[....] Starting enhanced syslogd: rsyslogd[   15.936191] audit: type=1400 audit(1561946870.017:4): 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 '10.128.0.247' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   39.005391] BUG: using __this_cpu_add() in preemptible [00000000] code: syz-executor066/2080
[   39.014109] caller is __this_cpu_preempt_check+0x1d/0x30
[   39.019569] CPU: 0 PID: 2080 Comm: syz-executor066 Not tainted 4.4.174+ #17
[   39.026685]  0000000000000000 d4fa7c433b3ad3ea ffff8800b284f750 ffffffff81aad1a1
[   39.034703]  ffff8800b82a17c0 0000000000000000 ffffffff82a861e0 ffffffff8292c040
[   39.042705]  0000000000000002 ffff8800b284f790 ffffffff81b0ad83 ffff8800b6d54500
[   39.050726] Call Trace:
[   39.053299]  [<ffffffff81aad1a1>] dump_stack+0xc1/0x120
[   39.058652]  [<ffffffff81b0ad83>] check_preemption_disabled+0x1d3/0x200
[   39.065389]  [<ffffffff81b0aded>] __this_cpu_preempt_check+0x1d/0x30
[   39.071867]  [<ffffffff8240fcf5>] tcp_try_coalesce+0x245/0x510
[   39.077832]  [<ffffffff8240fab0>] ? tcp_prune_ofo_queue.part.0+0x460/0x460
[   39.084861]  [<ffffffff8220deab>] ? skb_copy_datagram_from_iter+0x32b/0x5c0
[   39.091989]  [<ffffffff824100e7>] tcp_queue_rcv+0x127/0x6f0
[   39.097692]  [<ffffffff8242494e>] tcp_send_rcvq+0x3de/0x4a0
[   39.103411]  [<ffffffff82424570>] ? tcp_rcv_established+0x2070/0x2070
[   39.109988]  [<ffffffff811ff385>] ? trace_hardirqs_on_caller+0x385/0x5a0
[   39.116819]  [<ffffffff821e4ed0>] ? lock_sock_nested+0x90/0x120
[   39.122892]  [<ffffffff811ff5ad>] ? trace_hardirqs_on+0xd/0x10
[   39.128852]  [<ffffffff810e17ba>] ? __local_bh_enable_ip+0x6a/0xe0
[   39.135177]  [<ffffffff823fd062>] tcp_sendmsg+0x2332/0x2ab0
[   39.140873]  [<ffffffff811ff5b0>] ? trace_hardirqs_on+0x10/0x10
[   39.146934]  [<ffffffff8195fd28>] ? sock_has_perm+0x2a8/0x400
[   39.152859]  [<ffffffff8195fa80>] ? selinux_msg_queue_alloc_security+0x2e0/0x2e0
[   39.160381]  [<ffffffff8123a761>] ? debug_lockdep_rcu_enabled+0x71/0xa0
[   39.167302]  [<ffffffff823fad30>] ? tcp_sendpage+0x17c0/0x17c0
[   39.173351]  [<ffffffff81b0abec>] ? check_preemption_disabled+0x3c/0x200
[   39.180178]  [<ffffffff81b0abec>] ? check_preemption_disabled+0x3c/0x200
[   39.187162]  [<ffffffff824a8a83>] ? inet_sendmsg+0x143/0x4d0
[   39.192961]  [<ffffffff824a8b42>] inet_sendmsg+0x202/0x4d0
[   39.198701]  [<ffffffff824a89b6>] ? inet_sendmsg+0x76/0x4d0
[   39.204416]  [<ffffffff824a8940>] ? inet_recvmsg+0x4d0/0x4d0
[   39.210292]  [<ffffffff821d838e>] sock_sendmsg+0xbe/0x110
[   39.215822]  [<ffffffff821d8615>] sock_write_iter+0x235/0x3d0
[   39.221721]  [<ffffffff821d83e0>] ? sock_sendmsg+0x110/0x110
[   39.227509]  [<ffffffff81ae7943>] ? iov_iter_init+0xb3/0x1e0
[   39.233466]  [<ffffffff81496ae8>] __vfs_write+0x2e8/0x3d0
[   39.238987]  [<ffffffff81496800>] ? __vfs_read+0x3c0/0x3c0
[   39.244598]  [<ffffffff81965e45>] ? selinux_file_permission+0x2f5/0x450
[   39.251341]  [<ffffffff81497f43>] ? rw_verify_area+0x103/