Bug 360571 - kernel dm: bd_mount_sem counter corruption
kernel dm: bd_mount_sem counter corruption
Status: CLOSED ERRATA
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: kernel (Show other bugs)
5.0
All Linux
low Severity low
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Assigned To: Milan Broz
Martin Jenner
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Depends On:
Blocks:
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Reported: 2007-10-31 13:13 EDT by Milan Broz
Modified: 2013-02-28 23:05 EST (History)
3 users (show)

See Also:
Fixed In Version: RHBA-2008-0314
Doc Type: Bug Fix
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Last Closed: 2008-05-21 11:00:00 EDT
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Description Milan Broz 2007-10-31 13:13:18 EDT
There is bd_mount_sem counter corruption bug in device-mapper,
thaw_bdev() should be called only when freeze_bdev() was called for the
device.

Otherwise, thaw_bdev() will up bd_mount_sem and corrupt the semaphore counter.

see upstream commit of fix:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=ae9da83f6d800fe1f3b23bfbc8f7222ad1c5bb74
Comment 1 RHEL Product and Program Management 2007-10-31 13:16:03 EDT
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
release.
Comment 3 Don Zickus 2007-12-17 14:37:19 EST
in 2.6.18-61.el5
You can download this test kernel from http://people.redhat.com/dzickus/el5
Comment 6 errata-xmlrpc 2008-05-21 11:00:00 EDT
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 the 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.

http://rhn.redhat.com/errata/RHBA-2008-0314.html

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