[....] Starting enhanced syslogd: rsyslogd[ 14.343449] audit: type=1400 audit(1552044613.340:4): avc: denied { syslog } for pid=1915 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] 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 '10.128.15.218' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 37.391703] BUG: using __this_cpu_add() in preemptible [00000000] code: syz-executor979/2073 [ 37.400594] caller is __this_cpu_preempt_check+0x1d/0x30 [ 37.407333] CPU: 0 PID: 2073 Comm: syz-executor979 Not tainted 4.4.174+ #17 [ 37.414461] 0000000000000000 5eb4a794ad8b9564 ffff8801d86576f8 ffffffff81aad1a1 [ 37.422626] ffff8800b78497c0 0000000000000000 ffffffff82a861e0 ffffffff8292c040 [ 37.430629] 0000000000000002 ffff8801d8657738 ffffffff81b0ad83 ffff8800b69b5400 [ 37.438652] Call Trace: [ 37.441224] [] dump_stack+0xc1/0x120 [ 37.446640] [] check_preemption_disabled+0x1d3/0x200 [ 37.453397] [] __this_cpu_preempt_check+0x1d/0x30 [ 37.459999] [] tcp_try_coalesce+0x245/0x510 [ 37.465955] [] ? tcp_prune_ofo_queue.part.0+0x460/0x460 [ 37.473063] [] ? skb_copy_datagram_from_iter+0x32b/0x5c0 [ 37.480209] [] tcp_queue_rcv+0x127/0x6f0 [ 37.485922] [] tcp_send_rcvq+0x3de/0x4a0 [ 37.491615] [] ? tcp_rcv_established+0x2070/0x2070 [ 37.498187] [] ? trace_hardirqs_on_caller+0x385/0x5a0 [ 37.505085] [] ? lock_sock_nested+0x90/0x120 [ 37.511222] [] ? trace_hardirqs_on+0xd/0x10 [ 37.517189] [] ? __local_bh_enable_ip+0x6a/0xe0 [ 37.523672] [] tcp_sendmsg+0x2332/0x2ab0 [ 37.529365] [] ? trace_hardirqs_on+0x10/0x10 [ 37.535473] [] ? sock_has_perm+0x2a8/0x400 [ 37.541359] [] ? selinux_msg_queue_alloc_security+0x2e0/0x2e0 [ 37.548881] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 37.556273] [] ? tcp_sendpage+0x17c0/0x17c0 [ 37.562501] [] ? check_preemption_disabled+0x3c/0x200 [ 37.569326] [] ? check_preemption_disabled+0x3c/0x200 [ 37.576285] [] ? inet_sendmsg+0x143/0x4d0 [ 37.582066] [] inet_sendmsg+0x202/0x4d0 [ 37.587675] [] ? inet_sendmsg+0x76/0x4d0 [ 37.593470] [] ? inet_recvmsg+0x4d0/0x4d0 [ 37.599260] [] sock_sendmsg+0xbe/0x110 [ 37.604800] [] ___sys_sendmsg+0x769/0x890 [ 37.610594] [] ? avc_has_perm+0xac/0x3a0 [ 37.616300] [] ? copy_msghdr_from_user+0x550/0x550 [ 37.622872] [] ? __local_bh_enable_ip+0x6a/0xe0 [ 37.629244] [] ? trace_hardirqs_on_caller+0x385/0x5a0 [ 37.636086] [] ? release_sock+0x3a8/0x500 [ 37.641993] [] ? trace_hardirqs_on+0xd/0x10 [ 37.647957] [] ? __local_bh_enable_ip+0x6a/0xe0 [ 37.654259] [] ? _raw_spin_unlock_bh+0x31/0x40 [ 37.660483] [] ? release_sock+0x3a8/0x500 [ 37.666306] [] ? trace_hardirqs_on+0xd/0x10 [ 37.672282] [] ? __local_bh_enable_ip+0x6a/0xe0 [ 37.678697] [] ? lock_sock_nested+0xdc/0x120 [ 37.684808] [] ? do_tcp_setsockopt.isra.0+0x121/0x19a0 [ 37.691831] [] ? tcp_done+0x260/0x260 [ 37.697322] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 37.704073] [] ? __fget_light+0xa3/0x1f0 [ 37.709772] [] ? __fdget+0x1b/0x20 [ 37.714953] [] ? sockfd_lookup_light+0xb4/0x160 [ 37.721432] [] __sys_sendmsg+0xc5/0x160 [ 37.727043] [] ? SyS_shutdown+0x1a0/0x1a0 [ 37.732851] [] ? do_tcp_setsockopt.isra.0+0x19a0/0x19a0 [ 37.740108] []