My server enviroment:nginx 0.8.40+fastcgi,and recently have this problem in /var/messages which cause my nginx down:

[b][color=#9999FF]localhost kernel: nginx[31052]: segfault at 0000000000000008 rip 0000000000466456 rsp 00007fffa6c110a0 error 6[/color][/b]

This problem is a little bit frequently,someone know what's problem?Appreciate!