[....] Starting enhanced syslogd: rsyslogd[ 14.073826] audit: type=1400 audit(1541713937.182:4): avc: denied { syslog } for pid=1922 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[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?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 '10.128.0.72' (ECDSA) to the list of known hosts. 2018/11/08 21:53:18 parsed 1 programs 2018/11/08 21:53:21 executed programs: 0 2018/11/08 21:53:26 executed programs: 260 syzkaller login: [ 83.584793] ------------[ cut here ]------------ [ 83.589623] WARNING: CPU: 1 PID: 3677 at lib/debugobjects.c:263 debug_print_object+0x181/0x210() [ 83.598539] ODEBUG: activate active (active state 1) object type: rcu_head hint: (null) [ 83.607593] Kernel panic - not syncing: panic_on_warn set ... [ 83.607593] [ 83.614949] CPU: 1 PID: 3677 Comm: syz-executor0 Not tainted 4.4.162+ #119 [ 83.621953] 0000000000000000 86a9890b261a2234 ffff8801db707278 ffffffff81aa526d [ 83.629975] ffffffff828354e0 ffff8801d5578000 ffffffff8292a6c0 0000000000000009 [ 83.637996] 0000000000000107 ffff8801db707338 ffffffff813a0e94 0000000041b58ab3 [ 83.646030] Call Trace: [ 83.648614] [] dump_stack+0xc1/0x124 [ 83.654698] [] panic+0x19e/0x359 [ 83.659699] [] ? add_taint.cold.4+0x16/0x16 [ 83.665648] [] ? warn_slowpath_common.cold.6+0x5/0x20 [ 83.672479] [] warn_slowpath_common.cold.6+0x20/0x20 [ 83.679223] [] ? debug_print_object+0x181/0x210 [ 83.685530] [] warn_slowpath_fmt+0xbf/0x100 [ 83.691508] [] ? warn_slowpath_common+0x120/0x120 [ 83.697999] [] debug_print_object+0x181/0x210 [ 83.704118] [] debug_object_activate+0x31a/0x480 [ 83.710503] [] ? debug_object_init_on_stack+0x20/0x20 [ 83.717322] [] ? xfrm_policy_alloc+0x450/0x450 [ 83.723534] [] __call_rcu.constprop.59+0x35/0x930 [ 83.730004] [] call_rcu+0x12/0x20 [ 83.735097] [] xfrm_policy_destroy+0x77/0x90 [ 83.741131] [] __xfrm_policy_check+0xce9/0x1780 [ 83.747426] [] ? __xfrm_policy_check+0x125/0x1780 [ 83.753911] [] ? __xfrm_route_forward+0x400/0x400 [ 83.760383] [] ? __lock_acquire+0xa85/0x5f10 [ 83.766425] [] ? trace_hardirqs_on+0x10/0x10 [ 83.772471] [] udp_queue_rcv_skb+0x8cd/0x1530 [ 83.778593] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 83.785321] [] __udp4_lib_rcv+0x4df/0x23b0 [ 83.791216] [] udp_rcv+0x21/0x30 [ 83.796239] [] ip_local_deliver_finish+0x3c0/0xa70 [ 83.802794] [] ? ip_local_deliver_finish+0x12a/0xa70 [ 83.809541] [] ip_local_deliver+0x1ac/0x390 [ 83.815490] [] ? ip_call_ra_chain+0x540/0x540 [ 83.821611] [] ? inet_del_offload+0x40/0x40 [ 83.827563] [] ? check_preemption_disabled+0x3b/0x170 [ 83.834388] [] ip_rcv_finish+0x759/0x1220 [ 83.840176] [] ? sk_clone_lock+0xfd0/0xfd0 [ 83.846036] [] ip_rcv+0x899/0xfc0 [ 83.851115] [] ? ip_local_deliver+0x390/0x390 [ 83.857256] [] ? ip_local_deliver_finish+0xa70/0xa70 [ 83.863984] [] ? ip_local_deliver+0x390/0x390 [ 83.870114] [] __netif_receive_skb_core+0x12c8/0x2820 [ 83.876939] [] ? dev_loopback_xmit+0x420/0x420 [ 83.883146] [] ? __do_softirq+0x22c/0xa1a [ 83.888923] [] ? smp_apic_timer_interrupt+0x81/0xa0 [ 83.895564] [] ? apic_timer_interrupt+0x9d/0xb0 [ 83.901893] [] ? kernfs_dop_revalidate+0x92/0x330 [ 83.908443] [] ? lookup_fast+0x57d/0xe60 [ 83.914151] [] ? walk_component+0xf4/0xf70 [ 83.920011] [] ? link_path_walk+0x822/0x1630 [ 83.926062] [] ? path_openat+0x1a4/0x39a0 [ 83.931834] [] ? do_filp_open+0x197/0x270 [ 83.937606] [] ? do_sys_open+0x31c/0x610 [ 83.943293] [] ? SyS_open+0x2d/0x40 [ 83.948547] [] ? entry_SYSCALL_64_fastpath+0x1e/0x9a [ 83.955302] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 83.962043] [] __netif_receive_skb+0x5b/0x1c0 [ 83.968179] [] process_backlog+0x20a/0x670 [ 83.974065] [] ? process_backlog+0x1a6/0x670 [ 83.980100] [] net_rx_action+0x367/0xd50 [ 83.985788] [] ? net_rps_action_and_irq_enable.isra.29+0x170/0x170 [ 83.993752] [] ? check_preemption_disabled+0x3b/0x170 [ 84.000568] [] __do_softirq+0x22c/0xa1a [ 84.006168] [] do_softirq_own_stack+0x1c/0x30 [ 84.012283] [] do_softirq.part.2+0x54/0x60 [ 84.018883] [] do_softirq+0x19/0x20 [ 84.024135] [] netif_rx_ni+0xec/0x3a0 [ 84.029572] [] tun_get_user+0xf3a/0x2690 [ 84.035261] [] ? tun_free_netdev+0xb0/0xb0 [ 84.041128] [] ? trace_hardirqs_on+0x10/0x10 [ 84.047166] [] ? futex_wait_setup+0x330/0x330 [ 84.053288] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 84.060018] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 84.066751] [] ? check_preemption_disabled+0x3b/0x170 [ 84.073582] [] tun_chr_write_iter+0xd5/0x190 [ 84.079616] [] do_iter_readv_writev+0x133/0x1d0 [ 84.086135] [] ? tun_sendmsg+0x140/0x140 [ 84.091821] [] ? vfs_iter_read+0x270/0x270 [ 84.097698] [] ? rw_verify_area+0x100/0x2f0 [ 84.103664] [] ? tun_sendmsg+0x140/0x140 [ 84.109371] [] do_readv_writev+0x335/0x6f0 [ 84.115235] [] ? vfs_write+0x4e0/0x4e0 [ 84.120759] [] ? check_preemption_disabled+0x3b/0x170 [ 84.127579] [] ? __fget+0x12f/0x3d0 [ 84.132844] [] ? __fget+0x156/0x3d0 [ 84.138097] [] ? __fget+0x47/0x3d0 [ 84.143265] [] vfs_writev+0x7b/0xb0 [ 84.148528] [] SyS_writev+0xd9/0x250 [ 84.153873] [] ? SyS_readv+0x250/0x250 [ 84.159397] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 84.165866] [] entry_SYSCALL_64_fastpath+0x1e/0x9a [ 84.172721] Kernel Offset: disabled [ 84.176646] Rebooting in 86400 seconds..