[....] Starting enhanced syslogd: rsyslogd[ 13.898589] audit: type=1400 audit(1551210838.869:4): avc: denied { syslog } for pid=1915 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] 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 '10.128.10.50' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 37.833275] kasan: CONFIG_KASAN_INLINE enabled [ 37.837700] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 37.850658] Modules linked in: [ 37.853988] CPU: 0 PID: 2074 Comm: syz-executor668 Not tainted 4.4.174+ #4 [ 37.860972] task: ffff8800b71317c0 task.stack: ffff8801d41f0000 [ 37.867002] RIP: 0010:[] [] udpv6_queue_rcv_skb+0x18d/0x14d0 [ 37.876210] RSP: 0018:ffff8801d41f79e8 EFLAGS: 00010206 [ 37.881629] RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000000 [ 37.888916] RDX: 000000000000000c RSI: ffffffff82615684 RDI: 0000000000000060 [ 37.896166] RBP: ffff8801d41f7a30 R08: 0000000000000000 R09: 0000000000000001 [ 37.903409] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8800b6430000 [ 37.910761] R13: ffff8800b7065780 R14: 0000000000000000 R15: ffff8800b70657d8 [ 37.918025] FS: 0000000002011880(0063) GS:ffff8801db600000(0000) knlGS:0000000000000000 [ 37.926260] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.932113] CR2: 0000000020000080 CR3: 00000000ba369000 CR4: 00000000001606b0 [ 37.939359] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.946604] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.953845] Stack: [ 37.955967] ffff8800b71317c0 ffff880000000001 ffff8800b6430088 ffff8800b6430088 [ 37.964052] ffff8800b6430000 ffff8800b7065780 dffffc0000000000 ffff8800b6430088 [ 37.972034] 0000000000000000 ffff8801d41f7aa0 ffffffff821e5e40 ffff8800b6430430 [ 37.980072] Call Trace: [ 37.982638] [] release_sock+0x170/0x500 [ 37.988235] [] udpv6_sendmsg+0x8d8/0x24f0 [ 37.994007] [] ? udp_lib_close+0x20/0x20 [ 37.999692] [] ? udp_v6_flush_pending_frames+0xe0/0xe0 [ 38.006596] [] ? sock_has_perm+0x2a8/0x400 [ 38.012466] [] ? sock_has_perm+0xa6/0x400 [ 38.018279] [] ? selinux_msg_queue_alloc_security+0x2e0/0x2e0 [ 38.025786] [] ? udp_lib_get_port+0x701/0xdf0 [ 38.031903] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 38.038630] [] ? check_preemption_disabled+0x3c/0x200 [ 38.045455] [] ? check_preemption_disabled+0x3c/0x200 [ 38.052268] [] ? inet_sendmsg+0x143/0x4d0 [ 38.058040] [] inet_sendmsg+0x202/0x4d0 [ 38.063638] [] ? inet_sendmsg+0x76/0x4d0 [ 38.069318] [] ? inet_recvmsg+0x4d0/0x4d0 [ 38.075090] [] sock_sendmsg+0xbe/0x110 [ 38.080684] [] SyS_sendto+0x201/0x340 [ 38.086112] [] ? SyS_getpeername+0x2a0/0x2a0 [ 38.092148] [] ? inet6_bind+0x141/0x11d0 [ 38.097832] [] ? SyS_socketpair+0x510/0x510 [ 38.103784] [] ? retint_user+0x18/0x3c [ 38.109295] [] ? trace_hardirqs_on_caller+0x385/0x5a0 [ 38.116111] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 38.122622] [] entry_SYSCALL_64_fastpath+0x1e/0x9a [ 38.129194] Code: 8b 75 58 41 f6 c6 01 0f 85 d9 07 00 00 e8 6c 3f cf 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 8b 0e 00 00 41 f6 46 60 04 [ 38.155969] RIP [] udpv6_queue_rcv_skb+0x18d/0x14d0 [ 38.162771] RSP [ 38.166417] ---[ end trace 53711117613fb82c ]--- [ 38.171190] Kernel panic - not syncing: Fatal exception in interrupt [ 38.177990] Kernel Offset: disabled [ 38.181601] Rebooting in 86400 seconds..