syzkaller552444 uses obsolete (PF_INET,SOCK_PACKET)
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WARNING: CPU: 0 PID: 4063 at net/ipv6/ip6_fib.c:1320 fib6_repair_tree+0x57a/0x7c0 net/ipv6/ip6_fib.c:1320
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 4063 Comm: syzkaller552444 Not tainted 4.9.79-g71f1469 #25
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801c61e71e0 ffffffff81d94829 ffffffff83a47c40 ffff8801c61e72b8
 ffffffff83f4b700 ffffffff8346d8ba 0000000000000009 ffff8801c61e72a8
 ffffffff8142f531 0000000041b58ab3 ffffffff8418ab10 ffffffff8142f375
Call Trace:
 [<ffffffff81d94829>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d94829>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8142f531>] panic+0x1bc/0x3a8 kernel/panic.c:179
 [<ffffffff81131164>] __warn+0x1c4/0x1e0 kernel/panic.c:542
 [<ffffffff811313cc>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff8346d8ba>] fib6_repair_tree+0x57a/0x7c0 net/ipv6/ip6_fib.c:1320
 [<ffffffff8347474a>] fib6_del_route net/ipv6/ip6_fib.c:1459 [inline]
 [<ffffffff8347474a>] fib6_del+0x88a/0xa30 net/ipv6/ip6_fib.c:1505
 [<ffffffff83474c26>] fib6_clean_node+0x336/0x4a0 net/ipv6/ip6_fib.c:1657
 [<ffffffff8346bafb>] fib6_walk_continue+0x39b/0x620 net/ipv6/ip6_fib.c:1583
 [<ffffffff8346e499>] fib6_walk+0xd9/0x150 net/ipv6/ip6_fib.c:1628
 [<ffffffff8346e5f5>] fib6_clean_tree+0xe5/0x130 net/ipv6/ip6_fib.c:1702
 [<ffffffff8346f569>] __fib6_clean_all+0xf9/0x230 net/ipv6/ip6_fib.c:1718
 [<ffffffff83474db7>] fib6_clean_all+0x27/0x30 net/ipv6/ip6_fib.c:1729
 [<ffffffff8346a551>] rt6_ifdown+0xa1/0x7f0 net/ipv6/route.c:2715
 [<ffffffff83444e50>] addrconf_ifdown+0xd0/0x10f0 net/ipv6/addrconf.c:3566
 [<ffffffff8344cd58>] addrconf_notify+0x948/0x2230 net/ipv6/addrconf.c:3490
 [<ffffffff8119efe0>] notifier_call_chain+0x90/0x1a0 kernel/notifier.c:93
 [<ffffffff8119f16d>] __raw_notifier_call_chain kernel/notifier.c:394 [inline]
 [<ffffffff8119f16d>] raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401
 [<ffffffff82f29dd1>] call_netdevice_notifiers_info+0x51/0x90 net/core/dev.c:1647
 [<ffffffff82f2a166>] call_netdevice_notifiers net/core/dev.c:1663 [inline]
 [<ffffffff82f2a166>] dev_set_mtu+0x216/0x3b0 net/core/dev.c:6577
 [<ffffffff82f9a5ae>] dev_ifsioc+0x46e/0x820 net/core/dev_ioctl.c:262
 [<ffffffff82f9acd5>] dev_ioctl+0x1d5/0xd40 net/core/dev_ioctl.c:533
 [<ffffffff82ed1f24>] sock_do_ioctl+0x94/0xb0 net/socket.c:899
 [<ffffffff82ed2940>] sock_ioctl+0x2e0/0x3d0 net/socket.c:978
 [<ffffffff815ae42a>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff815ae42a>] do_vfs_ioctl+0x1aa/0x1140 fs/ioctl.c:679
 [<ffffffff815af44f>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<ffffffff815af44f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<ffffffff838b346e>] entry_SYSCALL_64_fastpath+0x29/0xe8
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..