[....] Starting enhanced syslogd: rsyslogd[ 14.461354] audit: type=1400 audit(1573208680.234:4): 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 '10.128.0.176' (ECDSA) to the list of known hosts. 2019/11/08 10:24:48 parsed 1 programs 2019/11/08 10:24:49 executed programs: 0 syzkaller login: [ 24.820931] ------------[ cut here ]------------ [ 24.825730] WARNING: CPU: 1 PID: 2253 at lib/debugobjects.c:260 debug_print_object+0x181/0x210() [ 24.834632] ODEBUG: activate active (active state 1) object type: rcu_head hint: (null) [ 24.843907] Kernel panic - not syncing: panic_on_warn set ... [ 24.843907] [ 24.851267] CPU: 1 PID: 2253 Comm: syz-executor.0 Not tainted 4.4.174+ #4 [ 24.858180] 0000000000000000 17b9571e87229455 ffff8801db707298 ffffffff81aad1a1 [ 24.866209] ffff8801db7073e8 ffffffff82835ee0 ffffffff8292c440 0000000000000104 [ 24.874226] ffffffff81b0b3d1 ffff8801db707378 ffffffff813a48c2 0000000041b58ab3 [ 24.882239] Call Trace: [ 24.884796] [] dump_stack+0xc1/0x120 [ 24.890896] [] ? debug_print_object+0x181/0x210 [ 24.897197] [] panic+0x1b9/0x37b [ 24.902194] [] ? add_taint.cold+0x16/0x16 [ 24.907984] [] ? vprintk_emit+0x248/0x820 [ 24.913771] [] ? warn_slowpath_common.cold+0x5/0x20 [ 24.920433] [] warn_slowpath_common.cold+0x20/0x20 [ 24.927066] [] warn_slowpath_fmt+0xbf/0x100 [ 24.933033] [] ? warn_slowpath_common+0x120/0x120 [ 24.939509] [] debug_print_object+0x181/0x210 [ 24.945631] [] debug_object_activate+0x2f0/0x470 [ 24.952018] [] ? debug_object_free+0x350/0x350 [ 24.958246] [] ? debug_object_init_on_stack+0x20/0x20 [ 24.965066] [] ? xfrm_policy_alloc+0x480/0x480 [ 24.971294] [] __call_rcu.constprop.0+0x35/0x930 [ 24.977688] [] call_rcu+0x12/0x20 [ 24.982772] [] xfrm_policy_destroy+0x77/0x90 [ 24.988808] [] __xfrm_policy_check+0x137a/0x1640 [ 24.995204] [] ? __xfrm_policy_check+0x125/0x1640 [ 25.001674] [] ? __xfrm_route_forward+0x460/0x460 [ 25.008167] [] ? __lock_acquire+0xa4f/0x4f50 [ 25.014218] [] udp_queue_rcv_skb+0x8cb/0x14e0 [ 25.020353] [] __udp4_lib_rcv+0x4e3/0x21f0 [ 25.026219] [] udp_rcv+0x22/0x30 [ 25.031216] [] ip_local_deliver_finish+0x3c0/0xa70 [ 25.037835] [] ? ip_local_deliver_finish+0x12a/0xa70 [ 25.044748] [] ip_local_deliver+0x1af/0x390 [ 25.050715] [] ? ip_call_ra_chain+0x540/0x540 [ 25.058143] [] ? inet_del_offload+0x40/0x40 [ 25.064150] [] ? check_preemption_disabled+0x3c/0x200 [ 25.070976] [] ip_rcv_finish+0x768/0x1220 [ 25.076753] [] ? sk_clone_lock+0x1050/0x1050 [ 25.082857] [] ip_rcv+0x8fa/0xe70 [ 25.087942] [] ? ip_local_deliver+0x390/0x390 [ 25.094066] [] ? ip_local_deliver_finish+0xa70/0xa70 [ 25.100805] [] ? ip_local_deliver+0x390/0x390 [ 25.106946] [] __netif_receive_skb_core+0x1300/0x2950 [ 25.113766] [] ? dev_loopback_xmit+0x430/0x430 [ 25.119998] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 25.126728] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 25.133460] [] ? check_preemption_disabled+0x3c/0x200 [ 25.140277] [] __netif_receive_skb+0x58/0x1c0 [ 25.146588] [] process_backlog+0x200/0x630 [ 25.152455] [] ? process_backlog+0x19c/0x630 [ 25.158504] [] ? clockevents_program_event+0x182/0x3f0 [ 25.165425] [] ? net_rx_action+0x1fb/0xd30 [ 25.171299] [] net_rx_action+0x367/0xd30 [ 25.176995] [] ? net_rps_action_and_irq_enable.isra.0+0x170/0x170 [ 25.184862] [] __do_softirq+0x226/0xa3f [ 25.190467] [] do_softirq_own_stack+0x1c/0x30 [ 25.196587] [] do_softirq.part.0+0x54/0x60 [ 25.203199] [] do_softirq+0x18/0x20 [ 25.208461] [] netif_rx_ni+0xeb/0x3b0 [ 25.213897] [] tun_get_user+0xdbf/0x2640 [ 25.219598] [] ? tun_free_netdev+0xb0/0xb0 [ 25.225462] [] ? futex_wait+0x47d/0x600 [ 25.231079] [] ? irq_cpu_online+0x1a0/0x230 [ 25.237029] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 25.246635] [] ? __tun_get+0x126/0x230 [ 25.252155] [] tun_chr_write_iter+0xda/0x190 [ 25.258197] [] do_iter_readv_writev+0x141/0x1e0 [ 25.264496] [] ? tun_sendmsg+0x140/0x140 [ 25.270184] [] ? vfs_iter_read+0x280/0x280 [ 25.276050] [] ? rw_verify_area+0x103/0x2f0 [ 25.282000] [] ? tun_sendmsg+0x140/0x140 [ 25.287689] [] do_readv_writev+0x387/0x6e0 [ 25.293738] [] ? vfs_write+0x4e0/0x4e0 [ 25.299276] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 25.306025] [] ? check_preemption_disabled+0x3c/0x200 [ 25.312869] [] ? check_preemption_disabled+0x3c/0x200 [ 25.319827] [] ? __fget+0x13b/0x370 [ 25.325087] [] ? __fget+0x162/0x370 [ 25.330345] [] ? __fget+0x47/0x370 [ 25.335517] [] vfs_writev+0x7d/0xb0 [ 25.340773] [] SyS_writev+0xdc/0x260 [ 25.346117] [] ? SyS_readv+0x260/0x260 [ 25.351637] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 25.358138] [] entry_SYSCALL_64_fastpath+0x1e/0x9a [ 25.365240] Kernel Offset: disabled [ 25.369149] Rebooting in 86400 seconds..