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-2,10.128.0.47' (ECDSA) to the list of known hosts. 2017/08/15 15:05:31 parsed 1 programs 2017/08/15 15:05:31 executed programs: 0 syzkaller login: [ 38.355998] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 38.373645] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 38.392605] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 38.420478] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 38.445737] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 38.472760] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 38.502467] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 38.530677] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 38.557713] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 38.585039] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 38.613930] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 38.642188] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 38.668542] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 38.695563] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 38.723463] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 38.751760] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 38.779575] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 38.804357] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 38.829812] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 38.856758] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 38.884176] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 38.909296] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 38.937852] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 38.962977] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 38.987153] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.013791] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.041255] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.068144] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.094942] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.122311] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.148109] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.174214] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.201279] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.226726] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.251631] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.276975] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.303350] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.330914] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.358152] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.384971] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.410777] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.437183] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.464028] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.493751] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.524522] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.553061] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.578890] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.607830] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.636167] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.665232] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.695450] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.722704] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.750272] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.779861] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.811372] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.839981] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.866645] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.893965] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.924854] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.954727] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 39.984514] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.011454] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.039996] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.069526] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.099283] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.125658] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.157929] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.183926] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.211103] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.237404] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.263105] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.290627] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.321157] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.348598] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.373370] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.401329] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.426714] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.453925] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.483052] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.510271] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.538329] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.565782] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.591890] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.616733] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.644047] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.672154] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.702209] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.732806] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.761843] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.790156] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.819222] TCP: request_sock_TCP: Possible SYN flooding on port 20000. Sending cookies. Check SNMP counters. [ 40.836533] kasan: CONFIG_KASAN_INLINE enabled [ 40.841159] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 40.848542] general protection fault: 0000 [#1] SMP KASAN [ 40.854056] Dumping ftrace buffer: [ 40.857564] (ftrace buffer empty) [ 40.861244] Modules linked in: [ 40.864407] CPU: 1 PID: 3796 Comm: syz-executor0 Not tainted 4.13.0-rc5-next-20170815+ #3 [ 40.872691] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.882015] task: ffff8801c755e040 task.stack: ffff8801c7470000 [ 40.888044] RIP: 0010:skb_release_data+0x26c/0x790 [ 40.892933] RSP: 0018:ffff8801c7476bd0 EFLAGS: 00010206 [ 40.898261] RAX: 00d70cb5b39acdeb RBX: dffffc0000000000 RCX: 0000000000000000 [ 40.905504] RDX: 0000000000000000 RSI: ffff8801c755e8c0 RDI: 06b865ad9cd66f59 [ 40.912745] RBP: ffff8801c7476cf0 R08: 0000000000000001 R09: 0000000000000000 [ 40.919982] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801ce5681b0 [ 40.927217] R13: ffffed0038e8ed91 R14: 1ffff10038e8ed89 R15: 06b865ad9cd66f39 [ 40.934456] FS: 00007f39f0e74700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 40.942646] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.948500] CR2: 00007fcacf06f2b8 CR3: 00000001c8e53000 CR4: 00000000001406e0 [ 40.955738] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 40.962978] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 40.970212] Call Trace: [ 40.972770] ? skb_tx_error+0x2c0/0x2c0 [ 40.976714] ? call_rcu_sched+0x12/0x20 [ 40.980653] ? dst_release+0x5d/0x90 [ 40.984333] skb_release_all+0x4a/0x60 [ 40.988186] kfree_skb+0x15d/0x4c0 [ 40.991690] ? ip_rcv_finish+0x587/0x19c0 [ 40.995800] ? __kfree_skb+0x20/0x20 [ 40.999479] ? ip_forward+0x1c10/0x1c10 [ 41.003421] ? ip_route_input_rcu+0x3210/0x3210 [ 41.008070] ? tcp_v4_send_synack+0x270/0x270 [ 41.012535] ip_rcv_finish+0x587/0x19c0 [ 41.016474] ? iptable_nat_ipv4_fn+0x40/0x40 [ 41.020855] ? ip_local_deliver_finish+0xba0/0xba0 [ 41.025756] ? ip_rcv+0xf05/0x17d0 [ 41.029263] ? lock_downgrade+0x990/0x990 [ 41.033374] ? tcp_v4_send_synack+0x270/0x270 [ 41.037835] ? rcu_read_lock_held+0xa9/0xc0 [ 41.042131] ? nf_hook_slow+0x12d/0x290 [ 41.046079] ip_rcv+0xc3f/0x17d0 [ 41.049423] ? ip_local_deliver+0x6d0/0x6d0 [ 41.053712] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 41.058871] ? __lock_acquire+0x6aa/0x3bc0 [ 41.063076] ? ip_local_deliver_finish+0xba0/0xba0 [ 41.067973] ? ip_local_deliver+0x6d0/0x6d0 [ 41.072262] __netif_receive_skb_core+0x19af/0x33d0 [ 41.077246] ? unwind_get_return_address+0x61/0xa0 [ 41.082146] ? nf_ingress+0x9f0/0x9f0 [ 41.085916] ? save_stack+0xa3/0xd0 [ 41.089513] ? save_stack_trace+0x16/0x20 [ 41.093625] ? save_stack+0x43/0xd0 [ 41.097215] ? kasan_kmalloc+0xad/0xe0 [ 41.101082] ? kasan_slab_alloc+0x12/0x20 [ 41.105193] ? kmem_cache_alloc+0x12e/0x760 [ 41.109480] ? __build_skb+0x9d/0x450 [ 41.113244] ? build_skb+0x6f/0x260 [ 41.116836] ? tun_get_user+0x1db7/0x2150 [ 41.120948] ? tun_chr_write_iter+0xd8/0x190 [ 41.125319] ? __vfs_write+0x684/0x970 [ 41.129169] ? vfs_write+0x189/0x510 [ 41.133364] ? __skb_flow_get_ports+0x151/0x400 [ 41.137999] ? flow_get_u32_dst+0x130/0x130 [ 41.142290] ? __skb_flow_get_ports+0x151/0x400 [ 41.146931] ? check_noncircular+0x20/0x20 [ 41.151133] ? __skb_flow_dissect+0xfa1/0x3ae0 [ 41.155681] ? __sched_text_start+0x8/0x8 [ 41.159802] ? __skb_flow_get_ports+0x400/0x400 [ 41.164438] ? find_held_lock+0x35/0x1d0 [ 41.168467] ? netif_receive_skb_internal+0x1d7/0x5e0 [ 41.173634] ? lock_downgrade+0x990/0x990 [ 41.177764] ? pvclock_read_flags+0x160/0x160 [ 41.182240] ? lock_acquire+0x1d5/0x580 [ 41.186182] ? lock_acquire+0x1d5/0x580 [ 41.190129] ? netif_receive_skb_internal+0x93/0x5e0 [ 41.195206] ? ktime_get_with_offset+0x2c1/0x420 [ 41.199929] ? lock_release+0xa40/0xa40 [ 41.203869] ? do_gettimeofday+0x190/0x190 [ 41.208074] __netif_receive_skb+0x2c/0x1b0 [ 41.212362] ? __netif_receive_skb+0x2c/0x1b0 [ 41.216822] netif_receive_skb_internal+0x10b/0x5e0 [ 41.221805] ? dev_cpu_dead+0xb00/0xb00 [ 41.225754] ? tun_device_event+0xca0/0xca0 [ 41.230051] ? rcu_pm_notify+0xc0/0xc0 [ 41.233916] netif_receive_skb+0xae/0x390 [ 41.238030] ? netif_receive_skb_internal+0x5e0/0x5e0 [ 41.243186] ? mark_wake_futex+0xc0/0x1c0 [ 41.247301] ? futex_wait_setup+0x3d0/0x3d0 [ 41.251596] ? tun_rx_batched.isra.43+0x5bd/0x860 [ 41.256403] tun_rx_batched.isra.43+0x5e7/0x860 [ 41.261037] ? skb_get_hash_perturb+0x9d0/0x9d0 [ 41.265668] ? tun_sock_write_space+0x370/0x370 [ 41.270301] ? tun_free_netdev+0x1b0/0x1b0 [ 41.274503] ? check_noncircular+0x20/0x20 [ 41.278705] tun_get_user+0x11dd/0x2150 [ 41.282655] ? tun_flow_update+0xf70/0xf70 [ 41.286870] ? __tun_get+0x1ab/0x2e0 [ 41.290549] ? lock_downgrade+0x990/0x990 [ 41.294664] ? lock_release+0xa40/0xa40 [ 41.298603] ? __lock_is_held+0xb6/0x140 [ 41.302640] ? __tun_get+0x1d4/0x2e0 [ 41.306320] ? tun_chr_close+0x60/0x60 [ 41.310177] tun_chr_write_iter+0xd8/0x190 [ 41.314380] __vfs_write+0x684/0x970 [ 41.318061] ? default_llseek+0x290/0x290 [ 41.322176] ? _cond_resched+0x14/0x30 [ 41.326032] ? avc_policy_seqno+0x9/0x20 [ 41.330058] ? selinux_file_permission+0x82/0x460 [ 41.334869] ? rw_verify_area+0xe5/0x2b0 [ 41.338914] ? __fdget_raw+0x20/0x20 [ 41.342594] vfs_write+0x189/0x510 [ 41.346101] SyS_write+0xef/0x220 [ 41.349519] ? SyS_read+0x220/0x220 [ 41.353111] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 41.358094] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 41.362819] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 41.367538] RIP: 0033:0x40b751 [ 41.370692] RSP: 002b:00007f39f0e73c10 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 [ 41.378364] RAX: ffffffffffffffda RBX: 0000000000718150 RCX: 000000000040b751 [ 41.385600] RDX: 0000000000000036 RSI: 0000000020002000 RDI: 0000000000000003 [ 41.392835] RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 [ 41.400068] R10: 00000000000f4246 R11: 0000000000000293 R12: 00000000004bab2d [ 41.407309] R13: 00000000ffffffff R14: 000000002000bff8 R15: 0000000000000091 [ 41.414550] 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 [ 41.433607] RIP: skb_release_data+0x26c/0x790 RSP: ffff8801c7476bd0 [ 41.440023] ---[ end trace 414acaae88542322 ]--- [ 41.445069] Kernel panic - not syncing: Fatal exception in interrupt [ 41.452056] Dumping ftrace buffer: [ 41.455571] (ftrace buffer empty) [ 41.459249] Kernel Offset: disabled [ 41.462840] Rebooting in 86400 seconds..