This problem seems to be a result of NPTL (Native POSIX Thread Library for Linux) that comes with Red Hat 9. Try setting the LD_ASSUME_KERNEL environment variable before starting OGo:

export LD_ASSUME_KERNEL=2.4.1

If that doesn't solve the problem, please provide feedback on the users mailing list!

Update 2004-11-11: This issue is fixed beginning with OGo 1.0a releases, so you don't need to set the mentioned variable anymore.