Bug 996151 - qcow2 corruption bug in cluster allocation code
qcow2 corruption bug in cluster allocation code
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: qemu-kvm (Show other bugs)
Unspecified Unspecified
urgent Severity urgent
: rc
: ---
Assigned To: Virtualization Maintenance
Virtualization Bugs
: ZStream
: 901573 (view as bug list)
Depends On: 974617
  Show dependency treegraph
Reported: 2013-08-12 10:11 EDT by Idith Tal-Kohen
Modified: 2014-02-17 18:18 EST (History)
19 users (show)

See Also:
Fixed In Version: qemu-kvm-
Doc Type: Bug Fix
Doc Text:
* Previously, a counter variable was not correctly reset when restarting an allocating request for disk images using the qcow2 format, which resulted in corruption of these disk images in the cluster allocation code in some cases. This update changes the way that the number of available clusters are counted in the qcow2 format, and qcow2 disks are no longer corrupted in the described scenario.
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Clone Of:
Last Closed: 2013-08-27 04:04:55 EDT
Type: ---
Regression: ---
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Documentation: ---
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
Reproduction - failed log (35.69 KB, text/plain)
2013-08-15 05:14 EDT, Qunfang Zhang
no flags Details
Verification - passed log (175.59 KB, text/plain)
2013-08-15 05:17 EDT, Qunfang Zhang
no flags Details

  None (edit)
Description Idith Tal-Kohen 2013-08-12 10:11:56 EDT
This bug has been copied from bug #974617 and has been proposed
to be backported to 6.4 z-stream (EUS).
Comment 6 Qunfang Zhang 2013-08-15 05:13:58 EDT
Reproduced this issue on qemu-kvm- at the first time attempt. Verified the bug with qemu-kvm- for twice, all passed.


0. Make sure host has 100GB+ free disk. 
1. Download 
2. Uncompress the lnv-382.tgz
3. ./create-disk
4. Modified "test-kvm" and replace command "kvm" to "/usr/libexec/qemu-kvm".
5. ./test-kvm

I will upload the attachment for detail logs for both reproduction (failed) and verification (passed) cases.
Comment 7 Qunfang Zhang 2013-08-15 05:14:58 EDT
Created attachment 786872 [details]
Reproduction - failed log
Comment 8 Qunfang Zhang 2013-08-15 05:17:08 EDT
Created attachment 786873 [details]
Verification - passed log
Comment 11 errata-xmlrpc 2013-08-27 04:04:55 EDT
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

Comment 12 Ayal Baron 2014-02-17 18:18:14 EST
*** Bug 901573 has been marked as a duplicate of this bug. ***

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