Red Hat Bugzilla – Bug 442579
Backport fix for possible data corruption in mark_buffer_dirty on SMP
Last modified: 2009-05-18 15:32:32 EDT
+++ This bug was initially created as a clone of Bug #442577 +++
Description of problem:
Function mark_buffer_dirty() contains SMP-unsafe optimization. If CPU reorders
instructions in certain way, it may cause that modified data are not written and
filesystem corruption happens.
For discussion, see the thread at
There are several possible fixes with different performance and complexity (see
the thread), the one that went into upstream kernel is this:
Version-Release number of selected component (if applicable):
Can't be reproduced, was found during source code review.
If data corruption because of this bug ever happened, it would be very hard to
link the corruption to this problem --- so maybe it would be better to fix the
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release. Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products. This request is not yet committed for inclusion in an Update
Updating PM score.
Committed in 78.9.EL . RPMS are available at http://people.redhat.com/vgoyal/rhel4/
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.