Database engine error

Hello,

we are using FireBird 1.5 final on a Linux Mandrake kernel 2.6.7 with a Intel Xeon bi-processor, and we encounter a recurrent problem. The database engine doesn't respond to new connection or order. The command /etc/init.d/fbserver stop doesn't work.

In the Firebird logs, we have the following lines corresponding to the database engine problem that we encounter :

[root@firebird firebird]# cat /opt/firebird/firebird.log | grep "SCH" -B 1
firebird.ines.fr (Server) Fri Sep 17 15:15:05 2004
SCH_validate -- wrong thread
--
.......
--
firebird.ines.fr (Server) Wed Nov 10 10:49:56 2004
SCH_validate -- not entered

Does anybody has already encountered this problem ?
And does anybody have advices to bypass this problem ?

Thanks for your help

David