------------[ cut here ]------------
WARNING: CPU: 0 PID: 21231 at net/ipv6/ip6_fib.c:1137 fib6_add+0x20d9/0x2c10 net/ipv6/ip6_fib.c:1137
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 21231 Comm: syz-executor1 Not tainted 4.14.0-rc5+ #95
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 panic+0x1e4/0x417 kernel/panic.c:181
 __warn+0x1c4/0x1d9 kernel/panic.c:542
 report_bug+0x211/0x2d0 lib/bug.c:183
 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:178
 do_trap_no_signal arch/x86/kernel/traps.c:212 [inline]
 do_trap+0x260/0x390 arch/x86/kernel/traps.c:261
 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:298
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:311
 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:905
RIP: 0010:fib6_add+0x20d9/0x2c10 net/ipv6/ip6_fib.c:1137
RSP: 0018:ffff8801c6d7f6a0 EFLAGS: 00010206
RAX: 0000000000010000 RBX: 1ffff10038dafeec RCX: ffffc90003d10000
RDX: 0000000000000240 RSI: ffffffff8434fc19 RDI: ffff8801d934f080
RBP: ffff8801c6d7fa08 R08: 0000000000000000 R09: 0000000000000000
R10: ffff8801c6d7f8d0 R11: ffff8801d04ed5b0 R12: 0000000000000001
R13: dffffc0000000000 R14: ffff8801d934f000 R15: ffff8801c9d841c0
 __ip6_ins_rt+0x6c/0x90 net/ipv6/route.c:1001
 ip6_route_add+0x148/0x1a0 net/ipv6/route.c:2772
 ipv6_route_ioctl+0x4cf/0x690 net/ipv6/route.c:3281
 inet6_ioctl+0xef/0x1e0 net/ipv6/af_inet6.c:521
 sock_do_ioctl+0x65/0xb0 net/socket.c:961
 sock_ioctl+0x2c2/0x440 net/socket.c:1058
 vfs_ioctl fs/ioctl.c:45 [inline]
 do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:685
 SYSC_ioctl fs/ioctl.c:700 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x452869
RSP: 002b:00007f6c49547be8 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452869
RDX: 00000000206bb000 RSI: 000000000000890b RDI: 0000000000000014
RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ee100
R13: 00000000ffffffff R14: 00007f6c495486d4 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..