Bug 647367
| Summary: | kvm: guest stale memory after migration | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | Michael S. Tsirkin <mst> |
| Component: | kernel | Assignee: | Michael S. Tsirkin <mst> |
| Status: | CLOSED ERRATA | QA Contact: | Virtualization Bugs <virt-bugs> |
| Severity: | high | Docs Contact: | |
| Priority: | low | ||
| Version: | 6.0 | CC: | akong, bcao, dhoward, jasowang, llim, plyons, tburke |
| Target Milestone: | rc | Keywords: | ZStream |
| Target Release: | 6.1 | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | kernel-2.6.32-83.el6 | Doc Type: | Bug Fix |
| Doc Text: |
Migrating a guest could have resulted in dirty values for the guest being retained in memory, which could have caused both the guest and qemu to crash. The trigger for this was memory pages being both write-protected and dirty simultaneously. With this update, memory pages in the current bitmap are either dirty or write-protected when migrating a guest, with the result that neither qemu nor guest operating systems crash following a migration.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2011-05-23 20:27:46 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: | |||
| Bug Blocks: | 580951, 658437, 683781 | ||
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Description
Michael S. Tsirkin
2010-10-28 06:09:05 UTC
Fix: commit ae8894c00b560bde4cbbc2115f532df997e15d14 upstream This request was evaluated by Red Hat Product Management for inclusion in a Red Hat Enterprise Linux maintenance release. Product Management has requested further review of this request by Red Hat Engineering, for potential inclusion in a Red Hat Enterprise Linux Update release for currently deployed products. This request is not yet committed for inclusion in an Update release. *** Bug 647964 has been marked as a duplicate of this bug. *** Patch(es) available on kernel-2.6.32-83.el6 This bug will affect vhost on and off, I think this is same as https://bugzilla.redhat.com/show_bug.cgi?id=642243 Based on https://bugzilla.redhat.com/show_bug.cgi?id=642243#c15 , this issue has been fix ald. *** Bug 642243 has been marked as a duplicate of this bug. *** based on comment#11 ,change status to VERIFIED.
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New Contents:
Migrating a guest could have resulted in dirty values for the guest being retained in memory, which could have caused both the guest and qemu to crash. The trigger for this was memory pages being both write-protected and dirty simultaneously. With this update, memory pages in the current bitmap are either dirty or write-protected when migrating a guest, with the result that neither qemu nor guest operating systems crash following a migration.
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. http://rhn.redhat.com/errata/RHSA-2011-0542.html |