[....] Starting enhanced syslogd: rsyslogd[ 15.638693] audit: type=1400 audit(1550609365.648:4): avc: denied { syslog } for pid=1919 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 OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.62' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 32.705663] kasan: CONFIG_KASAN_INLINE enabled [ 32.710345] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 32.723223] Modules linked in: [ 32.726530] CPU: 1 PID: 2072 Comm: syz-executor114 Not tainted 4.4.174+ #4 [ 32.733517] task: ffff8801d5c5c740 task.stack: ffff8800b6f48000 [ 32.739637] RIP: 0010:[] [] udp_queue_rcv_skb+0x18d/0x14e0 [ 32.748591] RSP: 0018:ffff8800b6f4f9f0 EFLAGS: 00010206 [ 32.754452] RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000000 [ 32.761702] RDX: 000000000000000c RSI: ffffffff824813a4 RDI: 0000000000000060 [ 32.769182] RBP: ffff8800b6f4fa30 R08: 0000000000000000 R09: 0000000000000001 [ 32.776498] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d4660000 [ 32.783842] R13: ffff8801d7321780 R14: 0000000000000000 R15: ffff8801d73217d8 [ 32.791099] FS: 00000000013ce880(0063) GS:ffff8801db700000(0000) knlGS:0000000000000000 [ 32.799315] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.805175] CR2: 0000000020000000 CR3: 00000001d86b0000 CR4: 00000000001606b0 [ 32.812469] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.819784] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.827032] Stack: [ 32.829157] ffff8801d4660000 ffff880100000001 ffff8801d4660088 ffff8801d4660000 [ 32.837330] ffff8801d7321780 dffffc0000000000 ffff8801d4660088 0000000000000000 [ 32.845437] ffff8800b6f4faa0 ffffffff821e5e40 ffff8801d4660430 ffff8801d4660188 [ 32.853568] Call Trace: [ 32.856154] [] release_sock+0x170/0x500 [ 32.861808] [] udp_sendmsg+0x1176/0x1c60 [ 32.867507] [] ? __lock_acquire+0xa4f/0x4f50 [ 32.873750] [] ? udp_lib_close+0x20/0x20 [ 32.879529] [] ? udp_lib_unhash+0x630/0x630 [ 32.885487] [] ? trace_hardirqs_on+0x10/0x10 [ 32.891745] [] ? sock_has_perm+0x2a8/0x400 [ 32.897612] [] ? sock_has_perm+0xa6/0x400 [ 32.903458] [] ? selinux_msg_queue_alloc_security+0x2e0/0x2e0 [ 32.910977] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 32.917712] [] ? check_preemption_disabled+0x3c/0x200 [ 32.924528] [] ? check_preemption_disabled+0x3c/0x200 [ 32.931461] [] ? inet_sendmsg+0x143/0x4d0 [ 32.937342] [] inet_sendmsg+0x202/0x4d0 [ 32.942943] [] ? inet_sendmsg+0x76/0x4d0 [ 32.948632] [] ? inet_recvmsg+0x4d0/0x4d0 [ 32.954411] [] sock_sendmsg+0xbe/0x110 [ 32.959924] [] SyS_sendto+0x201/0x340 [ 32.965348] [] ? SyS_getpeername+0x2a0/0x2a0 [ 32.971462] [] ? SyS_socketpair+0x510/0x510 [ 32.977418] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 32.984153] [] ? check_preemption_disabled+0x3c/0x200 [ 32.990974] [] ? check_preemption_disabled+0x3c/0x200 [ 32.997799] [] ? SyS_dup2+0x165/0x2f0 [ 33.003236] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.009711] [] entry_SYSCALL_64_fastpath+0x1e/0x9a [ 33.016372] Code: 8b 75 58 41 f6 c6 01 0f 85 f9 07 00 00 e8 4c 82 e8 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 6a 0e 00 00 41 f6 46 60 04 [ 33.044214] RIP [] udp_queue_rcv_skb+0x18d/0x14e0 [ 33.050812] RSP [ 33.054552] ---[ end trace 15e080a8c7ddcb53 ]--- [ 33.059321] Kernel panic - not syncing: Fatal exception in interrupt [ 33.066172] Kernel Offset: disabled [ 33.069784] Rebooting in 86400 seconds..