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WARNING: CPU: 1 PID: 7102 at net/ipv6/ip6_fib.c:1475 fib6_del+0x7a3/0xa30 net/ipv6/ip6_fib.c:1475
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 7102 Comm: syz-executor0 Not tainted 4.9.52-gc30c69c #54
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801db307998 ffffffff81d93149 ffffffff83a46b40 ffff8801db307a70
 ffffffff83f47f00 ffffffff8346cd23 0000000000000009 ffff8801db307a60
 ffffffff8142e771 0000000041b58ab3 ffffffff84185358 ffffffff8142e5b5
Call Trace:
 <IRQ> [   46.632743]  [<ffffffff81d93149>] __dump_stack lib/dump_stack.c:15 [inline]
 <IRQ> [   46.632743]  [<ffffffff81d93149>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8142e771>] 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
 [<ffffffff8346cd23>] fib6_del+0x7a3/0xa30 net/ipv6/ip6_fib.c:1475
 [<ffffffff8344ce50>] __ip6_del_rt+0x100/0x160 net/ipv6/route.c:2140
 [<ffffffff8346009a>] ip6_del_rt+0xca/0x110 net/ipv6/route.c:2153
 [<ffffffff83461513>] ip6_link_failure+0x243/0x3e0 net/ipv6/route.c:1339
 [<ffffffff83474f8e>] dst_link_failure include/net/dst.h:490 [inline]
 [<ffffffff83474f8e>] ndisc_error_report+0xae/0x190 net/ipv6/ndisc.c:671
 [<ffffffff82f5d275>] neigh_invalidate+0x225/0x530 net/core/neighbour.c:847
 [<ffffffff82f62c67>] neigh_timer_handler+0x597/0xa10 net/core/neighbour.c:933
 [<ffffffff812a5044>] call_timer_fn+0x164/0x700 kernel/time/timer.c:1321
 [<ffffffff812a5f33>] expire_timers kernel/time/timer.c:1361 [inline]
 [<ffffffff812a5f33>] __run_timers kernel/time/timer.c:1660 [inline]
 [<ffffffff812a5f33>] run_timer_softirq+0x693/0x1640 kernel/time/timer.c:1686
 [<ffffffff838af45d>] __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
 [<ffffffff838aecfb>] exiting_irq arch/x86/include/asm/apic.h:659 [inline]
 [<ffffffff838aecfb>] smp_apic_timer_interrupt+0x7b/0xa0 arch/x86/kernel/apic/apic.c:960
 [<ffffffff838add9c>] apic_timer_interrupt+0x8c/0xa0 arch/x86/entry/entry_64.S:709
 <EOI> [   46.847135]  [<ffffffff8124092f>] ? arch_local_irq_restore arch/x86/include/asm/paravirt.h:767 [inline]
 <EOI> [   46.847135]  [<ffffffff8124092f>] ? lock_release+0x66f/0xb80 kernel/locking/lockdep.c:3771
 [<ffffffff838abd1a>] __raw_spin_unlock include/linux/spinlock_api_smp.h:152 [inline]
 [<ffffffff838abd1a>] _raw_spin_unlock+0x1a/0x50 kernel/locking/spinlock.c:183
 [<ffffffff814bd339>] spin_unlock include/linux/spinlock.h:347 [inline]
 [<ffffffff814bd339>] follow_page_pte+0x1d9/0xca0 mm/gup.c:205
 [<ffffffff814be300>] follow_page_mask+0x500/0xdb0 mm/gup.c:283
 [<ffffffff814beeb9>] __get_user_pages+0x309/0x1110 mm/gup.c:582
 [<ffffffff814c0b9a>] populate_vma_page_range+0x19a/0x230 mm/gup.c:1039
 [<ffffffff814c0e3c>] __mm_populate+0x20c/0x360 mm/gup.c:1089
 [<ffffffff814978e8>] mm_populate include/linux/mm.h:2023 [inline]
 [<ffffffff814978e8>] vm_mmap_pgoff+0x198/0x1b0 mm/util.c:309
 [<ffffffff814e11c0>] SYSC_mmap_pgoff mm/mmap.c:1523 [inline]
 [<ffffffff814e11c0>] SyS_mmap_pgoff+0xd0/0x560 mm/mmap.c:1481
 [<ffffffff8105fb76>] SYSC_mmap arch/x86/kernel/sys_x86_64.c:95 [inline]
 [<ffffffff8105fb76>] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:86
 [<ffffffff838ac5c5>] entry_SYSCALL_64_fastpath+0x23/0xc6
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..