kernel: [ 498.940505] vtund[9853]: segfault at 0 ip 0000000000408f40 sp 00007fff0817ab60 error 4 in vtund[400000+13000]

[renothing]

my environments:
   root@node:~# uname -a
Linux node. 3.13.0-67-generic #110-Ubuntu SMP Fri Oct 23 13:24:41 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
root@node:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.3 LTS
Release: 14.04
Codename: trusty

I test both 3.0.3-2.1 and 3.0.3-2, it dose not woking

this is error log in syslog

Nov 8 16:42:54 node kernel: [ 498.940505] vtund[9853]: segfault at 0 ip 0000000000408f40 sp 00007fff0817ab60 error 4 in vtund[400000+13000]

 here is my option

default {
  compress no; # Compression is off by default
  speed 0; # By default maximum speed, NO shaping
}

cobra {
  type tun; # IP tunnel
  proto tcp; # UDP protocol
  encrypt yes; # Encryption
  keepalive yes; # Keep connection alive
  multi killold; #control multiple connections. value c
...}

this is my strace log

9852 16:42:54.731246 brk(0) = 0x24f7000
9852 16:42:54.731332 brk(0x2518000) = 0x2518000
9852 16:42:54.731422 socket(PF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0) = 3
9852 16:42:54.731518 connect(3, {sa_family=AF_LOCAL, sun_path="/dev/log"}, 110) = 0
9852 16:42:54.731837 open("/etc/vtund.conf", O_RDONLY) = 4
9852 16:42:54.731987 ioctl(4, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, 0x7fff0817a490) = -1 ENOTTY (Inappropriate ioctl for device)
9852 16:42:54.732130 fstat(4, {st_mode=S_IFREG|0600, st_size=1149, ...}) = 0
9852 16:42:54.732321 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7305096000
9852 16:42:54.732418 read(4, "# ----- CUT HERE --- Server config --- CUT HERE -----\n#\noptions {\n port 5566;\t\t# Listen on this port.\n timeout 5;\n bindaddr { iface eth0; }; # Listen only on loopback device.\n\n # Syslog facility\n syslog \tdaemon;\n\n # Path to various programs\n ppp \t\t/usr/sbin/pppd; \n ifconfig \t/sbin/ifconfig;\n route \t/sbin/route;\n ip\t\t/sbin/ip;\n}\n\n# Default session options \ndefault {\n compress no; \t# Compression is off by default\n speed 0;\t\t# By default maximum speed, NO shaping\n}\n\n# the same as above, but with iproute2 command\ncobra {\n passwd dpqPlf8@12;\t# Password\n type tun;\t\t# IP tunnel \n proto tcp; \t\t# UDP protocol\n #compress zlib:3;\t# LZO compression level 9\n encrypt yes;\t\t# Encryption\n keepalive yes;\t# Keep connection alive\n multi killold;\t\t#control multiple connections. value can be yes or allow to allow multiple connections, no or deny to deny them or killold to allow new connection and kill old one. Ignored by the client.\n\n up {\n\t# Connection is Up \n\n\t# 10.3.0.1 - local, 10.3.0."..., 8192) = 1149
9852 16:42:54.732537 read(4, "", 4096) = 0
9852 16:42:54.732729 read(4, "", 8192) = 0
9852 16:42:54.732820 ioctl(4, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, 0x7fff0817a490) = -1 ENOTTY (Inappropriate ioctl for device)
9852 16:42:54.732918 close(4) = 0
9852 16:42:54.733006 munmap(0x7f7305096000, 4096) = 0
9852 16:42:54.733134 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f730508ba10) = 9853
9852 16:42:54.733789 exit_group(0) = ?
9852 16:42:54.733993 +++ exited with 0 +++