This is a third-party bug report. It appears that on RHEL 5.5 a pthread mutex in shared memory cannot be used by a combination of 32-bit and 64-bit apps. I realize that posix doesn't guarantee that this will work since they are technically different programming models, but it seems like a useful capability to have.
oops, sorry guys. I tried to reload the bug report but generated a new one. *** This bug has been marked as a duplicate of 11651 ***