Linux Centos 5
Firebird SuperServer 1.5.3
Php 5.1.4
Jboss 4.0.1
Apache 2.0.59

When run a process and server is about 100%, firebird crash and
restart. The following message appears in Firebird.log

tux (Client) Mon Nov 26 17:41:29 2007
/opt/firebird/bin/fbguard: bin/fbserver terminated abnormally (-1)

What's happening?

Regards.