[....] Starting enhanced syslogd: rsyslogd[ 11.391274] audit: type=1400 audit(1516633111.446:4): avc: denied { syslog } for pid=3170 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.23' (ECDSA) to the list of known hosts. executing program executing program executing program syzkaller login: [ 28.137405] ------------[ cut here ]------------ [ 28.142210] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x5f6/0x7b0 [ 28.150704] Kernel panic - not syncing: panic_on_warn set ... [ 28.150704] [ 28.158042] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.77-ge12a9c4 #27 [ 28.164939] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.174266] ffff8801db207cb8 ffffffff81d941c9 ffffffff83a47bc0 ffff8801db207d90 [ 28.182267] ffffffff83f2f000 ffffffff832ebc36 0000000000000009 ffff8801db207d80 [ 28.190245] ffffffff8142f3c1 0000000041b58ab3 ffffffff8418ab70 ffffffff8142f205 [ 28.198214] Call Trace: [ 28.200772] [ 28.202810] [] dump_stack+0xc1/0x128 [ 28.208160] [] ? inet_sock_destruct+0x5f6/0x7b0 [ 28.214449] [] panic+0x1bc/0x3a8 [ 28.219436] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 28.227646] [] ? load_image_and_restore+0xf9/0xf9 [ 28.234112] [] ? debug_object_deactivate+0x3c0/0x3c0 [ 28.240836] [] ? __warn+0x1a9/0x1e0 [ 28.246085] [] ? inet_sock_destruct+0x5f6/0x7b0 [ 28.252376] [] __warn+0x1c4/0x1e0 [ 28.257457] [] warn_slowpath_null+0x2c/0x40 [ 28.263401] [] inet_sock_destruct+0x5f6/0x7b0 [ 28.269519] [] ? ipv4_mib_init_net+0x560/0x560 [ 28.275724] [] l2tp_tunnel_destruct+0x352/0x5a0 [ 28.282013] [] ? l2tp_tunnel_destruct+0x1aa/0x5a0 [ 28.288473] [] ? l2tp_tunnel_del_work+0x460/0x460 [ 28.294934] [] __sk_destruct+0x53/0x570 [ 28.300528] [] rcu_process_callbacks+0x898/0x1300 [ 28.306988] [] ? rcu_process_callbacks+0x977/0x1300 [ 28.313623] [] ? __sk_dst_check+0x240/0x240 [ 28.319581] [] __do_softirq+0x206/0x951 [ 28.325178] [] irq_exit+0x165/0x190 [ 28.330439] [] smp_apic_timer_interrupt+0x7b/0xa0 [ 28.336902] [] apic_timer_interrupt+0xa0/0xb0 [ 28.343013] [ 28.345050] [] ? native_safe_halt+0x6/0x10 [ 28.350922] [] default_idle+0x55/0x360 [ 28.356431] [] arch_cpu_idle+0xa/0x10 [ 28.361852] [] default_idle_call+0x36/0x60 [ 28.367707] [] cpu_startup_entry+0x2b0/0x380 [ 28.373739] [] ? cpu_in_idle+0x20/0x20 [ 28.379250] [] rest_init+0x184/0x190 [ 28.384586] [] start_kernel+0x688/0x6bd [ 28.390182] [] ? thread_stack_cache_init+0xb/0xb [ 28.396558] [] ? early_idt_handler_array+0x120/0x120 [ 28.403283] [] x86_64_start_reservations+0x2a/0x2c [ 28.409833] [] x86_64_start_kernel+0x140/0x163 [ 28.416526] Dumping ftrace buffer: [ 28.420069] (ftrace buffer empty) [ 28.423751] Kernel Offset: disabled [ 28.427357] Rebooting in 86400 seconds..