------------[ cut here ]------------
WARNING: CPU: 0 PID: 18467 at net/ipv6/ip6_fib.c:1456 fib6_del+0x71b/0x9b0 net/ipv6/ip6_fib.c:1456
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 18467 Comm: loop5 Not tainted 4.9.50-gf7d2974 #47
selinux_nlmsg_perm: 253 callbacks suppressed
SELinux: unrecognized netlink message: protocol=6 nlmsg_type=45853 sclass=netlink_xfrm_socket pig=18475 comm=syz-executor6
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801db2079a0 ffffffff81d92fc9 ffffffff83a46b40 ffff8801db207a78
 ffffffff83f47900 ffffffff8346bf3b 0000000000000009 ffff8801db207a68
 ffffffff8142e6d1 0000000041b58ab3 ffffffff84184980 ffffffff8142e515
Call Trace:
 <IRQ> [   96.630414]  [<ffffffff81d92fc9>] __dump_stack lib/dump_stack.c:15 [inline]
 <IRQ> [   96.630414]  [<ffffffff81d92fc9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8142e6d1>] panic+0x1bc/0x3a8 kernel/panic.c:179
 [<ffffffff81131ed4>] __warn+0x1c4/0x1e0 kernel/panic.c:542
 [<ffffffff8113213c>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff8346bf3b>] fib6_del+0x71b/0x9b0 net/ipv6/ip6_fib.c:1456
 [<ffffffff8344c620>] __ip6_del_rt+0x100/0x160 net/ipv6/route.c:2131
 [<ffffffff8345f76a>] ip6_del_rt+0xca/0x110 net/ipv6/route.c:2144
 [<ffffffff83460b1f>] ip6_link_failure+0x17f/0x240 net/ipv6/route.c:1337
 [<ffffffff834741ae>] dst_link_failure include/net/dst.h:490 [inline]
 [<ffffffff834741ae>] ndisc_error_report+0xae/0x190 net/ipv6/ndisc.c:671
 [<ffffffff82f5d285>] neigh_invalidate+0x225/0x530 net/core/neighbour.c:847
 [<ffffffff82f62c77>] neigh_timer_handler+0x597/0xa10 net/core/neighbour.c:933
 [<ffffffff812a4f64>] call_timer_fn+0x164/0x700 kernel/time/timer.c:1321
 [<ffffffff812a5e53>] expire_timers kernel/time/timer.c:1361 [inline]
 [<ffffffff812a5e53>] __run_timers kernel/time/timer.c:1660 [inline]
 [<ffffffff812a5e53>] run_timer_softirq+0x693/0x1640 kernel/time/timer.c:1686
 [<ffffffff838adc1d>] __do_softirq+0x22d/0x964 kernel/softirq.c:284
 [<ffffffff81147985>] invoke_softirq kernel/softirq.c:364 [inline]
 [<ffffffff81147985>] irq_exit+0x165/0x190 kernel/softirq.c:405
 [<ffffffff838ad4bb>] exiting_irq arch/x86/include/asm/apic.h:659 [inline]
 [<ffffffff838ad4bb>] smp_apic_timer_interrupt+0x7b/0xa0 arch/x86/kernel/apic/apic.c:960
 [<ffffffff838ac55c>] apic_timer_interrupt+0x8c/0xa0 arch/x86/entry/entry_64.S:709
 <EOI> [   96.850794]  [<ffffffff824b0353>] ? lo_write_bvec+0x203/0x3d0 drivers/block/loop.c:281
 [<ffffffff824b554c>] lo_write_simple drivers/block/loop.c:291 [inline]
 [<ffffffff824b554c>] do_req_filebacked drivers/block/loop.c:538 [inline]
 [<ffffffff824b554c>] loop_handle_cmd drivers/block/loop.c:1685 [inline]
 [<ffffffff824b554c>] loop_queue_work+0x150c/0x22b0 drivers/block/loop.c:1697
 [<ffffffff8119b1b8>] kthread_worker_fn+0x348/0x6a0 kernel/kthread.c:627
 [<ffffffff8119acdd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff838ab02a>] ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:433
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..