------------[ cut here ]------------
WARNING: CPU: 1 PID: 4252 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: 1 PID: 4252 Comm: syz-executor4 Not tainted 4.13.0-rc7+ #56
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:ffff8801db3074d8 EFLAGS: 00010206
RAX: ffff8801d624e6c0 RBX: ffff8801c7678e00 RCX: 0000000000000000
RDX: 0000000000000100 RSI: ffff8801db307650 RDI: ffff8801c7678e64
RBP: ffff8801db3075f0 R08: ffffffff86df14a8 R09: 0000000000000002
R10: ffff8801db3074b8 R11: 1ffff1003ac49f33 R12: dffffc0000000000
R13: ffff8801db307650 R14: ffff88019d5701c0 R15: 1ffff1003b660ea5
 __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:lock_is_held_type+0x18b/0x210 kernel/locking/lockdep.c:3895
RSP: 0018:ffff8801d894f2f8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: dffffc0000000000 RBX: 0000000000000286 RCX: 1ffff1003ac49edb
RDX: 1ffffffff0b59371 RSI: 00000000ffffffff RDI: 0000000000000286
RBP: ffff8801d894f318 R08: 0000000000000001 R09: 1ffff1003b129ea5
R10: ffff8801d894f5b0 R11: 0000000000000000 R12: ffff8801d624e6c0
R13: 0000000000000000 R14: ffff8801d8948000 R15: ffff8801d624e6c0
 </IRQ>
 lock_is_held include/linux/lockdep.h:348 [inline]
 schedule_debug kernel/sched/core.c:3169 [inline]
 __schedule+0xf41/0x2070 kernel/sched/core.c:3271
 schedule+0x108/0x440 kernel/sched/core.c:3391
 freezable_schedule include/linux/freezer.h:171 [inline]
 futex_wait_queue_me+0x3ed/0x7e0 kernel/futex.c:2407
 futex_wait+0x357/0xa00 kernel/futex.c:2522
 do_futex+0x1059/0x20a0 kernel/futex.c:3394
 SYSC_futex kernel/futex.c:3454 [inline]
 SyS_futex+0x260/0x390 kernel/futex.c:3422
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x4512e9
RSP: 002b:00007fc63b76acf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00000000007180c8 RCX: 00000000004512e9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000007180c8
RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004b70fc
R13: 00000000ffffffff R14: 0000000020ddf000 R15: 0000000000001000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..