[info] Using makefile-style concurrent boot in runlevel 2.
[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[    9.402985] sshd (2906) used greatest stack depth: 14592 bytes left
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

Warning: Permanently added 'ci-upstream-mmots-kasan-gce-4,10.128.0.9' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   48.302435] ------------[ cut here ]------------
[   48.303241] WARNING: CPU: 0 PID: 2994 at net/ipv6/ip6_fib.c:1137 fib6_add+0x20d9/0x2c10
[   48.304424] Kernel panic - not syncing: panic_on_warn set ...
[   48.304424] 
[   48.305462] CPU: 0 PID: 2994 Comm: syzkaller781077 Not tainted 4.14.0-rc5-mm1+ #20
[   48.306538] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   48.307770] Call Trace:
[   48.308130]  dump_stack+0x194/0x257
[   48.308622]  ? arch_local_irq_restore+0x53/0x53
[   48.309249]  ? vsnprintf+0x1ed/0x1900
[   48.309785]  panic+0x1e4/0x41c
[   48.310218]  ? refcount_error_report+0x214/0x214
[   48.310852]  ? show_regs_print_info+0x65/0x65
[   48.311459]  ? __warn+0x1a9/0x1e0
[   48.311950]  ? fib6_add+0x20d9/0x2c10
[   48.312460]  __warn+0x1c4/0x1e0
[   48.312904]  ? fib6_add+0x20d9/0x2c10
[   48.313429]  report_bug+0x211/0x2d0
[   48.313942]  fixup_bug+0x40/0x90
[   48.314398]  do_trap+0x260/0x390
[   48.314861]  do_error_trap+0x120/0x390
[   48.315387]  ? do_trap+0x390/0x390
[   48.315878]  ? fib6_add+0x20d9/0x2c10
[   48.316390]  ? __lock_is_held+0xb6/0x140
[   48.316941]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   48.317591]  do_invalid_op+0x1b/0x20
[   48.318137]  invalid_op+0x18/0x20
[   48.318602] RIP: 0010:fib6_add+0x20d9/0x2c10
[   48.319187] RSP: 0018:ffff8801d21a76a0 EFLAGS: 00010293
[   48.319898] RAX: ffff8801d23725c0 RBX: 1ffff1003a434eec RCX: ffffffff8441b159
[   48.320852] RDX: 0000000000000000 RSI: ffff8801c048d380 RDI: ffff8801c048d400
[   48.321805] RBP: ffff8801d21a7a08 R08: 0000000000000000 R09: 0000000000000004
[   48.323922] R10: ffff8801d21a78d0 R11: 0000000000000003 R12: 0000000000000001
[   48.331159] R13: dffffc0000000000 R14: ffff8801c048d380 R15: ffffffff86027940
[   48.338408]  ? fib6_add+0x20d9/0x2c10
[   48.342193]  ? __lock_is_held+0xb6/0x140
[   48.346227]  ? fib6_force_start_gc+0xf0/0xf0
[   48.350609]  ? rt6_info_init+0x96/0x1e0
[   48.354552]  ? lock_downgrade+0x990/0x990
[   48.358680]  ? dst_alloc+0x14a/0x1a0
[   48.362368]  ? __alloc_percpu_gfp+0x27/0x30
[   48.366665]  ? lock_acquire+0x1d5/0x580
[   48.370608]  ? lock_acquire+0x1d5/0x580
[   48.374549]  ? __ip6_ins_rt+0x56/0x90
[   48.378318]  ? ip6_convert_metrics.isra.70+0x518/0x6b0
[   48.383564]  ? lock_release+0xa40/0xa40
[   48.387506]  ? rt6_uncached_list_add+0x240/0x240
[   48.392232]  ? __might_fault+0x110/0x1d0
[   48.396259]  ? lock_downgrade+0x990/0x990
[   48.400377]  ? __ip6_ins_rt+0x56/0x90
[   48.404151]  __ip6_ins_rt+0x6c/0x90
[   48.407750]  ip6_route_add+0x148/0x1a0
[   48.411604]  ? icmp6_dst_alloc+0x630/0x630
[   48.415814]  ipv6_route_ioctl+0x4cf/0x690
[   48.419932]  ? rt6_purge_dflt_routers+0x9d0/0x9d0
[   48.424781]  inet6_ioctl+0xef/0x1e0
[   48.428373]  ? inet6_ioctl+0xef/0x1e0
[   48.432144]  sock_do_ioctl+0x65/0xb0
[   48.435838]  sock_ioctl+0x2c2/0x440
[   48.439434]  ? dlci_ioctl_set+0x40/0x40
[   48.443375]  do_vfs_ioctl+0x1b1/0x1520
[   48.447228]  ? _cond_resched+0x14/0x30
[   48.451089]  ? ioctl_preallocate+0x2b0/0x2b0
[   48.455468]  ? selinux_capable+0x40/0x40
[   48.459504]  ? __fd_install+0x66b/0x6a0
[   48.463447]  ? sock_map_fd+0x53/0x70
[   48.467136]  ? security_file_ioctl+0x89/0xb0
[   48.471512]  SyS_ioctl+0x8f/0xc0
[   48.474850]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   48.479573] RIP: 0033:0x43ff59
[   48.482731] RSP: 002b:00007ffc28b3f208 EFLAGS: 00000213 ORIG_RAX: 0000000000000010
[   48.490403] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043ff59
[   48.497639] RDX: 00000000206bb000 RSI: 000000000000890b RDI: 0000000000000003
[   48.504873] RBP: 0000000000000082 R08: 0000000000000000 R09: 00000000004018c0
[   48.512109] R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004018c0
[   48.519345] R13: 0000000000401950 R14: 0000000000000000 R15: 0000000000000000
[   48.527222] Dumping ftrace buffer:
[   48.530771]    (ftrace buffer empty)
[   48.534448] Kernel Offset: disabled
[   48.538044] Rebooting in 86400 seconds..