[....] Starting enhanced syslogd: rsyslogd[ 13.720709] audit: type=1400 audit(1539456220.904:4): 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[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 '10.128.0.115' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 36.312351] kasan: CONFIG_KASAN_INLINE enabled [ 36.316770] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 36.329640] Modules linked in: [ 36.332924] CPU: 1 PID: 2082 Comm: syz-executor574 Not tainted 4.4.161+ #110 [ 36.340082] task: ffff8800b7dc17c0 task.stack: ffff8800b6fc0000 [ 36.346113] RIP: 0010:[] [] udp_queue_rcv_skb+0x18f/0x1530 [ 36.355051] RSP: 0018:ffff8800b6fc7970 EFLAGS: 00010206 [ 36.360471] RAX: dffffc0000000000 RBX: ffff8800b6400000 RCX: 0000000000000000 [ 36.367715] RDX: 000000000000000c RSI: ffffffff8246e746 RDI: 0000000000000060 [ 36.375046] RBP: ffff8800b6fc79b0 R08: 0000000000000001 R09: 0000000000000001 [ 36.382298] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8801d44e3a00 [ 36.389558] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8801d44e3a58 [ 36.396805] FS: 0000000002033880(0063) GS:ffff8801db700000(0000) knlGS:0000000000000000 [ 36.405005] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.410859] CR2: 0000000020000000 CR3: 00000000ba321000 CR4: 00000000001606b0 [ 36.418104] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.425365] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.432605] Stack: [ 36.434728] ffff8800b6400088 ffff880100000001 ffff8800b6400088 ffff8800b6400000 [ 36.442727] ffff8801d44e3a00 dffffc0000000000 ffff8801d44e3a58 0000000000000000 [ 36.450738] ffff8800b6fc7a20 ffffffff821d116b ffff8800b6400430 ffff8800b6400188 [ 36.458783] Call Trace: [ 36.461347] [] release_sock+0x17b/0x500 [ 36.466950] [] udp_sendmsg+0x1152/0x1c70 [ 36.472635] [] ? avc_has_perm_noaudit+0x2f0/0x2f0 [ 36.479122] [] ? udp_lib_close+0x20/0x20 [ 36.484808] [] ? udp_lib_unhash+0x630/0x630 [ 36.490754] [] ? trace_hardirqs_on+0x10/0x10 [ 36.496786] [] ? sock_has_perm+0x1c1/0x3f0 [ 36.502645] [] ? sock_has_perm+0x2a1/0x3f0 [ 36.508504] [] ? sock_has_perm+0x9f/0x3f0 [ 36.514276] [] ? selinux_msg_queue_alloc_security+0x2e0/0x2e0 [ 36.521786] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 36.528513] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 36.535241] [] ? check_preemption_disabled+0x3b/0x170 [ 36.542070] [] ? inet_sendmsg+0x143/0x4d0 [ 36.547858] [] inet_sendmsg+0x203/0x4d0 [ 36.553460] [] ? inet_sendmsg+0x73/0x4d0 [ 36.559144] [] ? inet_recvmsg+0x4c0/0x4c0 [ 36.564936] [] sock_sendmsg+0xbb/0x110 [ 36.570453] [] SyS_sendto+0x220/0x370 [ 36.575886] [] ? SyS_getpeername+0x2d0/0x2d0 [ 36.581929] [] ? mntput_no_expire+0xcc/0x820 [ 36.587966] [] ? __sock_release+0x260/0x260 [ 36.593911] [] ? mntput_no_expire+0xf8/0x820 [ 36.599962] [] ? dput.part.9+0x2a/0x760 [ 36.605561] [] ? __sock_release+0x260/0x260 [ 36.611524] [] ? task_work_run+0x152/0x190 [ 36.617387] [] ? int_ret_from_sys_call+0x52/0xa3 [ 36.623768] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 36.630582] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 36.637050] [] entry_SYSCALL_64_fastpath+0x1e/0x9a [ 36.643600] Code: 74 24 58 41 f6 c6 01 0f 85 39 08 00 00 e8 ba 87 e9 fe 49 83 e6 fe 48 b8 00 00 00 00 00 fc ff df 49 8d 7e 60 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 01 0f 8e d1 0e 00 00 41 f6 46 60 04 [ 36.670547] RIP [] udp_queue_rcv_skb+0x18f/0x1530 [ 36.677135] RSP [ 36.680793] ---[ end trace 238aac8416f3fcef ]--- [ 36.685572] Kernel panic - not syncing: Fatal exception in interrupt [ 36.692392] Kernel Offset: disabled [ 36.695998] Rebooting in 86400 seconds..