[....] Starting enhanced syslogd: rsyslogd[ 14.829059] audit: type=1400 audit(1561816565.693:4): avc: denied { syslog } for pid=1925 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 '10.128.0.83' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 44.355469] BUG: using __this_cpu_add() in preemptible [00000000] code: syz-executor704/2083 [ 44.364863] caller is __this_cpu_preempt_check+0x1d/0x30 [ 44.370577] CPU: 0 PID: 2083 Comm: syz-executor704 Not tainted 4.4.174+ #4 [ 44.377680] 0000000000000000 ddaa5b615525a932 ffff8801d42bf778 ffffffff81aad1a1 [ 44.385976] ffff8800b8265f00 0000000000000000 ffffffff82a861e0 ffffffff8292c040 [ 44.394091] 0000000000000002 ffff8801d42bf7b8 ffffffff81b0ad83 ffff8801d49c6a00 [ 44.402615] Call Trace: [ 44.405189] [] dump_stack+0xc1/0x120 [ 44.411126] [] check_preemption_disabled+0x1d3/0x200 [ 44.418688] [] __this_cpu_preempt_check+0x1d/0x30 [ 44.425691] [] tcp_try_coalesce+0x245/0x510 [ 44.432031] [] ? tcp_prune_ofo_queue.part.0+0x460/0x460 [ 44.439266] [] ? skb_copy_datagram_from_iter+0x32b/0x5c0 [ 44.447048] [] tcp_queue_rcv+0x127/0x6f0 [ 44.453221] [] tcp_send_rcvq+0x3de/0x4a0 [ 44.459633] [] ? tcp_rcv_established+0x2070/0x2070 [ 44.466999] [] ? trace_hardirqs_on_caller+0x385/0x5a0 [ 44.474036] [] ? lock_sock_nested+0x90/0x120 [ 44.480230] [] ? trace_hardirqs_on+0xd/0x10 [ 44.486383] [] ? __local_bh_enable_ip+0x6a/0xe0 [ 44.493338] [] tcp_sendmsg+0x2332/0x2ab0 [ 44.499153] [] ? trace_hardirqs_on+0x10/0x10 [ 44.505202] [] ? sock_has_perm+0x2a8/0x400 [ 44.511165] [] ? selinux_msg_queue_alloc_security+0x2e0/0x2e0 [ 44.519225] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 44.526003] [] ? tcp_sendpage+0x17c0/0x17c0 [ 44.532268] [] ? check_preemption_disabled+0x3c/0x200 [ 44.539395] [] ? check_preemption_disabled+0x3c/0x200 [ 44.546355] [] ? inet_sendmsg+0x143/0x4d0 [ 44.552479] [] inet_sendmsg+0x202/0x4d0 [ 44.559048] [] ? inet_sendmsg+0x76/0x4d0 [ 44.565074] [] ? inet_recvmsg+0x4d0/0x4d0 [ 44.571477] [] sock_sendmsg+0xbe/0x110 [ 44.577011] [] ___sys_sendmsg+0x769/0x890 [ 44.583326] [] ? __inc_zone_page_state+0x39/0x50 [ 44.589915] [] ? check_preemption_disabled+0x3c/0x200 [ 44.597317] [] ? copy_msghdr_from_user+0x550/0x550 [ 44.603884] [] ? filemap_map_pages+0x11b/0x960 [ 44.610114] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 44.617170] [] ? read_cache_page_gfp+0x90/0x90 [ 44.624085] [] ? handle_mm_fault+0x1b10/0x3140 [ 44.630607] [] ? _raw_spin_unlock+0x2d/0x50 [ 44.637238] [] ? handle_mm_fault+0x98d/0x3140 [ 44.643727] [] ? tcp_done+0x260/0x260 [ 44.650059] [] ? trace_hardirqs_on+0xd/0x10 [ 44.656702] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 44.663987] [] ? __fget_light+0xa3/0x1f0 [ 44.669899] [] ? __fdget+0x1b/0x20 [ 44.675366] [] __sys_sendmsg+0xc5/0x160 [ 44.680982] [] ? SyS_shutdown+0x1a0/0x1a0 [ 44.686831] [] ? retint_user+0x18/0x3c [ 44.692461] [] ? trace_hardirqs_on_caller+0x385/0x5a0 [ 44.699299] [] SyS_sendmsg+0x2d/0x50 [ 44.704880] [