------------[ cut here ]------------
WARNING: CPU: 0 PID: 11667 at net/ipv6/ip6_fib.c:1477 fib6_del+0x947/0xca0 net/ipv6/ip6_fib.c:1477
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 11667 Comm: syz-executor3 Not tainted 4.13.0-rc7+ #58
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 panic+0x1e4/0x417 kernel/panic.c:180
 __warn+0x1c4/0x1d9 kernel/panic.c:541
 report_bug+0x211/0x2d0 lib/bug.c:183
 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:190
 do_trap_no_signal arch/x86/kernel/traps.c:224 [inline]
 do_trap+0x260/0x390 arch/x86/kernel/traps.c:273
 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:310
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:323
 invalid_op+0x1e/0x30 arch/x86/entry/entry_64.S:846
RIP: 0010:fib6_del+0x947/0xca0 net/ipv6/ip6_fib.c:1477
RSP: 0018:ffff8801db2074d8 EFLAGS: 00010206
RAX: ffff8801c6522040 RBX: ffff8801cd1af700 RCX: 0000000000000000
RDX: 0000000000000100 RSI: ffff8801db207650 RDI: ffff8801cd1af764
RBP: ffff8801db2075f0 R08: ffffffff86df19b8 R09: 0000000000000002
R10: ffff8801db2074b8 R11: 1ffff10038ca4663 R12: dffffc0000000000
R13: ffff8801db207650 R14: ffff8801cc058280 R15: 1ffff1003b640ea5
 __ip6_del_rt+0xc7/0x120 net/ipv6/route.c:2136
 ip6_del_rt+0x132/0x1a0 net/ipv6/route.c:2149
 ip6_link_failure+0x244/0x380 net/ipv6/route.c:1359
 dst_link_failure include/net/dst.h:454 [inline]
 ndisc_error_report+0xae/0x180 net/ipv6/ndisc.c:682
 neigh_invalidate+0x225/0x530 net/core/neighbour.c:883
 neigh_timer_handler+0x883/0xca0 net/core/neighbour.c:969
 call_timer_fn+0x233/0x830 kernel/time/timer.c:1281
 expire_timers kernel/time/timer.c:1320 [inline]
 __run_timers+0x7fd/0xb90 kernel/time/timer.c:1620
 run_timer_softirq+0x4c/0xb0 kernel/time/timer.c:1646
 __do_softirq+0x2f5/0xba3 kernel/softirq.c:284
 invoke_softirq kernel/softirq.c:364 [inline]
 irq_exit+0x1cc/0x200 kernel/softirq.c:405
 exiting_irq arch/x86/include/asm/apic.h:638 [inline]
 smp_apic_timer_interrupt+0x76/0xa0 arch/x86/kernel/apic/apic.c:1044
 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:702
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:814 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x5e/0xba kernel/locking/spinlock.c:191
RSP: 0018:ffff8801c4986fc0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: dffffc0000000000 RBX: 0000000000000286 RCX: 0000000000000006
RDX: 1ffffffff0b59371 RSI: 1ffff10038ca4521 RDI: 0000000000000286
RBP: ffff8801c4986fd0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88021fffd6b8
R13: ffff88021fffa000 R14: ffff88021fffd6b8 R15: ffffea00063a8000
 </IRQ>
 spin_unlock_irqrestore include/linux/spinlock.h:354 [inline]
 deferred_split_huge_page+0x207/0x590 mm/huge_memory.c:2596
 page_remove_rmap+0x767/0xcb0 mm/rmap.c:1299
 zap_pte_range mm/memory.c:1266 [inline]
 zap_pmd_range mm/memory.c:1347 [inline]
 zap_pud_range mm/memory.c:1376 [inline]
 zap_p4d_range mm/memory.c:1397 [inline]
 unmap_page_range+0x127f/0x2160 mm/memory.c:1418
 unmap_single_vma+0x15f/0x2d0 mm/memory.c:1463
 unmap_vmas+0xf1/0x1b0 mm/memory.c:1493
 unmap_region+0x2b2/0x4f0 mm/mmap.c:2495
 do_munmap+0x83e/0xf40 mm/mmap.c:2700
 mmap_region+0x59e/0x15a0 mm/mmap.c:1630
 do_mmap+0x69b/0xd40 mm/mmap.c:1467
 do_mmap_pgoff include/linux/mm.h:2107 [inline]
 vm_mmap_pgoff+0x1de/0x280 mm/util.c:333
 SYSC_mmap_pgoff mm/mmap.c:1517 [inline]
 SyS_mmap_pgoff+0x23b/0x5f0 mm/mmap.c:1475
 SYSC_mmap arch/x86/kernel/sys_x86_64.c:98 [inline]
 SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:89
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x4512e9
RSP: 002b:00007f6463ed8c08 EFLAGS: 00000216 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00000000007181f8 RCX: 00000000004512e9
RDX: 0000000000000001 RSI: 0000000000fff000 RDI: 0000000020000000
RBP: 0000000000000086 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000000032 R11: 0000000000000216 R12: 00000000004b6359
R13: 00000000ffffffff R14: 0000000000000019 R15: 0000000020000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..