Bug 837691 - Data loss when writing to qcow2-format disk files
Summary: Data loss when writing to qcow2-format disk files
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: libguestfs
Version: 6.4
Hardware: Unspecified
OS: Unspecified
Target Milestone: rc
: ---
Assignee: Richard W.M. Jones
QA Contact: Virtualization Bugs
Depends On: 836710
TreeView+ depends on / blocked
Reported: 2012-07-04 19:47 UTC by Richard W.M. Jones
Modified: 2013-02-21 08:38 UTC (History)
7 users (show)

Fixed In Version: libguestfs-1.16.30-2.el6
Doc Type: Bug Fix
Doc Text:
Clone Of: 836710
: 837941 (view as bug list)
Last Closed: 2013-02-21 08:38:30 UTC
Target Upstream Version:

Attachments (Terms of Use)

System ID Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2013:0324 normal SHIPPED_LIVE libguestfs bug fix and enhancement update 2013-02-20 20:54:42 UTC

Description Richard W.M. Jones 2012-07-04 19:47:00 UTC
+++ This bug was initially created as a clone of Bug #836710 +++

For a full description of the bug, read this:


Note that we are very lucky: the bug does NOT affect RHEL 6.3
as far as I can tell from my testing.  However I think it'd
be a very good idea to backport the required fixes into
RHEL 6.4, and even consider a 6.3 z-stream fix.

Comment 1 RHEL Product and Program Management 2012-07-10 08:07:39 UTC
This request was not resolved in time for the current release.
Red Hat invites you to ask your support representative to
propose this request, if still desired, for consideration in
the next release of Red Hat Enterprise Linux.

Comment 2 RHEL Product and Program Management 2012-07-10 23:48:56 UTC
This request was erroneously removed from consideration in Red Hat Enterprise Linux 6.4, which is currently under development.  This request will be evaluated for inclusion in Red Hat Enterprise Linux 6.4.

Comment 5 Richard W.M. Jones 2012-11-02 08:15:14 UTC
(In reply to comment #4)
> Rich,
> for the qemu version, in your env, the qemu version is
> qemu-system-x86-1.0-17.fc18.x86_64, but in RHEL6.x, qemu-kvm is from
> upstream version qemu-0.12, so i need an upstream version of qemu to
> reproduce this bug, so far, i didn't see how to reproduce and verify this
> bug in rhel6.x? any suggestion for this?

There isn't any version of qemu-kvm in RHEL 6 which exhibits
the crashing bug (luckily!).  You could try an upstream version,
but probably a better idea is to modify upstream qemu so it
crashes deliberately on shutdown.

I just had a quick look at the source, and *maybe* adding
a call to abort() in vl.c: qemu_kill_report() ?

I can have a look into this in more detail later.

Comment 10 errata-xmlrpc 2013-02-21 08:38:30 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.


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