[....] Starting enhanced syslogd: rsyslogd[ 13.513474] audit: type=1400 audit(1541724897.660:4): avc: denied { syslog } for pid=1921 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[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.51' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 39.141754] kasan: CONFIG_KASAN_INLINE enabled [ 39.146176] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 39.159185] Modules linked in: [ 39.162475] CPU: 0 PID: 2079 Comm: syz-executor550 Not tainted 4.4.162+ #119 [ 39.169634] task: ffff8801d4832f80 task.stack: ffff8801cf450000 [ 39.175664] RIP: 0010:[] [] udp_queue_rcv_skb+0x18f/0x1530 [ 39.184678] RSP: 0018:ffff8801cf457970 EFLAGS: 00010206 [ 39.190101] RAX: dffffc0000000000 RBX: ffff8800b66d8000 RCX: 0000000000000000 [ 39.197353] RDX: 000000000000000c RSI: ffffffff8247a7b6 RDI: 0000000000000060 [ 39.204646] RBP: ffff8801cf4579b0 R08: 0000000000000001 R09: 0000000000000001 [ 39.211901] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8800b87f7640 [ 39.219150] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8800b87f7698 [ 39.226398] FS: 000000000142d880(0063) GS:ffff8801db600000(0000) knlGS:0000000000000000 [ 39.234604] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.240460] CR2: 0000000020184000 CR3: 00000000b6cea000 CR4: 00000000001606b0 [ 39.247707] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.254953] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.262200] Stack: [ 39.264326] ffff8800b66d8088 ffff880000000001 ffff8800b66d8088 ffff8800b66d8000 [ 39.272394] ffff8800b87f7640 dffffc0000000000 ffff8800b87f7698 0000000000000000 [ 39.280397] ffff8801cf457a20 ffffffff821dd0fb ffff8800b66d8430 ffff8800b66d8188 [ 39.288405] Call Trace: [ 39.291016] [] release_sock+0x17b/0x500 [ 39.296626] [] udp_sendmsg+0x1152/0x1c70 [ 39.302389] [] ? avc_has_perm_noaudit+0x2f0/0x2f0 [ 39.308867] [] ? udp_lib_close+0x20/0x20 [ 39.314562] [] ? udp_lib_unhash+0x630/0x630 [ 39.320513] [] ? trace_hardirqs_on+0x10/0x10 [ 39.326550] [] ? sock_has_perm+0x1c1/0x3f0 [ 39.332525] [] ? sock_has_perm+0x2a1/0x3f0 [ 39.338389] [] ? sock_has_perm+0x9f/0x3f0 [ 39.344171] [] ? selinux_msg_queue_alloc_security+0x2e0/0x2e0 [ 39.351682] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 39.358415] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 39.365150] [] ? check_preemption_disabled+0x3b/0x170 [ 39.371966] [] ? inet_sendmsg+0x143/0x4d0 [ 39.377737] [] inet_sendmsg+0x203/0x4d0 [ 39.383435] [] ? inet_sendmsg+0x73/0x4d0 [ 39.389127] [] ? inet_recvmsg+0x4c0/0x4c0 [ 39.395004] [] sock_sendmsg+0xbb/0x110 [ 39.400525] [] SyS_sendto+0x220/0x370 [ 39.405954] [] ? SyS_getpeername+0x2d0/0x2d0 [ 39.412067] [] ? udp_v4_get_port+0xcb/0x100 [ 39.418022] [] ? SyS_bind+0x18a/0x280 [ 39.423454] [] ? SyS_socketpair+0x520/0x520 [ 39.429409] [] ? get_unused_fd_flags+0xd0/0xd0 [ 39.435621] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 39.442357] [] ? check_preemption_disabled+0x3b/0x170 [ 39.449173] [] ? SyS_dup2+0x165/0x2f0 [ 39.454662] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 39.461138] [] entry_SYSCALL_64_fastpath+0x1e/0x9a [ 39.467687] 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 [ 39.494976] RIP [] udp_queue_rcv_skb+0x18f/0x1530 [ 39.501576] RSP [ 39.505240] ---[ end trace 0004a2ebffdd7b5d ]--- [ 39.509993] Kernel panic - not syncing: Fatal exception in interrupt [ 39.516865] Kernel Offset: disabled [ 39.520471] Rebooting in 86400 seconds..