[....] Starting enhanced syslogd: rsyslogd[ 13.499666] audit: type=1400 audit(1541723072.637:4): 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 '10.128.10.37' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 65.808508] kasan: CONFIG_KASAN_INLINE enabled [ 65.812977] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 65.825826] Modules linked in: [ 65.829189] CPU: 1 PID: 2094 Comm: syz-executor117 Not tainted 4.4.162+ #9 [ 65.836175] task: ffff8800b7000000 task.stack: ffff8801d4298000 [ 65.842204] RIP: 0010:[] [] udp_queue_rcv_skb+0x18f/0x1530 [ 65.851205] RSP: 0018:ffff8801d429f8f8 EFLAGS: 00010206 [ 65.856807] RAX: dffffc0000000000 RBX: ffff8800b6558000 RCX: 0000000000000000 [ 65.864058] RDX: 000000000000000c RSI: ffffffff8247a7b6 RDI: 0000000000000060 [ 65.871305] RBP: ffff8801d429f938 R08: 0000000000000001 R09: 0000000000000001 [ 65.878547] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8800b7b74780 [ 65.885801] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8800b7b747d8 [ 65.893051] FS: 0000000000000000(0000) GS:ffff8801db700000(0063) knlGS:0000000008625840 [ 65.901257] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 65.907117] CR2: 0000000020184000 CR3: 00000000b8249000 CR4: 00000000001606b0 [ 65.914360] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 65.921605] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 65.928844] Stack: [ 65.930963] ffff8800b6558088 ffff880000000001 ffff8800b6558088 ffff8800b6558000 [ 65.938945] ffff8800b7b74780 dffffc0000000000 ffff8800b7b747d8 0000000000000000 [ 65.946921] ffff8801d429f9a8 ffffffff821dd0fb ffff8800b6558430 ffff8800b6558188 [ 65.954911] Call Trace: [ 65.957474] [] release_sock+0x17b/0x500 [ 65.963080] [] udp_sendmsg+0x1152/0x1c70 [ 65.968781] [] ? avc_has_perm_noaudit+0x2f0/0x2f0 [ 65.975368] [] ? udp_lib_close+0x20/0x20 [ 65.981068] [] ? udp_lib_unhash+0x630/0x630 [ 65.987021] [] ? trace_hardirqs_on+0x10/0x10 [ 65.993053] [] ? sock_has_perm+0x1c1/0x3f0 [ 65.998913] [] ? sock_has_perm+0x2a1/0x3f0 [ 66.004777] [] ? sock_has_perm+0x9f/0x3f0 [ 66.010546] [] ? selinux_msg_queue_alloc_security+0x2e0/0x2e0 [ 66.018051] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 66.024787] [] ? check_preemption_disabled+0x3b/0x170 [ 66.031599] [] ? inet_sendmsg+0x143/0x4d0 [ 66.037440] [] inet_sendmsg+0x203/0x4d0 [ 66.043044] [] ? inet_sendmsg+0x73/0x4d0 [ 66.048740] [] ? inet_recvmsg+0x4c0/0x4c0 [ 66.054512] [] sock_sendmsg+0xbb/0x110 [ 66.060024] [] SyS_sendto+0x220/0x370 [ 66.065447] [] ? SyS_getpeername+0x2d0/0x2d0 [ 66.071551] [] ? udp_v4_get_port+0xcb/0x100 [ 66.077507] [] ? trace_hardirqs_on+0x10/0x10 [ 66.083543] [] ? SyS_bind+0x18a/0x280 [ 66.088970] [] ? SyS_socketpair+0x520/0x520 [ 66.094921] [] ? get_unused_fd_flags+0xd0/0xd0 [ 66.101136] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 66.107866] [] ? check_preemption_disabled+0x3b/0x170 [ 66.114682] [] ? SyS_dup2+0x165/0x2f0 [ 66.120108] [] ? do_fast_syscall_32+0xdb/0xa80 [ 66.126507] [] ? SyS_getpeername+0x2d0/0x2d0 [ 66.132543] [] do_fast_syscall_32+0x31e/0xa80 [ 66.138664] [] sysenter_flags_fixed+0xd/0x1a [ 66.144691] Code: 74 24 58 41 f6 c6 01 0f 85 39 08 00 00 e8 2a c5 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 d1 0e 00 00 41 f6 46 60 04 [ 66.171751] RIP [] udp_queue_rcv_skb+0x18f/0x1530 [ 66.178524] RSP [ 66.182176] ---[ end trace 6980aca41371460a ]--- [ 66.186917] Kernel panic - not syncing: Fatal exception in interrupt [ 66.193686] Kernel Offset: disabled [ 66.197289] Rebooting in 86400 seconds..