Bug 683781
| Summary: | kvm: guest stale memory after migration [rhel-6.0.z] | ||
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| Product: | Red Hat Enterprise Linux 6 | Reporter: | RHEL Program Management <pm-rhel> |
| Component: | kernel | Assignee: | Frantisek Hrbata <fhrbata> |
| Status: | CLOSED ERRATA | QA Contact: | Red Hat Kernel QE team <kernel-qe> |
| Severity: | high | Docs Contact: | |
| Priority: | low | ||
| Version: | 6.0 | CC: | akong, bcao, dhoward, jasowang, llim, michen, mst, plyons, pm-eus, tburke |
| Target Milestone: | rc | Keywords: | ZStream |
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | kernel-2.6.32-71.20.1.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: | 2011-04-08 02:59:52 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: | 647367 | ||
| Bug Blocks: | |||
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Description
RHEL Program Management
2011-03-10 11:32:55 UTC
Tested on in I also tried on kernel-2.6.32-71.18.1.el6(patch not included)kernel-2.6.32-71.24.1.el6(patch included)&qemu-kvm-0.12.1.2-2.113.el6_0.8.x86_64 Repeat the steps in https://bugzilla.redhat.com/show_bug.cgi?id=642243#c1 100 times Actual Results: on kernel-2.6.32-71.18.1.el6 ,no kernel panic occurs in the guest ,can NOT reproduce this issue on kernel-2.6.32-71.24.1.el6 ,no kernel panic occurs in the guest Hi,Frantisek pls take a look the results above ,I can NOT reproduce on kernel-2.6.32-71.18.1.el6 ,I also tried 100 times on the fixed kernel ,also no kernel panic , Based on above ,How to deal with it ? Confirmed with mst, QE do patch check and regression test to verify this bug: 1. # grep 683781 kernel.spec - [virt] kvm: write protect memory after slot swap (Michael S. Tsirkin) [683781 647367] 2. Repeat the steps in https://bugzilla.redhat.com/show_bug.cgi?id=642243#c1 100 times on kernel-2.6.32-71.24.1.el6 ,no kernel panic occurs in the guest. 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-2011-0421.html
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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.
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