Bug 718664
| Summary: | Migration from host RHEL6.1+ to host RHEL6.0.z failed with floppy | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | jason wang <jasowang> |
| Component: | qemu-kvm | Assignee: | jason wang <jasowang> |
| Status: | CLOSED ERRATA | QA Contact: | Virtualization Bugs <virt-bugs> |
| Severity: | high | Docs Contact: | |
| Priority: | high | ||
| Version: | 6.2 | CC: | alex.williamson, bcao, bsarathy, ehabkost, flang, juzhang, martinez, michen, mkenneth, qzhang, rhod, rwu, syeghiay, tburke, virt-maint, xfu |
| Target Milestone: | rc | Keywords: | Regression, Reopened |
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | qemu-kvm-0.12.1.2-2.187.el6 | Doc Type: | Bug Fix |
| Doc Text: |
Cause:
In order to save media_changed flag of floppy across migration, a new subsection were introduced, and the subsection were sent when the floppy were not changed ( media_changed is zero ). This would as the subsection would be sent almost every time.
Consequence:
As qemu-kvm would fail the migration when it met the subsection it does not recongize, this would cause the migration from newer qemu-kvm version to elder version with floppy fail.
Fix:
In order to keep the migration compatibility, the fix only accept the subseciont but do nothing and also disable the sending of the subsection.
Result:
The migration between any version of qemu-kvm with floopy would success.
|
Story Points: | --- |
| Clone Of: | 713389 | Environment: | |
| Last Closed: | 2011-12-06 15:53:04 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 713389 | ||
| Bug Blocks: | 743047 | ||
|
Comment 8
langfang
2011-09-21 08:37:17 UTC
(In reply to comment #8) > Reproduced this issue with hostA(rhel6.2):qemu-kvm-0.12.1.2-2.184.el6.x86_64 > kernel:2.6.32-198.el6.x86_64 > hostB(rhel6.0.z):qemu-kvm-0.12.1.2-2.113.el6.x86_64 > kernel:2.6.32-71.31.1.el6.x86_64 > steps: > 1.boot guest with floopy > #/usr/libexec/qemu-kvm ...-drive > file=/mnt/virtio-driver-1.vfd,if=floppy,format=raw > 2.do migrate form hostA to hostB > > Results:migrate failed > show the below fail message > qemu: warning: error while loading state for instance 0x0 of device 'ram' > load of migration failed > > > Veriry this issue with hostA(rhel6.2):qemu-kvm-0.12.1.2-2.190.el6.x86_64 > kernel:2.6.32-198.el6.x86_64 > hostB(rhel6.0.z):qemu-kvm-0.12.1.2-2.113.el6.x86_64 > kernel:2.6.32-71.31.1.el6.x86_64 using steps as same as reproduce > > Results:show the same error as same as reproduce > > Actual results: > migrate successful > > > Above all,this issue still have problem,there have a bug698936 about the same > problem, Maybe this bug should modify first,then this issue will be resolved.Or > this is a new bug?thanks~~ Looks realted, And can you try doing an offline migration to test this bz? Just stop the machine before doing the migration. Thanks Reproduced this issue with hostA(rhel6.2):qemu-kvm-0.12.1.2-2.184.el6.x86_64 kernel:2.6.32-198.el6.x86_64 hostB(rhel6.0.z):qemu-kvm-0.12.1.2-2.113.el6.x86_64 kernel:2.6.32-71.31.1.el6.x86_64 steps: 1.boot guest with floopy #/usr/libexec/qemu-kvm ...-drive file=/mnt/virtio-driver-1.vfd,if=none,id=drive-fdc0-0-0,format=raw,cache=none -global isa-fdc.driveA=drive-fdc0-0-0 2.do migrate form hostA to hostB Results:migrate failed show the below fail message qemu-kvm-0.12.1.2-2.184.el6.x86_64 qemu: warning: error while loading state for instance 0x3f0 of device 'fdc' load of migration failed Veriry this issue with hostA(rhel6.2):qemu-kvm-0.12.1.2-2.189.el6.x86_64 kernel:2.6.32-198.el6.x86_64 hostB(rhel6.0.z):qemu-kvm-0.12.1.2-2.113.el6.x86_64 kernel:2.6.32-71.31.1.el6.x86_64 using steps as same as reproduce Results: migrate successful Above all,this issue have been fixed. addtional info: this kind of migration only support vnc boot guest,not support spice.
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New Contents:
Cause:
In order to save media_changed flag of floppy across migration, a new subsection were introduced, and the subsection were sent when the floppy were not changed ( media_changed is zero ). This would as the subsection would be sent almost every time.
Consequence:
As qemu-kvm would fail the migration when it met the subsection it does not recongize, this would cause the migration from newer qemu-kvm version to elder version with floppy fail.
Fix:
In order to keep the migration compatibility, the fix only accept the subseciont but do nothing and also disable the sending of the subsection.
Result:
The migration between any version of qemu-kvm with floopy would success.
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. http://rhn.redhat.com/errata/RHSA-2011-1531.html |