[....] Starting enhanced syslogd: rsyslogd[ 15.697381] audit: type=1400 audit(1561814422.789:4): avc: denied { syslog } for pid=1920 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 periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Starting mcstransd: [....] 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 '10.128.0.87' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 31.119058] BUG: using __this_cpu_add() in preemptible [00000000] code: syz-executor310/2072 [ 31.127899] caller is __this_cpu_preempt_check+0x1d/0x30 [ 31.133383] CPU: 0 PID: 2072 Comm: syz-executor310 Not tainted 4.4.174+ #17 [ 31.140484] 0000000000000000 7e2acb0d245a4e26 ffff8800b68176f8 ffffffff81aad1a1 [ 31.148563] ffff8800b7b92f80 0000000000000000 ffffffff82a861e0 ffffffff8292c040 [ 31.156675] 0000000000000002 ffff8800b6817738 ffffffff81b0ad83 ffff8801d5236780 [ 31.164695] Call Trace: [ 31.167284] [] dump_stack+0xc1/0x120 [ 31.172736] [] check_preemption_disabled+0x1d3/0x200 [ 31.179472] [] __this_cpu_preempt_check+0x1d/0x30 [ 31.186034] [] tcp_try_coalesce+0x245/0x510 [ 31.192089] [] ? tcp_prune_ofo_queue.part.0+0x460/0x460 [ 31.199106] [] ? skb_copy_datagram_from_iter+0x32b/0x5c0 [ 31.206196] [] tcp_queue_rcv+0x127/0x6f0 [ 31.211886] [] tcp_send_rcvq+0x3de/0x4a0 [ 31.217576] [] ? tcp_rcv_established+0x2070/0x2070 [ 31.224139] [] ? trace_hardirqs_on_caller+0x385/0x5a0 [ 31.230964] [] ? lock_sock_nested+0x90/0x120 [ 31.237000] [] ? trace_hardirqs_on+0xd/0x10 [ 31.242966] [] ? __local_bh_enable_ip+0x6a/0xe0 [ 31.249275] [] tcp_sendmsg+0x2332/0x2ab0 [ 31.254970] [] ? trace_hardirqs_on+0x10/0x10 [ 31.261026] [] ? sock_has_perm+0x2a8/0x400 [ 31.266948] [] ? selinux_msg_queue_alloc_security+0x2e0/0x2e0 [ 31.274594] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 31.281353] [] ? tcp_sendpage+0x17c0/0x17c0 [ 31.287313] [] ? check_preemption_disabled+0x3c/0x200 [ 31.294143] [] ? check_preemption_disabled+0x3c/0x200 [ 31.301001] [] ? inet_sendmsg+0x143/0x4d0 [ 31.306801] [] inet_sendmsg+0x202/0x4d0 [ 31.312522] [] ? inet_sendmsg+0x76/0x4d0 [ 31.318234] [] ? inet_recvmsg+0x4d0/0x4d0 [ 31.324017] [] sock_sendmsg+0xbe/0x110 [ 31.329638] [] ___sys_sendmsg+0x769/0x890 [ 31.335442] [] ? avc_has_perm+0xac/0x3a0 [ 31.341168] [] ? copy_msghdr_from_user+0x550/0x550 [ 31.347737] [] ? __local_bh_enable_ip+0x6a/0xe0 [ 31.354050] [] ? trace_hardirqs_on_caller+0x385/0x5a0 [ 31.360897] [] ? release_sock+0x3a8/0x500 [ 31.366685] [] ? trace_hardirqs_on+0xd/0x10 [ 31.372653] [] ? __local_bh_enable_ip+0x6a/0xe0 [ 31.379072] [] ? _raw_spin_unlock_bh+0x31/0x40 [ 31.385414] [] ? release_sock+0x3a8/0x500 [ 31.391197] [] ? trace_hardirqs_on+0xd/0x10 [ 31.397152] [] ? __local_bh_enable_ip+0x6a/0xe0 [ 31.403476] [] ? lock_sock_nested+0xdc/0x120 [ 31.409603] [] ? do_tcp_setsockopt.isra.0+0x121/0x19a0 [ 31.416538] [] ? tcp_done+0x260/0x260 [ 31.422067] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 31.428812] [] ? __fget_light+0xa3/0x1f0 [ 31.434535] [] ? __fdget+0x1b/0x20 [ 31.439717] [] ? sockfd_lookup_light+0xb4/0x160 [ 31.446042] [] __sys_sendmsg+0xc5/0x160 [ 31.451654] [] ? SyS_shutdown+0x1a0/0x1a0 [ 31.457443] [] ? do_tcp_setsockopt.isra.0+0x19a0/0x19a0 [ 31.464954] [] ? scm_detach_fds_compat+0x3b