.c:1982
 [<ffffffff822a5339>] __sys_sendmsg+0xd9/0x190 net/socket.c:2016
 [<ffffffff822a541d>] SYSC_sendmsg net/socket.c:2027 [inline]
 [<ffffffff822a541d>] SyS_sendmsg+0x2d/0x50 net/socket.c:2023
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff82817893>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Kernel Offset: disabled
Rebooting in 86400 seconds..