[....] Starting enhanced syslogd: rsyslogd[ 13.557152] audit: type=1400 audit(1521026816.333:4): avc: denied { syslog } for pid=3655 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 '10.128.0.40' (ECDSA) to the list of known hosts. executing program executing program executing program syzkaller login: [ 27.267742] ------------[ cut here ]------------ [ 27.272512] WARNING: CPU: 0 PID: 0 at net/ipv4/af_inet.c:167 inet_sock_destruct+0x5f6/0x7b0 [ 27.280998] Kernel panic - not syncing: panic_on_warn set ... [ 27.280998] [ 27.288361] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.87-g97d7f1c #54 [ 27.295252] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.304574] ffff8801db207cb8 ffffffff81d95a19 ffffffff83a480c0 ffff8801db207d90 [ 27.312539] ffffffff83f2fb00 ffffffff832eedf6 0000000000000009 ffff8801db207d80 [ 27.320511] ffffffff8142f7e1 0000000041b58ab3 ffffffff8418b658 ffffffff8142f625 [ 27.328472] Call Trace: [ 27.331021] [ 27.333060] [] dump_stack+0xc1/0x128 [ 27.338409] [] ? inet_sock_destruct+0x5f6/0x7b0 [ 27.344696] [] panic+0x1bc/0x3a8 [ 27.349681] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 27.357879] [] ? load_image_and_restore+0xf9/0xf9 [ 27.364338] [] ? __warn+0x1a9/0x1e0 [ 27.369583] [] ? inet_sock_destruct+0x5f6/0x7b0 [ 27.375869] [] __warn+0x1c4/0x1e0 [ 27.380940] [] warn_slowpath_null+0x2c/0x40 [ 27.386881] [] inet_sock_destruct+0x5f6/0x7b0 [ 27.393004] [] ? trace_hardirqs_on+0xd/0x10 [ 27.398945] [] ? ipv4_mib_init_net+0x560/0x560 [ 27.405148] [] l2tp_tunnel_destruct+0x352/0x5a0 [ 27.411438] [] ? l2tp_tunnel_destruct+0x1aa/0x5a0 [ 27.417906] [] ? l2tp_tunnel_del_work+0x460/0x460 [ 27.424368] [] __sk_destruct+0x53/0x570 [ 27.429963] [] rcu_process_callbacks+0x898/0x1300 [ 27.436423] [] ? rcu_process_callbacks+0x977/0x1300 [ 27.443055] [] ? __sk_dst_check+0x240/0x240 [ 27.448996] [] __do_softirq+0x206/0x951 [ 27.454587] [] irq_exit+0x165/0x190 [ 27.459832] [] smp_apic_timer_interrupt+0x7b/0xa0 [ 27.466289] [] apic_timer_interrupt+0xa0/0xb0 [ 27.472400] [ 27.474438] [] ? native_safe_halt+0x6/0x10 [ 27.480305] [] default_idle+0x55/0x360 [ 27.485813] [] arch_cpu_idle+0xa/0x10 [ 27.491231] [] default_idle_call+0x36/0x60 [ 27.497087] [] cpu_startup_entry+0x2b0/0x380 [ 27.503121] [] ? cpu_in_idle+0x20/0x20 [ 27.508633] [] rest_init+0x184/0x190 [ 27.513970] [] start_kernel+0x688/0x6bd [ 27.519563] [] ? thread_stack_cache_init+0xb/0xb [ 27.525936] [] ? x86_family+0x32/0x40 [ 27.531358] [] ? early_idt_handler_array+0x120/0x120 [ 27.538078] [] x86_64_start_reservations+0x2a/0x2c [ 27.544624] [] x86_64_start_kernel+0x140/0x163 [ 27.551325] Dumping ftrace buffer: [ 27.554868] (ftrace buffer empty) [ 27.558544] Kernel Offset: disabled [ 27.562147] Rebooting in 86400 seconds..