------------[ cut here ]------------
WARNING: CPU: 0 PID: 6592 at net/ipv6/ip6_fib.c:1452 fib6_del+0x713/0x1130 net/ipv6/ip6_fib.c:1452
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 6592 Comm: syz-executor1 Not tainted 4.9.44-gbf7ef8f #34
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801db207998 ffffffff81d929c9 ffffffff83a46b40 ffff8801db207a70
 ffffffff83f47700 ffffffff83467663 0000000000000009 ffff8801db207a60
 ffffffff8142e101 0000000041b58ab3 ffffffff84184170 ffffffff8142df45
Call Trace:
 <IRQ> [   49.162818]  [<ffffffff81d929c9>] __dump_stack lib/dump_stack.c:15 [inline]
 <IRQ> [   49.162818]  [<ffffffff81d929c9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8142e101>] panic+0x1bc/0x3a8 kernel/panic.c:179
 [<ffffffff81131e54>] __warn+0x1c4/0x1e0 kernel/panic.c:542
 [<ffffffff811320bc>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff83467663>] fib6_del+0x713/0x1130 net/ipv6/ip6_fib.c:1452
 [<ffffffff83448660>] __ip6_del_rt+0x100/0x160 net/ipv6/route.c:2131
 [<ffffffff8345b7aa>] ip6_del_rt+0xca/0x110 net/ipv6/route.c:2144
 [<ffffffff8345cb5f>] ip6_link_failure+0x17f/0x240 net/ipv6/route.c:1337
 [<ffffffff8347005e>] dst_link_failure include/net/dst.h:490 [inline]
 [<ffffffff8347005e>] ndisc_error_report+0xae/0x190 net/ipv6/ndisc.c:671
 [<ffffffff82f592f5>] neigh_invalidate+0x225/0x530 net/core/neighbour.c:847
 [<ffffffff82f5ece7>] neigh_timer_handler+0x597/0xa10 net/core/neighbour.c:933
 [<ffffffff812a5304>] call_timer_fn+0x164/0x700 kernel/time/timer.c:1308
 [<ffffffff812a640d>] expire_timers kernel/time/timer.c:1348 [inline]
 [<ffffffff812a640d>] __run_timers kernel/time/timer.c:1641 [inline]
 [<ffffffff812a640d>] run_timer_softirq+0x65d/0x1600 kernel/time/timer.c:1654
 [<ffffffff838a971d>] __do_softirq+0x22d/0x964 kernel/softirq.c:284
 [<ffffffff81147905>] invoke_softirq kernel/softirq.c:364 [inline]
 [<ffffffff81147905>] irq_exit+0x165/0x190 kernel/softirq.c:405
 [<ffffffff838a8fbb>] exiting_irq arch/x86/include/asm/apic.h:659 [inline]
 [<ffffffff838a8fbb>] smp_apic_timer_interrupt+0x7b/0xa0 arch/x86/kernel/apic/apic.c:960
 [<ffffffff838a805c>] apic_timer_interrupt+0x8c/0xa0 arch/x86/entry/entry_64.S:709
 <EOI> [   49.381961]  [<ffffffff81dbfc07>] ? clear_page_c_e+0x7/0x10 arch/x86/lib/clear_page_64.S:53
 [<ffffffff81547a22>] __do_huge_pmd_anonymous_page mm/huge_memory.c:558 [inline]
 [<ffffffff81547a22>] do_huge_pmd_anonymous_page+0x6c2/0x10d0 mm/huge_memory.c:700
 [<ffffffff814ced24>] create_huge_pmd mm/memory.c:3403 [inline]
 [<ffffffff814ced24>] __handle_mm_fault mm/memory.c:3553 [inline]
 [<ffffffff814ced24>] handle_mm_fault+0x1564/0x2510 mm/memory.c:3614
 [<ffffffff810e020b>] __do_page_fault+0x4eb/0xbd0 arch/x86/mm/fault.c:1397
 [<ffffffff810e0917>] do_page_fault+0x27/0x30 arch/x86/mm/fault.c:1460
 [<ffffffff838a7a58>] page_fault+0x28/0x30 arch/x86/entry/entry_64.S:1012
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..