Bug 499598

Summary: Save/restore of F-11 Xen domU guest fails after several iterations
Product: [Fedora] Fedora Reporter: Chris Lalancette <clalance>
Component: kernelAssignee: Xen Maintainance List <xen-maint>
Status: CLOSED DUPLICATE QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: low    
Version: rawhideCC: itamar, kernel-maint, quintela
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OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2009-05-07 12:26:05 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Chris Lalancette 2009-05-07 11:36:32 UTC 
Description of problem:
While running the Xen-domu-stress-save-restore.c on a 64-bit F-11 domU in the Fedora Virt Test Day (step 6) here: https://fedoraproject.org/wiki/QA:Testcase_Virtualization_XenDomU_Save_and_restore, I encountered a failure after a few save/restore iterations.  It's not entirely clear to me at this point whether it is a dom0 bug or a domU bug, but since this works on the same dom0 with a RHEL-5 domU, I'll start with domU.  The only clue I have currently is in the /var/log/xen/xend.log from the dom0; when it failed, it printed this to the log:

[2009-05-07 07:27:53 xend 4071] DEBUG (XendCheckpoint:217) [xc_restore]: /usr/lib64/xen/bin/xc_restore 25 45 1 2 0 0 0
[2009-05-07 07:27:53 xend 4071] INFO (XendCheckpoint:353) xc_domain_restore start: p2m_size = 7ff00
[2009-05-07 07:27:53 xend 4071] INFO (XendCheckpoint:353) Reloading memory pages:   0%
[2009-05-07 07:28:29 xend 4071] INFO (XendCheckpoint:353) Received all pages (0 races)
[2009-05-07 07:28:29 xend 4071] INFO (XendCheckpoint:353) ^H^H^H^H100%
[2009-05-07 07:28:29 xend 4071] INFO (XendCheckpoint:353) Memory reloaded (267221 pages)
[2009-05-07 07:28:29 xend 4071] INFO (XendCheckpoint:353) ERROR Internal error: User PT base is bad. pfn=490978 nr=524032 type=00000000 40000000
[2009-05-07 07:28:30 xend 4071] INFO (XendCheckpoint:353) Restore exit with rc=1
[2009-05-07 07:28:30 xend.XendDomainInfo 4071] DEBUG (XendDomainInfo:1905) XendDomainInfo.destroy: domid=45
[2009-05-07 07:28:30 xend.XendDomainInfo 4071] ERROR (XendDomainInfo:1915) XendDomainInfo.destroy: xc.domain_destroy failed.
Comment 1 Chris Lalancette 2009-05-07 12:26:05 UTC 
OK.  It looks like this is actually a hypervisor bug, and should be already fixed in the upstream Xen HV.  This is also a problem in the RHEL-5 HV, which is being tracked in 494876.  I'll close this as a dup of that.

Chris Lalancette

*** This bug has been marked as a duplicate of bug 494876 ***