------------[ cut here ]------------
WARNING: CPU: 1 PID: 23458 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: 1 PID: 23458 Comm: syz-executor3 Not tainted 4.9.47-g6ec1052 #40
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801db3079a0 ffffffff81d93049 ffffffff83a46b40 ffff8801db307a78
 ffffffff83f47900 ffffffff8346bf3b 0000000000000009 ffff8801db307a68
 ffffffff8142e6d1 0000000041b58ab3 ffffffff84184938 ffffffff8142e515
Call Trace:
 <IRQ> [  115.418151]  [<ffffffff81d93049>] __dump_stack lib/dump_stack.c:15 [inline]
 <IRQ> [  115.418151]  [<ffffffff81d93049>] 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> [  115.638360]  [<ffffffff8136a639>] ? __sanitizer_cov_trace_pc+0x29/0x60 kernel/kcov.c:68
 [<ffffffff814cf7fd>] do_fault_around mm/memory.c:3109 [inline]
 [<ffffffff814cf7fd>] do_read_fault mm/memory.c:3149 [inline]
 [<ffffffff814cf7fd>] do_fault mm/memory.c:3289 [inline]
 [<ffffffff814cf7fd>] handle_pte_fault mm/memory.c:3490 [inline]
 [<ffffffff814cf7fd>] __handle_mm_fault mm/memory.c:3577 [inline]
 [<ffffffff814cf7fd>] handle_mm_fault+0x1a6d/0x2530 mm/memory.c:3614
 [<ffffffff814bef54>] faultin_page mm/gup.c:386 [inline]
 [<ffffffff814bef54>] __get_user_pages+0x3b4/0x1110 mm/gup.c:585
 [<ffffffff814c0b8a>] populate_vma_page_range+0x19a/0x230 mm/gup.c:1039
 [<ffffffff814c0e2c>] __mm_populate+0x20c/0x360 mm/gup.c:1089
 [<ffffffff814978d8>] mm_populate include/linux/mm.h:2023 [inline]
 [<ffffffff814978d8>] vm_mmap_pgoff+0x198/0x1b0 mm/util.c:309
 [<ffffffff814e11b0>] SYSC_mmap_pgoff mm/mmap.c:1523 [inline]
 [<ffffffff814e11b0>] SyS_mmap_pgoff+0xd0/0x560 mm/mmap.c:1481
 [<ffffffff8105fa86>] SYSC_mmap arch/x86/kernel/sys_x86_64.c:95 [inline]
 [<ffffffff8105fa86>] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:86
 [<ffffffff838aad85>] entry_SYSCALL_64_fastpath+0x23/0xc6
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..