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-6,10.128.0.37' (ECDSA) to the list of known hosts.
2017/08/15 12:25:23 parsed 1 programs
2017/08/15 12:25:23 executed programs: 0
syzkaller login: [   47.731817] kasan: CONFIG_KASAN_INLINE enabled
[   47.736452] kasan: GPF could be caused by NULL-ptr deref or user memory access
[   47.743949] general protection fault: 0000 [#1] SMP KASAN
[   47.749468] Dumping ftrace buffer:
[   47.752991]    (ftrace buffer empty)
[   47.756663] Modules linked in:
[   47.759824] CPU: 0 PID: 3562 Comm: syz-executor0 Not tainted 4.13.0-rc5-next-20170815+ #3
[   47.768097] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   47.777414] task: ffff8801ccb14300 task.stack: ffff8801cc960000
[   47.783440] RIP: 0010:skb_release_data+0x26c/0x790
[   47.788329] RSP: 0018:ffff8801cc966da8 EFLAGS: 00010207
[   47.793656] RAX: 0e824260409bede2 RBX: dffffc0000000000 RCX: 0000000000000000
[   47.800890] RDX: 0000000000000000 RSI: ffffffff85b34bc0 RDI: 7412130204df6f15
[   47.808122] RBP: ffff8801cc966ec8 R08: ffff8801cd8bbf48 R09: 0000000000000000
[   47.815353] R10: ffff8801cc9676b0 R11: 0000000000000007 R12: ffff8801ce6d01b0
[   47.822589] R13: ffffed003992cdcc R14: 1ffff1003992cdc4 R15: 7412130204df6ef5
[   47.829823] FS:  00007f113dbe7700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   47.838017] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   47.843861] CR2: 0000000020ae3ff4 CR3: 00000001cd88b000 CR4: 00000000001406f0
[   47.851096] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   47.858335] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   47.865568] Call Trace:
[   47.868122]  ? print_usage_bug+0x480/0x480
[   47.872328]  ? skb_tx_error+0x2c0/0x2c0
[   47.876269]  ? __lock_is_held+0xb6/0x140
[   47.880309]  skb_release_all+0x4a/0x60
[   47.884160]  kfree_skb+0x15d/0x4c0
[   47.887661]  ? ip_rcv+0x40a/0x17d0
[   47.891161]  ? __kfree_skb+0x20/0x20
[   47.894848]  ? __is_insn_slot_addr+0x1fc/0x330
[   47.899398]  ? __lock_acquire+0x6aa/0x3bc0
[   47.903599]  ip_rcv+0x40a/0x17d0
[   47.906939]  ? ip_local_deliver+0x6d0/0x6d0
[   47.911230]  ? debug_check_no_locks_freed+0x3c0/0x3c0
[   47.916384]  ? __lock_acquire+0x6aa/0x3bc0
[   47.920583]  ? __free_insn_slot+0x5c0/0x5c0
[   47.924868]  ? __lock_is_held+0xb6/0x140
[   47.928896]  ? ip_local_deliver+0x6d0/0x6d0
[   47.933182]  __netif_receive_skb_core+0x19af/0x33d0
[   47.938162]  ? unwind_get_return_address+0x61/0xa0
[   47.943059]  ? nf_ingress+0x9f0/0x9f0
[   47.946826]  ? save_stack+0xa3/0xd0
[   47.950418]  ? save_stack_trace+0x16/0x20
[   47.954528]  ? save_stack+0x43/0xd0
[   47.958114]  ? kasan_kmalloc+0xad/0xe0
[   47.961961]  ? kasan_slab_alloc+0x12/0x20
[   47.966072]  ? kmem_cache_alloc+0x12e/0x760
[   47.970357]  ? __build_skb+0x9d/0x450
[   47.974118]  ? build_skb+0x6f/0x260
[   47.977709]  ? tun_get_user+0x1db7/0x2150
[   47.981821]  ? tun_chr_write_iter+0xd8/0x190
[   47.986192]  ? __vfs_write+0x684/0x970
[   47.990040]  ? vfs_write+0x189/0x510
[   47.993719]  ? __skb_flow_get_ports+0x151/0x400
[   47.998351]  ? flow_get_u32_dst+0x130/0x130
[   48.002637]  ? find_held_lock+0x35/0x1d0
[   48.006664]  ? __skb_flow_get_ports+0x151/0x400
[   48.011302]  ? check_noncircular+0x20/0x20
[   48.015499]  ? __skb_flow_dissect+0xfa1/0x3ae0
[   48.020046]  ? lock_downgrade+0x990/0x990
[   48.024165]  ? __skb_flow_get_ports+0x400/0x400
[   48.028798]  ? find_held_lock+0x35/0x1d0
[   48.032829]  ? netif_receive_skb_internal+0x1d7/0x5e0
[   48.037987]  ? lock_downgrade+0x990/0x990
[   48.042101]  ? pvclock_read_flags+0x160/0x160
[   48.046563]  ? lock_acquire+0x1d5/0x580
[   48.050500]  ? lock_acquire+0x1d5/0x580
[   48.054437]  ? netif_receive_skb_internal+0x93/0x5e0
[   48.059505]  ? ktime_get_with_offset+0x2c1/0x420
[   48.064229]  ? lock_release+0xa40/0xa40
[   48.068165]  ? do_gettimeofday+0x190/0x190
[   48.072371]  __netif_receive_skb+0x2c/0x1b0
[   48.076661]  ? __netif_receive_skb+0x2c/0x1b0
[   48.081123]  netif_receive_skb_internal+0x10b/0x5e0
[   48.086105]  ? dev_cpu_dead+0xb00/0xb00
[   48.090051]  ? tun_device_event+0xca0/0xca0
[   48.094340]  ? rcu_pm_notify+0xc0/0xc0
[   48.098200]  netif_receive_skb+0xae/0x390
[   48.102314]  ? netif_receive_skb_internal+0x5e0/0x5e0
[   48.107472]  ? futex_wait_setup+0x3d0/0x3d0
[   48.111761]  ? tun_rx_batched.isra.43+0x5bd/0x860
[   48.116574]  tun_rx_batched.isra.43+0x5e7/0x860
[   48.121212]  ? skb_get_hash_perturb+0x9d0/0x9d0
[   48.125845]  ? tun_sock_write_space+0x370/0x370
[   48.130480]  ? security_file_alloc+0x6d/0xa0
[   48.134857]  ? tun_free_netdev+0x1b0/0x1b0
[   48.139066]  ? check_noncircular+0x20/0x20
[   48.143268]  tun_get_user+0x11dd/0x2150
[   48.147218]  ? tun_flow_update+0xf70/0xf70
[   48.151421]  ? __tun_get+0x1ab/0x2e0
[   48.155098]  ? lock_downgrade+0x990/0x990
[   48.159210]  ? lock_release+0xa40/0xa40
[   48.163157]  ? __lock_is_held+0xb6/0x140
[   48.167187]  ? __tun_get+0x1d4/0x2e0
[   48.170861]  ? tun_chr_close+0x60/0x60
[   48.174715]  tun_chr_write_iter+0xd8/0x190
[   48.178918]  __vfs_write+0x684/0x970
[   48.182597]  ? default_llseek+0x290/0x290
[   48.186721]  ? _cond_resched+0x14/0x30
[   48.190576]  ? avc_policy_seqno+0x9/0x20
[   48.194608]  ? selinux_file_permission+0x82/0x460
[   48.199435]  ? rw_verify_area+0xe5/0x2b0
[   48.203468]  ? __fdget_raw+0x20/0x20
[   48.207147]  vfs_write+0x189/0x510
[   48.210651]  SyS_write+0xef/0x220
[   48.214070]  ? SyS_socket+0x137/0x200
[   48.217835]  ? SyS_read+0x220/0x220
[   48.221435]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   48.226417]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[   48.231144]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   48.235862] RIP: 0033:0x40b751
[   48.239017] RSP: 002b:00007f113dbe6c10 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
[   48.246688] RAX: ffffffffffffffda RBX: 0000000000718150 RCX: 000000000040b751
[   48.253921] RDX: 000000000000003a RSI: 0000000020d96000 RDI: 0000000000000003
[   48.261155] RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000
[   48.268392] R10: 00000000000f4246 R11: 0000000000000293 R12: 0000000000000000
[   48.275627] R13: 0000000000a6f7ef R14: 00007f113dbe79c0 R15: 0000000000000002
[   48.282868] Code: c6 e8 c9 78 8d fd 4c 89 e0 48 c1 e8 03 80 3c 18 00 0f 85 93 04 00 00 4d 8b 3c 24 41 c6 45 00 00 49 8d 7f 20 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 6b 04 00 00 41 80 7d 00 00 49 8b 47 20 0f 85 
[   48.301945] RIP: skb_release_data+0x26c/0x790 RSP: ffff8801cc966da8
[   48.308352] ---[ end trace 543d9d0af6edf478 ]---
[   48.313082] Kernel panic - not syncing: Fatal exception in interrupt
[   48.319816] Dumping ftrace buffer:
[   48.323325]    (ftrace buffer empty)
[   48.327004] Kernel Offset: disabled
[   48.330595] Rebooting in 86400 seconds..