[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 39.969798] audit: type=1800 audit(1550712244.758:25): pid=7801 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 39.996371] audit: type=1800 audit(1550712244.758:26): pid=7801 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 40.031022] audit: type=1800 audit(1550712244.768:27): pid=7801 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] 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 '10.128.0.103' (ECDSA) to the list of known hosts. syzkaller login: [ 52.322913] IPVS: ftp: loaded support on port[0] = 21 [ 52.330065] IPVS: ftp: loaded support on port[0] = 21 [ 52.334813] IPVS: ftp: loaded support on port[0] = 21 [ 52.348350] IPVS: ftp: loaded support on port[0] = 21 [ 52.357124] IPVS: ftp: loaded support on port[0] = 21 [ 52.366212] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 54.043260] cgroup: fork rejected by pids controller in /syz0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 54.098163] cgroup: fork rejected by pids controller in /syz4 [ 54.103740] cgroup: fork rejected by pids controller in /syz1 [ 54.116882] cgroup: fork rejected by pids controller in /syz5 [ 54.118592] cgroup: fork rejected by pids controller in /syz3 [ 54.131785] cgroup: fork rejected by pids controller in /syz2 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 55.916953] WARNING: CPU: 1 PID: 2620 at net/ipv6/xfrm6_tunnel.c:351 xfrm6_tunnel_net_exit+0x1df/0x370 [ 55.926560] Kernel panic - not syncing: panic_on_warn set ... [ 55.932442] CPU: 1 PID: 2620 Comm: kworker/u4:4 Not tainted 5.0.0-rc7+ #80 [ 55.939441] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.948805] Workqueue: netns cleanup_net [ 55.952845] Call Trace: [ 55.955436] dump_stack+0x172/0x1f0 [ 55.959063] ? xfrm6_tunnel_net_exit+0x1c0/0x370 [ 55.963802] panic+0x2cb/0x65c [ 55.966982] ? __warn_printk+0xf3/0xf3 [ 55.970868] ? xfrm6_tunnel_net_exit+0x1df/0x370 [ 55.975615] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 55.981150] ? __warn.cold+0x5/0x45 [ 55.984777] ? __warn+0xe8/0x1d0 [ 55.988134] ? xfrm6_tunnel_net_exit+0x1df/0x370 [ 55.992873] __warn.cold+0x20/0x45 [ 55.996422] ? xfrm6_tunnel_net_exit+0x1df/0x370 [ 56.001169] report_bug+0x263/0x2b0 [ 56.004782] do_error_trap+0x11b/0x200 [ 56.008667] do_invalid_op+0x37/0x50 [ 56.012366] ? xfrm6_tunnel_net_exit+0x1df/0x370 [ 56.017108] invalid_op+0x14/0x20 [ 56.020551] RIP: 0010:xfrm6_tunnel_net_exit+0x1df/0x370 [ 56.025900] Code: 4c 89 e0 48 c1 e8 03 42 80 3c 38 00 0f 85 73 01 00 00 4d 8b 34 24 31 ff 4c 89 f6 e8 0b b0 55 fb 4d 85 f6 74 b3 e8 61 ae 55 fb <0f> 0b eb aa 48 81 c3 00 08 00 00 45 31 e4 49 be 00 00 00 00 00 fc [ 56.044807] RSP: 0018:ffff8880a082fbe0 EFLAGS: 00010293 [ 56.050158] RAX: ffff8880a081a2c0 RBX: ffff88808819dac0 RCX: ffffffff861a3315 [ 56.057417] RDX: 0000000000000000 RSI: ffffffff861a331f RDI: 0000000000000007 [ 56.064674] RBP: ffff8880a082fc08 R08: ffff8880a081a2c0 R09: ffff8880a081abb0 [ 56.071939] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88808819e2b8 [ 56.079194] R13: 00000000000000ff R14: ffff888097e7ef00 R15: dffffc0000000000 [ 56.086474] ? xfrm6_tunnel_net_exit+0x1d5/0x370 [ 56.091212] ? xfrm6_tunnel_net_exit+0x1df/0x370 [ 56.095956] ? xfrm6_tunnel_alloc_spi+0x920/0x920 [ 56.100790] ops_exit_list.isra.0+0xb0/0x160 [ 56.105184] cleanup_net+0x3fb/0x960 [ 56.108898] ? netns_install+0x1d0/0x1d0 [ 56.112941] ? __lock_is_held+0xb6/0x140 [ 56.116983] ? check_preemption_disabled+0x48/0x290 [ 56.122007] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 56.127448] process_one_work+0x98e/0x1790 [ 56.131671] ? pwq_dec_nr_in_flight+0x320/0x320 [ 56.136321] ? lock_acquire+0x16f/0x3f0 [ 56.140282] worker_thread+0x98/0xe40 [ 56.144063] ? trace_hardirqs_on+0x67/0x230 [ 56.148389] kthread+0x357/0x430 [ 56.151745] ? process_one_work+0x1790/0x1790 [ 56.156224] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 56.161746] ret_from_fork+0x3a/0x50 [ 56.166688] Kernel Offset: disabled [ 56.170392] Rebooting in 86400 seconds..