------------[ cut here ]------------
WARNING: CPU: 1 PID: 6015 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: 1 PID: 6015 Comm: syz-executor0 Not tainted 4.14.0-rc4-mm1+ #16
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+0x1e4/0x41c kernel/panic.c:181
 __warn+0x1c4/0x1e0 kernel/panic.c:544
 report_bug+0x211/0x2d0 lib/bug.c:183
 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:177
 do_trap_no_signal arch/x86/kernel/traps.c:211 [inline]
 do_trap+0x260/0x390 arch/x86/kernel/traps.c:260
 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:297
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:310
 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:ffff8801c1aa76a0 EFLAGS: 00010216
RAX: 00000000000001ee RBX: 1ffff10038354eec RCX: ffffc90001826000
RDX: 0000000000010000 RSI: ffffffff84364009 RDI: ffff8801c9d4b5c0
RBP: ffff8801c1aa7a08 R08: 0000000000000000 R09: ffff8801c1aa7360
R10: ffff8801c1aa72d8 R11: 1ffff1003837773b R12: 0000000000000001
R13: dffffc0000000000 R14: ffff8801c9d4b540 R15: ffff88019fbe4040
 __ip6_ins_rt+0x6c/0x90 net/ipv6/route.c:1011
 ip6_route_add+0x148/0x1a0 net/ipv6/route.c:2768
 ipv6_route_ioctl+0x4d5/0x690 net/ipv6/route.c:3277
 inet6_ioctl+0xef/0x1e0 net/ipv6/af_inet6.c:521
 sock_do_ioctl+0x65/0xb0 net/socket.c:960
 sock_ioctl+0x2c2/0x440 net/socket.c:1057
 vfs_ioctl fs/ioctl.c:45 [inline]
 do_vfs_ioctl+0x1b1/0x1530 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: 0033:0x4520a9
RSP: 002b:00007f86fc6d2c08 EFLAGS: 00000216 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000007180b0 RCX: 00000000004520a9
RDX: 0000000020fc7000 RSI: 000000000000890b RDI: 0000000000000006
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000216 R12: 0000000000000000
R13: 0000000000a6f7ef R14: 00007f86fc6d39c0 R15: 0000000000000004
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..