[....] Starting enhanced syslogd: rsyslogd[ 13.348653] audit: type=1400 audit(1538279113.481:4): 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 '10.128.0.42' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 34.462940] kasan: CONFIG_KASAN_INLINE enabled [ 34.467529] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 34.480505] Modules linked in: [ 34.483999] CPU: 0 PID: 2077 Comm: syz-executor361 Not tainted 4.4.159+ #106 [ 34.491174] task: ffff8800b7058000 task.stack: ffff8801d4e50000 [ 34.497218] RIP: 0010:[] [] udp_queue_rcv_skb+0x18f/0x1530 [ 34.506183] RSP: 0018:ffff8801d4e57970 EFLAGS: 00010206 [ 34.511616] RAX: dffffc0000000000 RBX: ffff8801d44c0000 RCX: 0000000000000000 [ 34.519028] RDX: 000000000000000c RSI: ffffffff8246e916 RDI: 0000000000000060 [ 34.526293] RBP: ffff8801d4e579b0 R08: 0000000000000001 R09: 0000000000000001 [ 34.533553] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8800b8157780 [ 34.540826] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8800b81577d8 [ 34.548192] FS: 0000000001476880(0063) GS:ffff8801db600000(0000) knlGS:0000000000000000 [ 34.556411] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.562280] CR2: 00000000200000c0 CR3: 00000001d4dc7000 CR4: 00000000001606b0 [ 34.569541] Stack: [ 34.571673] ffff8801d44c0088 ffff880000000001 ffff8801d44c0088 ffff8801d44c0000 [ 34.579674] ffff8800b8157780 dffffc0000000000 ffff8800b81577d8 0000000000000000 [ 34.587714] ffff8801d4e57a20 ffffffff821d0a7b ffff8801d44c0430 ffff8801d44c0188 [ 34.595720] Call Trace: [ 34.598292] [] release_sock+0x17b/0x500 [ 34.603912] [] udp_sendmsg+0x1152/0x1c70 [ 34.609629] [] ? avc_has_perm_noaudit+0x2f0/0x2f0 [ 34.616121] [] ? udp_lib_close+0x20/0x20 [ 34.621817] [] ? udp_lib_unhash+0x630/0x630 [ 34.627769] [] ? trace_hardirqs_on+0x10/0x10 [ 34.633812] [] ? sock_has_perm+0x1c1/0x3f0 [ 34.639683] [] ? sock_has_perm+0x2a1/0x3f0 [ 34.645553] [] ? sock_has_perm+0x9f/0x3f0 [ 34.651375] [] ? selinux_msg_queue_alloc_security+0x2e0/0x2e0 [ 34.658896] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 34.665632] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 34.672369] [] ? check_preemption_disabled+0x3b/0x170 [ 34.679197] [] ? inet_sendmsg+0x143/0x4d0 [ 34.684975] [] inet_sendmsg+0x203/0x4d0 [ 34.690581] [] ? inet_sendmsg+0x73/0x4d0 [ 34.696273] [] ? inet_recvmsg+0x4c0/0x4c0 [ 34.702054] [] sock_sendmsg+0xbb/0x110 [ 34.707619] [] SyS_sendto+0x220/0x370 [ 34.713053] [] ? SyS_getpeername+0x2d0/0x2d0 [ 34.719094] [] ? udp_v4_get_port+0xcb/0x100 [ 34.725046] [] ? SyS_bind+0x18a/0x280 [ 34.730477] [] ? SyS_socketpair+0x520/0x520 [ 34.736430] [] ? get_unused_fd_flags+0xd0/0xd0 [ 34.742642] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 34.749474] [] ? check_preemption_disabled+0x3b/0x170 [ 34.756297] [] ? SyS_dup2+0x165/0x2f0 [ 34.761730] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 34.768315] [] entry_SYSCALL_64_fastpath+0x1e/0x9a [ 34.775000] Code: 74 24 58 41 f6 c6 01 0f 85 39 08 00 00 e8 6a 85 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 [ 34.802628] RIP [] udp_queue_rcv_skb+0x18f/0x1530 [ 34.809287] RSP [ 34.812955] ---[ end trace 620303a2ce9ce0fe ]--- [ 34.817709] Kernel panic - not syncing: Fatal exception in interrupt [ 34.824497] Kernel Offset: disabled [ 34.828111] Rebooting in 86400 seconds..