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.