Bug 604188 - Guest suffers kernel panic when save snapshot then restart guest
Summary: Guest suffers kernel panic when save snapshot then restart guest
Alias: None
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: kvm
Version: 5.5
Hardware: All
OS: Linux
Target Milestone: rc
: ---
Assignee: Virtualization Maintenance
QA Contact: Virtualization Bugs
Keywords: Reopened, ZStream
Depends On: 542954
Blocks: 556823
TreeView+ depends on / blocked
Reported: 2010-06-15 15:03 UTC by RHEL Product and Program Management
Modified: 2013-01-09 22:44 UTC (History)
12 users (show)

Clone Of:
Last Closed: 2010-06-22 14:40:16 UTC

Attachments (Terms of Use)

External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2010:0479 normal SHIPPED_LIVE kvm bug fix update 2010-06-22 14:40:04 UTC

Description RHEL Product and Program Management 2010-06-15 15:03:24 UTC
This bug has been copied from bug #542954 and has been proposed
to be backported to 5.5 z-stream (EUS).

Comment 6 Lawrence Lim 2010-06-17 02:48:06 UTC
Comment from Kevin, QE please take note and make sure the suggestions made by
Kevin are well covered.


Anything that uses lots of synchronous reads/writes (i.e. metadata
operations). Long snapshots chains where a lot of COW happens seems to
be a good candidate.

It's probably enough to test intensively with one backing file format,
preferably qcow2 which may issue synchronous metadata I/O again and
therefore makes the scenario more complex.

For verification of the fix, you need to use virtio-blk (multiple
requests running at once are required to even trigger this bug). On the
other hand, only IDE can directly call synchronous bdrv_read/write which
is touched by this patch, so in order to avoid regressions some tests on
IDE should be run, too.


Comment 7 Qunfang Zhang 2010-06-17 07:19:42 UTC
Tested with the steps in bug #542954, and that issue does not happen on kvm-83-164.el5_5.12. Besides, we will do more test for this bug, and will upload the test result after finished.

Comment 8 Qunfang Zhang 2010-06-18 11:01:05 UTC
Test runners for verifying this bug:
https://tcms.engineering.redhat.com/run/10370/ (NFS)
https://tcms.engineering.redhat.com/run/10369/ (block device)

Result: Passed.
kvm version: kvm-83-164.el5_5.12

Comment 11 errata-xmlrpc 2010-06-22 14:40:16 UTC
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.


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