INIT: Entering runlevel: 2

[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.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

Warning: Permanently added 'ci-upstream-next-kasan-gce-4,10.128.0.30' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   39.990866] kasan: CONFIG_KASAN_INLINE enabled
[   39.991652] kasan: GPF could be caused by NULL-ptr deref or user memory access
[   39.992663] general protection fault: 0000 [#1] SMP KASAN
[   39.993395] Dumping ftrace buffer:
[   39.993881]    (ftrace buffer empty)
[   39.994375] Modules linked in:
[   39.994827] CPU: 1 PID: 3087 Comm: syzkaller524312 Not tainted 4.15.0-rc2-next-20171207+ #61
[   39.996006] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   39.997243] RIP: 0010:string+0xb4/0x200
[   39.997771] RSP: 0018:ffff8801cc3c7868 EFLAGS: 00010006
[   39.998481] RAX: dffffc0000000000 RBX: fffffffffffffffe RCX: ffffffff8515b91f
[   39.999444] RDX: 0dee8c6cadcdcde8 RSI: 1ffff10039878f01 RDI: ffff8801cc3c7888
[   40.000395] RBP: ffff8801cc3c78b8 R08: ffffed0039758c9e R09: ffffed0039758c9e
[   40.001348] R10: 0000000000000002 R11: ffffed0039758c9d R12: 6f7463656e6e6f44
[   40.002299] R13: 6f7463656e6e6f43 R14: ffffffffffffffff R15: ffff8801cbac64ea
[   40.003252] FS:  0000000000f99880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
[   40.004354] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   40.005130] CR2: 0000000020460ffc CR3: 00000001ccdee000 CR4: 00000000001406e0
[   40.006084] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   40.007036] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   40.007987] Call Trace:
[   40.008343]  ? format_decode+0x10a/0x830
[   40.008889]  vsnprintf+0x863/0x1900
[   40.009381]  ? pointer+0x9e0/0x9e0
[   40.009872]  ? lock_release+0xda0/0xda0
[   40.010427]  seq_vprintf+0xe3/0x1a0
[   40.010916]  seq_printf+0xb3/0xe0
[   40.013758]  ? seq_vprintf+0x1a0/0x1a0
[   40.017612]  ? __lock_task_sighand+0x22f/0x6e0
[   40.022164]  ? zap_other_threads+0x240/0x240
[   40.026544]  ? kasan_kmalloc+0xad/0xe0
[   40.030404]  show_timer+0x1ee/0x2b0
[   40.033998]  ? timers_start+0x14c/0x1c0
[   40.037943]  seq_read+0x385/0x13d0
[   40.041460]  ? seq_lseek+0x3c0/0x3c0
[   40.045146]  ? selinux_file_permission+0x82/0x460
[   40.049972]  ? security_file_permission+0x89/0x1f0
[   40.054870]  ? rw_verify_area+0xe5/0x2b0
[   40.058898]  do_iter_read+0x3db/0x5b0
[   40.062666]  ? dup_iter+0x260/0x260
[   40.066264]  vfs_readv+0x121/0x1c0
[   40.069774]  ? compat_rw_copy_check_uvector+0x2e0/0x2e0
[   40.075103]  ? lock_release+0xda0/0xda0
[   40.079045]  ? trace_event_raw_event_sched_switch+0x800/0x800
[   40.084898]  ? fget_raw+0x20/0x20
[   40.088318]  ? __might_sleep+0x95/0x190
[   40.092262]  ? kasan_check_write+0x14/0x20
[   40.096462]  ? _copy_from_user+0x99/0x110
[   40.100582]  do_preadv+0x11b/0x1a0
[   40.104101]  ? do_preadv+0x11b/0x1a0
[   40.107786]  SyS_preadv+0x30/0x40
[   40.111208]  entry_SYSCALL_64_fastpath+0x1f/0x96
[   40.115932] RIP: 0033:0x440159
[   40.119089] RSP: 002b:00007ffe1f83f2d8 EFLAGS: 00000217 ORIG_RAX: 0000000000000127
[   40.126760] RAX: ffffffffffffffda RBX: 00007ffe1f83f2e0 RCX: 0000000000440159
[   40.133996] RDX: 0000000000000001 RSI: 00000000205e2ff0 RDI: 0000000000000003
[   40.141232] RBP: 0000000000000000 R08: 65732f636f72702f R09: 65732f636f72702f
[   40.148467] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401a20
[   40.155703] R13: 0000000000401ab0 R14: 0000000000000000 R15: 0000000000000000
[   40.162951] Code: 01 00 00 e8 bf 81 5a fc 4d 85 f6 0f 84 10 01 00 00 e8 b1 81 5a fc 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 4d 8d 65 01 48 c1 ea 03 <0f> b6 04 02 4c 89 ea 83 e2 07 38 d0 7f 08 84 c0 0f 85 ec 00 00 
[   40.182037] RIP: string+0xb4/0x200 RSP: ffff8801cc3c7868
[   40.187460] ---[ end trace a99b0586567e56dc ]---
[   40.192180] Kernel panic - not syncing: Fatal exception
[   40.197555] Dumping ftrace buffer:
[   40.201068]    (ftrace buffer empty)
[   40.204760] Kernel Offset: disabled
[   40.208353] Rebooting in 86400 seconds..