coredump at srscatlen

[enoa2014]

Stable most of the time

gdb stack:

Program terminated with signal 11, Segmentation fault.

0 0x00007f7f4a73d751 in memcpy () from /lib64/libc.so.6

Missing separate debuginfos, use: debuginfo-install glibc-2.12-1.149.el6_6.5.x86_64
(gdb) bt

0 0x00007f7f4a73d751 in memcpy () from /lib64/libc.so.6

1 0x00007f7f4ac523a5 in sdscatlen (

s=0x7f7e7fe73018 "*4\r\n$6\r\nHSETNX\r\n$29\r\ncid:2-1121964960-4-2930133422\r\n$13\r\nno-4-2"..., t=0xba1fc40, len=78) at sds.c:244

2 0x00007f7f4ac4f990 in __redisAppendCommand (c=0xf73700, cmd=, len=<v

3 0x00007f7f4ac506e7 in redisvAppendCommand (c=0xf73700, format=, ap=<

4 0x00007f7f4ac51c1d in redisvCommand (c=0xf73700, format=, ap=<value

5 0x00007f7f4ac51cd8 in redisCommand (c=, format=

and like #394 , cann't make it happen again.
someone help me explain what went wrong ?

os: CentOS release 6.5 (Final)
hiredis version: 0.11.0

Thanks.