executing program
syzkaller login: [   21.949963] ------------[ cut here ]------------
[   21.950364] WARNING: CPU: 1 PID: 3033 at net/ipv6/ip6_fib.c:1137 fib6_add+0x20d9/0x2c10
[   21.950852] Kernel panic - not syncing: panic_on_warn set ...
[   21.950852] 
[   21.951288] CPU: 1 PID: 3033 Comm: syzkaller572535 Not tainted 4.14.0-rc5-next-20171018+ #8
[   21.951937] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[   21.952699] Call Trace:
[   21.952889]  dump_stack+0x194/0x257
[   21.953148]  ? arch_local_irq_restore+0x53/0x53
[   21.953486]  ? vsnprintf+0x1ed/0x1900
[   21.953783]  panic+0x1e4/0x41c
[   21.954081]  ? refcount_error_report+0x214/0x214
[   21.954511]  ? show_regs_print_info+0x65/0x65
[   21.954850]  ? __warn+0x1a9/0x1e0
[   21.955109]  ? fib6_add+0x20d9/0x2c10
[   21.955388]  __warn+0x1c4/0x1e0
[   21.955628]  ? fib6_add+0x20d9/0x2c10
[   21.955909]  report_bug+0x211/0x2d0
[   21.956184]  fixup_bug+0x40/0x90
[   21.956435]  do_trap+0x260/0x390
[   21.956689]  do_error_trap+0x120/0x390
[   21.956978]  ? do_trap+0x390/0x390
[   21.957240]  ? fib6_add+0x20d9/0x2c10
[   21.957520]  ? __lock_is_held+0xb6/0x140
[   21.957825]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   21.958131]  do_invalid_op+0x1b/0x20
[   21.958352]  invalid_op+0x18/0x20
[   21.958557] RIP: 0010:fib6_add+0x20d9/0x2c10
[   21.958814] RSP: 0018:ffff880066c076a0 EFLAGS: 00010293
[   21.959128] RAX: ffff88006d3c66c0 RBX: 1ffff1000cd80eec RCX: ffffffff8441a159
[   21.959554] RDX: 0000000000000000 RSI: ffff880039719e00 RDI: ffff880039719e80
[   21.959974] RBP: ffff880066c07a08 R08: 0000000000000000 R09: 0000000000001814
[   21.960532] R10: ffff880066c078d0 R11: dffffc0000000000 R12: 0000000000000001
[   21.961056] R13: dffffc0000000000 R14: ffff880039719e00 R15: ffffffff86027680
[   21.961587]  ? fib6_add+0x20d9/0x2c10
[   21.961876]  ? __lock_is_held+0xb6/0x140
[   21.962181]  ? fib6_force_start_gc+0xf0/0xf0
[   21.962505]  ? rt6_info_init+0x96/0x1e0
[   21.962796]  ? lock_downgrade+0x990/0x990
[   21.963108]  ? dst_alloc+0x14a/0x1a0
[   21.963388]  ? __alloc_percpu_gfp+0x27/0x30
[   21.964027]  ? lock_acquire+0x1d5/0x580
[   21.964319]  ? lock_acquire+0x1d5/0x580
[   21.964613]  ? __ip6_ins_rt+0x56/0x90
[   21.964889]  ? ip6_convert_metrics.isra.70+0x518/0x6b0
[   21.965275]  ? lock_release+0xa40/0xa40
[   21.965564]  ? rt6_uncached_list_add+0x240/0x240
[   21.965914]  ? __might_fault+0x110/0x1d0
[   21.966226]  ? lock_downgrade+0x990/0x990
[   21.966524]  ? __ip6_ins_rt+0x56/0x90
[   21.966803]  __ip6_ins_rt+0x6c/0x90
[   21.967070]  ip6_route_add+0x148/0x1a0
[   21.967351]  ? icmp6_dst_alloc+0x630/0x630
[   21.967668]  ipv6_route_ioctl+0x4cf/0x690
[   21.967975]  ? rt6_purge_dflt_routers+0x9d0/0x9d0
[   21.968360]  inet6_ioctl+0xef/0x1e0
[   21.968628]  ? inet6_ioctl+0xef/0x1e0
[   21.968907]  sock_do_ioctl+0x65/0xb0
[   21.969180]  sock_ioctl+0x2c2/0x440
[   21.969478]  ? dlci_ioctl_set+0x40/0x40
[   21.969840]  do_vfs_ioctl+0x1b1/0x1520
[   21.970193]  ? _cond_resched+0x14/0x30
[   21.970549]  ? ioctl_preallocate+0x2b0/0x2b0
[   21.970954]  ? selinux_capable+0x40/0x40
[   21.971333]  ? __fd_install+0x69b/0x6a0
[   21.971701]  ? sock_map_fd+0x53/0x70
[   21.972053]  ? security_file_ioctl+0x89/0xb0
[   21.972460]  SyS_ioctl+0x8f/0xc0
[   21.972774]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   21.973207] RIP: 0033:0x435109
[   21.973497] RSP: 002b:00007ffdc8e1cb38 EFLAGS: 00000213 ORIG_RAX: 0000000000000010
[   21.974200] RAX: ffffffffffffffda RBX: 00000000004002b0 RCX: 0000000000435109
[   21.974862] RDX: 00000000206bb000 RSI: 000000000000890b RDI: 0000000000000003
[   21.975523] RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
[   21.976184] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000000000
[   21.976833] R13: 0000000000401a80 R14: 0000000000401b10 R15: 0000000000000000
[   21.977584] Dumping ftrace buffer:
[   21.977940]    (ftrace buffer empty)
[   21.978273] Kernel Offset: disabled
[   21.978599] Rebooting in 86400 seconds..