Red Hat Bugzilla – Full Text Bug Listing
|Summary:||Data loss when writing to qcow2-format disk files|
|Product:||Red Hat Enterprise Linux 7||Reporter:||Richard W.M. Jones <rjones>|
|Component:||libguestfs||Assignee:||Richard W.M. Jones <rjones>|
|Status:||CLOSED CURRENTRELEASE||QA Contact:||Virtualization Bugs <virt-bugs>|
|Version:||7.0||CC:||acathrow, bfan, juzhang, knoel, leiwang, mbooth, qguan, rjones|
|Fixed In Version:||Doc Type:||Bug Fix|
|Doc Text:||Story Points:||---|
|Last Closed:||2013-07-18 12:01:08 EDT||Type:||Bug|
|oVirt Team:||---||RHEL 7.3 requirements from Atomic Host:|
|Bug Depends On:||836710|
Description Richard W.M. Jones 2012-07-05 17:18:51 EDT
+++ This bug was initially created as a clone of Bug #836710 +++ For a full description of the bug, read this: https://www.redhat.com/archives/libguestfs/2012-July/msg00020.html
Comment 2 bfan 2013-07-05 04:34:46 EDT
Hello, I tried your script and do more than 500 runs, it has no error output. https://bugzilla.redhat.com/show_bug.cgi?id=836710#c5 Is there need other steps to repoduce?
Comment 3 Richard W.M. Jones 2013-07-05 05:17:33 EDT
(In reply to bfan from comment #2) > Hello, > I tried your script and do more than 500 runs, it has no error output. > https://bugzilla.redhat.com/show_bug.cgi?id=836710#c5 > > Is there need other steps to repoduce? This was actually a bug in qemu. The problem was that qemu's qcow2 code used to crash, and libguestfs didn't detect the crash (so instead you would just get occasional lost data writes). Since then: - qemu was fixed so the qcow2 code no longer crashes - the kernel was fixed so it issues a write barrier for sync - libguestfs has been modified to add a guestfs_shutdown call to detect these crashes and report the error instead of ignoring it. Since this was all fixed a long time ago, it's unlikely that you will be able to reproduce the bug. You would have to go back to some quite old versions of qemu, kernel and libguestfs. My suggestion is that we close this bug. Even if the qemu bug reappears, libguestfs will now detect and report it.
Comment 4 Richard W.M. Jones 2013-07-18 12:01:08 EDT
I am closing this, based on my previous comment.