[....] Starting enhanced syslogd: rsyslogd[ 13.230934] audit: type=1400 audit(1536403893.338:4): avc: denied { syslog } for pid=1918 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 '10.128.0.24' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 45.370993] kasan: CONFIG_KASAN_INLINE enabled [ 45.375438] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 45.388283] Dumping ftrace buffer: [ 45.391808] (ftrace buffer empty) [ 45.395508] Modules linked in: [ 45.398800] CPU: 0 PID: 2082 Comm: syz-executor284 Not tainted 4.4.154+ #97 [ 45.405975] task: ffff8801d4ab5f00 task.stack: ffff8801d43e0000 [ 45.412010] RIP: 0010:[] [] udpv6_queue_rcv_skb+0x18f/0x1510 [ 45.421130] RSP: 0018:ffff8801d43e78d0 EFLAGS: 00010206 [ 45.426556] RAX: dffffc0000000000 RBX: ffff8800b68f8000 RCX: 0000000000000000 [ 45.433805] RDX: 000000000000000c RSI: ffffffff8258f106 RDI: 0000000000000060 [ 45.441198] RBP: ffff8801d43e7910 R08: 0000000000000001 R09: 0000000000000001 [ 45.448446] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8800b7056c80 [ 45.455756] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8800b7056cd8 [ 45.463047] FS: 00000000008e4880(0063) GS:ffff8801db600000(0000) knlGS:0000000000000000 [ 45.471261] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 45.477309] CR2: 0000000020000080 CR3: 00000000ba3a1000 CR4: 00000000001606b0 [ 45.484577] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 45.491831] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 45.499082] Stack: [ 45.501246] 00000001b68f8088 ffff8800b7056c80 ffff8800b68f8088 ffff8800b68f8000 [ 45.509252] ffff8800b7056c80 dffffc0000000000 ffff8800b7056cd8 0000000000000000 [ 45.517251] ffff8801d43e7980 ffffffff821682bb ffff8800b68f8430 ffff8800b68f8188 [ 45.525239] Call Trace: [ 45.527806] [] release_sock+0x17b/0x500 [ 45.533412] [] udpv6_sendmsg+0x917/0x24c0 [ 45.539255] [] ? udp_lib_close+0x20/0x20 [ 45.544952] [] ? udp_v6_flush_pending_frames+0xe0/0xe0 [ 45.551880] [] ? avc_has_perm_noaudit+0x2f0/0x2f0 [ 45.558349] [] ? trace_hardirqs_on+0x10/0x10 [ 45.564382] [] ? sock_has_perm+0x1c1/0x3f0 [ 45.570248] [] ? sock_has_perm+0x2a1/0x3f0 [ 45.576154] [] ? sock_has_perm+0x9f/0x3f0 [ 45.581936] [] ? selinux_msg_queue_alloc_security+0x2e0/0x2e0 [ 45.589669] [] ? trace_hardirqs_on+0x10/0x10 [ 45.595810] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 45.602652] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 45.609423] [] ? check_preemption_disabled+0x3b/0x170 [ 45.616246] [] ? inet_sendmsg+0x143/0x4d0 [ 45.622062] [] inet_sendmsg+0x203/0x4d0 [ 45.627664] [] ? inet_sendmsg+0x73/0x4d0 [ 45.633353] [] ? inet_recvmsg+0x4c0/0x4c0 [ 45.639129] [] sock_sendmsg+0xbb/0x110 [ 45.644644] [] SyS_sendto+0x220/0x370 [ 45.650076] [] ? SyS_getpeername+0x2d0/0x2d0 [ 45.656117] [] ? inet6_bind+0x13b/0xf50 [ 45.661899] [] ? SyS_bind+0x18a/0x280 [ 45.667332] [] ? SyS_socketpair+0x520/0x520 [ 45.673292] [] ? retint_user+0x18/0x3c [ 45.678809] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 45.685632] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 45.692104] [] entry_SYSCALL_64_fastpath+0x1e/0x9a [ 45.698654] Code: 74 24 58 41 f6 c6 01 0f 85 24 08 00 00 e8 da 57 d6 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 d0 0e 00 00 41 f6 46 60 04 [ 45.725764] RIP [] udpv6_queue_rcv_skb+0x18f/0x1510 [ 45.732537] RSP [ 45.736187] ---[ end trace 90a580bc89e92f77 ]--- [ 45.740932] Kernel panic - not syncing: Fatal exception in interrupt [ 45.747750] Dumping ftrace buffer: [ 45.751272] (ftrace buffer empty) [ 45.754962] Kernel Offset: disabled [ 45.758566] Rebooting in 86400 seconds..