[CentOS] ext3_free_blocks_sb: bit already cleared for block

I opened bug 494927 with Red Hat after seeing this kernel error on two 
different hosts, just a few days after updating or installing CentOS 5.3:
https://bugzilla.redhat.com/show_bug.cgi?id=494927

Has anyone else seen this yet?  The patch that RH included in 
kernel-2.6.9-78.0.17.EL.src.rpm to fix the problem appears to have been 
in their 2.6.18 rpm since revision 15, so something else is apparently 
causing the same problem.

I'm running bonnie++ in a loop on a VM running the affected kernel 
hoping to duplicate the problem.