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Bug 1203119 - 2nd active commit after snapshot triggers qemu failure
Summary: 2nd active commit after snapshot triggers qemu failure
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: libvirt
Version: 7.1
Hardware: Unspecified
OS: Unspecified
high
urgent
Target Milestone: rc
: ---
Assignee: Eric Blake
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On: 1199182
Blocks:
TreeView+ depends on / blocked
 
Reported: 2015-03-18 07:28 UTC by Jan Kurik
Modified: 2015-03-26 17:54 UTC (History)
20 users (show)

Fixed In Version: libvirt-1.2.8-16.el7_1.2
Doc Type: Bug Fix
Doc Text:
Cause: qemu uses strcmp() instead of inode comparison when searching for a file name in a backing chain. However, it tracks a different initial string for a backing chain member when opening an existing chain than it does when creating a snapshot. Consequence: If libvirt passes a different string than what qemu is expecting, even though that string resolves to the same file, then qemu is unable to perform blockpull and blockcommit actions involving that part of the chain. Fix: Libvirt was taught to query qemu's notion of the string associated with a backing chain element. Result: It is now possible to create multiple snapshots and then use consecutive blockcommit to clean them up without hitting an error message from qemu complaining about an unknown file name.
Clone Of: 1199182
Environment:
Last Closed: 2015-03-26 17:54:35 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2015:0742 0 normal SHIPPED_LIVE libvirt bug fix update 2015-03-26 21:53:57 UTC

Description Jan Kurik 2015-03-18 07:28:42 UTC 
This bug has been copied from bug #1199182 and has been proposed
to be backported to 7.1 z-stream (EUS).
Comment 5 Jiri Denemark 2015-03-18 07:40:44 UTC 
Backport sent for review: http://post-office.corp.redhat.com/archives/rhvirt-patches/2015-March/msg00479.html
Comment 12 errata-xmlrpc 2015-03-26 17:54:35 UTC 
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.

https://rhn.redhat.com/errata/RHBA-2015-0742.html
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