[....] Starting enhanced syslogd: rsyslogd[ 13.747553] audit: type=1400 audit(1561945550.725:4): avc: denied { syslog } for pid=1918 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] 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 '10.128.1.51' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 50.357158] BUG: using __this_cpu_add() in preemptible [00000000] code: syz-executor092/2082 [ 50.365889] caller is __this_cpu_preempt_check+0x1d/0x30 [ 50.371380] CPU: 0 PID: 2082 Comm: syz-executor092 Not tainted 4.4.174+ #4 [ 50.378371] 0000000000000000 ccb6b4fb72623194 ffff8800b6a777c8 ffffffff81aad1a1 [ 50.386377] ffff8801d4ec17c0 0000000000000000 ffffffff82a861e0 ffffffff8292c040 [ 50.394371] 0000000000000002 ffff8800b6a77808 ffffffff81b0ad83 ffff8800b68c5b80 [ 50.402474] Call Trace: [ 50.405048] [] dump_stack+0xc1/0x120 [ 50.410455] [] check_preemption_disabled+0x1d3/0x200 [ 50.417205] [] __this_cpu_preempt_check+0x1d/0x30 [ 50.423689] [] tcp_try_coalesce+0x245/0x510 [ 50.429641] [] ? tcp_prune_ofo_queue.part.0+0x460/0x460 [ 50.436636] [] ? skb_copy_datagram_from_iter+0x32b/0x5c0 [ 50.443713] [] tcp_queue_rcv+0x127/0x6f0 [ 50.449399] [] tcp_send_rcvq+0x3de/0x4a0 [ 50.455084] [] ? tcp_rcv_established+0x2070/0x2070 [ 50.461640] [] ? trace_hardirqs_on_caller+0x385/0x5a0 [ 50.468534] [] ? lock_sock_nested+0x90/0x120 [ 50.474586] [] ? trace_hardirqs_on+0xd/0x10 [ 50.480668] [] ? __local_bh_enable_ip+0x6a/0xe0 [ 50.486987] [] tcp_sendmsg+0x2332/0x2ab0 [ 50.492701] [] ? trace_hardirqs_on+0x10/0x10 [ 50.498750] [] ? sock_has_perm+0x2a8/0x400 [ 50.504616] [] ? selinux_msg_queue_alloc_security+0x2e0/0x2e0 [ 50.512144] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 50.518893] [] ? tcp_sendpage+0x17c0/0x17c0 [ 50.524854] [] ? check_preemption_disabled+0x3c/0x200 [ 50.531678] [] ? check_preemption_disabled+0x3c/0x200 [ 50.538502] [] ? inet_sendmsg+0x143/0x4d0 [ 50.544281] [] inet_sendmsg+0x202/0x4d0 [ 50.549883] [] ? inet_sendmsg+0x76/0x4d0 [ 50.555572] [] ? inet_recvmsg+0x4d0/0x4d0 [ 50.561349] [] sock_sendmsg+0xbe/0x110 [ 50.566859] [] sock_write_iter+0x235/0x3d0 [ 50.572883] [] ? sock_sendmsg+0x110/0x110 [ 50.578661] [] ? iov_iter_init+0xb3/0x1e0 [ 50.584435] [] __vfs_write+0x2e8/0x3d0 [ 50.589945] [] ? __vfs_read+0x3c0/0x3c0 [ 50.595552] [] ? selinux_file_permission+0x2f5/0x450 [ 50.602293] [] ? rw_verify_area+0x103/0x2f0 [