[....] Starting enhanced syslogd: rsyslogd[ 14.160429] audit: type=1400 audit(1539468672.238:4): avc: denied { syslog } for pid=1917 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 periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] 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 '10.128.0.90' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 33.582156] kasan: CONFIG_KASAN_INLINE enabled [ 33.586744] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 33.599813] Modules linked in: [ 33.603139] CPU: 0 PID: 2069 Comm: syz-executor455 Not tainted 4.4.161+ #110 [ 33.610459] task: ffff8800b7e00000 task.stack: ffff8800b6d18000 [ 33.616639] RIP: 0010:[] [] udp_queue_rcv_skb+0x18f/0x1530 [ 33.625793] RSP: 0018:ffff8800b6d1f970 EFLAGS: 00010206 [ 33.631427] RAX: dffffc0000000000 RBX: ffff8801d4f50000 RCX: 0000000000000000 [ 33.638703] RDX: 000000000000000c RSI: ffffffff8246e746 RDI: 0000000000000060 [ 33.645959] RBP: ffff8800b6d1f9b0 R08: 0000000000000001 R09: 0000000000000001 [ 33.653903] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8801d4706c80 [ 33.661627] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8801d4706cd8 [ 33.669214] FS: 0000000000f01880(0063) GS:ffff8801db600000(0000) knlGS:0000000000000000 [ 33.678046] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.683918] CR2: 0000000020000400 CR3: 00000001d4f06000 CR4: 00000000001606b0 [ 33.691189] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.698451] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.705715] Stack: [ 33.707920] ffff8801d4f50088 ffff880100000001 ffff8801d4f50088 ffff8801d4f50000 [ 33.716053] ffff8801d4706c80 dffffc0000000000 ffff8801d4706cd8 0000000000000000 [ 33.724252] ffff8800b6d1fa20 ffffffff821d116b ffff8801d4f50430 ffff8801d4f50188 [ 33.732696] Call Trace: [ 33.735273] [] release_sock+0x17b/0x500 [ 33.740891] [] udp_sendmsg+0x1152/0x1c70 [ 33.746699] [] ? avc_has_perm_noaudit+0x2f0/0x2f0 [ 33.753185] [] ? udp_lib_close+0x20/0x20 [ 33.758883] [] ? udp_lib_unhash+0x630/0x630 [ 33.764972] [] ? trace_hardirqs_on+0x10/0x10 [ 33.771205] [] ? sock_has_perm+0x1c1/0x3f0 [ 33.777083] [] ? sock_has_perm+0x2a1/0x3f0 [ 33.783308] [] ? sock_has_perm+0x9f/0x3f0 [ 33.790356] [] ? selinux_msg_queue_alloc_security+0x2e0/0x2e0 [ 33.799221] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 33.805967] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 33.812730] [] ? check_preemption_disabled+0x3b/0x170 [ 33.822522] [] ? inet_sendmsg+0x143/0x4d0 [ 33.828312] [] inet_sendmsg+0x203/0x4d0 [ 33.833923] [] ? inet_sendmsg+0x73/0x4d0 [ 33.839768] [] ? inet_recvmsg+0x4c0/0x4c0 [ 33.845643] [] sock_sendmsg+0xbb/0x110 [ 33.851441] [] SyS_sendto+0x220/0x370 [ 33.856882] [] ? SyS_getpeername+0x2d0/0x2d0 [ 33.862932] [] ? udp_v4_get_port+0xcb/0x100 [ 33.869047] [] ? SyS_bind+0x18a/0x280 [ 33.874485] [] ? SyS_socketpair+0x520/0x520 [ 33.880447] [] ? get_unused_fd_flags+0xd0/0xd0 [ 33.886667] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 33.893616] [] ? check_preemption_disabled+0x3b/0x170 [ 33.900446] [] ? SyS_dup2+0x165/0x2f0 [ 33.906300] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.913211] [] entry_SYSCALL_64_fastpath+0x1e/0x9a [ 33.919774] 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 [ 33.948184] RIP [] udp_queue_rcv_skb+0x18f/0x1530 [ 33.954932] RSP [ 33.958613] ---[ end trace 669f7648cd36e616 ]--- [ 33.963726] Kernel panic - not syncing: Fatal exception in interrupt [ 33.971056] Kernel Offset: disabled [ 33.974808] Rebooting in 86400 seconds..