[....] Starting enhanced syslogd: rsyslogd[ 12.293590] audit: type=1400 audit(1540685943.411:4): 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 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 '10.128.0.20' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 42.426520] kasan: CONFIG_KASAN_INLINE enabled [ 42.431006] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 42.443899] Modules linked in: [ 42.447189] CPU: 1 PID: 2078 Comm: syz-executor246 Not tainted 4.4.162+ #117 [ 42.454394] task: ffff8800b698df00 task.stack: ffff8801d4338000 [ 42.460435] RIP: 0010:[] [] udp_queue_rcv_skb+0x18f/0x1530 [ 42.469400] RSP: 0018:ffff8801d433f970 EFLAGS: 00010206 [ 42.474842] RAX: dffffc0000000000 RBX: ffff8801cf188000 RCX: 0000000000000000 [ 42.482101] RDX: 000000000000000c RSI: ffffffff8246ea06 RDI: 0000000000000060 [ 42.489372] RBP: ffff8801d433f9b0 R08: 0000000000000001 R09: 0000000000000001 [ 42.496631] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8801d4e26b40 [ 42.503880] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8801d4e26b98 [ 42.511130] FS: 0000000000ef2880(0063) GS:ffff8801db700000(0000) knlGS:0000000000000000 [ 42.519332] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.525198] CR2: 0000000020000000 CR3: 00000001d4e20000 CR4: 00000000001606b0 [ 42.532449] Stack: [ 42.534572] ffff8801cf188088 ffff880100000001 ffff8801cf188088 ffff8801cf188000 [ 42.542721] ffff8801d4e26b40 dffffc0000000000 ffff8801d4e26b98 0000000000000000 [ 42.550765] ffff8801d433fa20 ffffffff821d134b ffff8801cf188430 ffff8801cf188188 [ 42.558764] Call Trace: [ 42.561381] [] release_sock+0x17b/0x500 [ 42.566994] [] udp_sendmsg+0x1152/0x1c70 [ 42.572690] [] ? avc_has_perm_noaudit+0x2f0/0x2f0 [ 42.579262] [] ? udp_lib_close+0x20/0x20 [ 42.584952] [] ? udp_lib_unhash+0x630/0x630 [ 42.590942] [] ? trace_hardirqs_on+0x10/0x10 [ 42.596991] [] ? sock_has_perm+0x1c1/0x3f0 [ 42.602868] [] ? sock_has_perm+0x2a1/0x3f0 [ 42.608729] [] ? sock_has_perm+0x9f/0x3f0 [ 42.614504] [] ? selinux_msg_queue_alloc_security+0x2e0/0x2e0 [ 42.622019] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 42.628757] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 42.635537] [] ? check_preemption_disabled+0x3b/0x170 [ 42.642375] [] ? inet_sendmsg+0x143/0x4d0 [ 42.648231] [] inet_sendmsg+0x203/0x4d0 [ 42.653839] [] ? inet_sendmsg+0x73/0x4d0 [ 42.659523] [] ? inet_recvmsg+0x4c0/0x4c0 [ 42.665299] [] sock_sendmsg+0xbb/0x110 [ 42.670822] [] SyS_sendto+0x220/0x370 [ 42.676260] [] ? SyS_getpeername+0x2d0/0x2d0 [ 42.682414] [] ? udp_v4_get_port+0xcb/0x100 [ 42.688370] [] ? SyS_bind+0x18a/0x280 [ 42.693813] [] ? SyS_socketpair+0x520/0x520 [ 42.699764] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 42.706500] [] ? check_preemption_disabled+0x3b/0x170 [ 42.713372] [] ? SyS_dup2+0x165/0x2f0 [ 42.718872] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 42.725454] [] entry_SYSCALL_64_fastpath+0x1e/0x9a [ 42.732005] Code: 74 24 58 41 f6 c6 01 0f 85 39 08 00 00 e8 da 82 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 [ 42.759112] RIP [] udp_queue_rcv_skb+0x18f/0x1530 [ 42.765778] RSP [ 42.769462] ---[ end trace 3c200d18e14fbc33 ]--- [ 42.774221] Kernel panic - not syncing: Fatal exception in interrupt [ 42.780945] Kernel Offset: disabled [ 42.784634] Rebooting in 86400 seconds..