[....] Starting enhanced syslogd: rsyslogd[ 12.388494] audit: type=1400 audit(1516399654.098:4): avc: denied { syslog } for pid=3174 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 '10.128.15.220' (ECDSA) to the list of known hosts. executing program executing program executing program syzkaller login: [ 20.399273] ------------[ cut here ]------------ [ 20.404048] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x5f6/0x7b0 [ 20.412527] Kernel panic - not syncing: panic_on_warn set ... [ 20.412527] [ 20.419873] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.77-g9c3804b #17 [ 20.426767] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.436090] ffff8801db207cb8 ffffffff81d941c9 ffffffff83a47bc0 ffff8801db207d90 [ 20.444066] ffffffff83f2f000 ffffffff832ebc36 0000000000000009 ffff8801db207d80 [ 20.452034] ffffffff8142f3c1 0000000041b58ab3 ffffffff8418ab70 ffffffff8142f205 [ 20.460001] Call Trace: [ 20.462554] [ 20.464589] [] dump_stack+0xc1/0x128 [ 20.469946] [] ? inet_sock_destruct+0x5f6/0x7b0 [ 20.476243] [] panic+0x1bc/0x3a8 [ 20.481227] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 20.489423] [] ? load_image_and_restore+0xf9/0xf9 [ 20.495883] [] ? __warn+0x1a9/0x1e0 [ 20.501131] [] ? inet_sock_destruct+0x5f6/0x7b0 [ 20.507417] [] __warn+0x1c4/0x1e0 [ 20.512487] [] warn_slowpath_null+0x2c/0x40 [ 20.518426] [] inet_sock_destruct+0x5f6/0x7b0 [ 20.524549] [] ? trace_hardirqs_on+0xd/0x10 [ 20.530489] [] ? ipv4_mib_init_net+0x560/0x560 [ 20.536688] [] l2tp_tunnel_destruct+0x352/0x5a0 [ 20.542976] [] ? l2tp_tunnel_destruct+0x1aa/0x5a0 [ 20.549434] [] ? l2tp_tunnel_del_work+0x460/0x460 [ 20.555902] [] __sk_destruct+0x53/0x570 [ 20.561500] [] rcu_process_callbacks+0x898/0x1300 [ 20.567961] [] ? rcu_process_callbacks+0x977/0x1300 [ 20.574599] [] ? __sk_dst_check+0x240/0x240 [ 20.580543] [] __do_softirq+0x206/0x951 [ 20.586135] [] irq_exit+0x165/0x190 [ 20.591385] [] smp_apic_timer_interrupt+0x7b/0xa0 [ 20.597850] [] apic_timer_interrupt+0xa0/0xb0 [ 20.603958] [ 20.605993] [] ? native_safe_halt+0x6/0x10 [ 20.611861] [] default_idle+0x55/0x360 [ 20.617368] [] arch_cpu_idle+0xa/0x10 [ 20.622789] [] default_idle_call+0x36/0x60 [ 20.628650] [] cpu_startup_entry+0x2b0/0x380 [ 20.634675] [] ? cpu_in_idle+0x20/0x20 [ 20.640181] [] rest_init+0x184/0x190 [ 20.645512] [] start_kernel+0x688/0x6bd [ 20.651104] [] ? thread_stack_cache_init+0xb/0xb [ 20.657476] [] ? early_idt_handler_array+0x120/0x120 [ 20.664196] [] x86_64_start_reservations+0x2a/0x2c [ 20.670743] [] x86_64_start_kernel+0x140/0x163 [ 20.677443] Dumping ftrace buffer: [ 20.680982] (ftrace buffer empty) [ 20.684660] Kernel Offset: disabled [ 20.688259] Rebooting in 86400 seconds..