Bug 671147

Summary:	xen 64-bit PV guests fail to save-restore with kernels >= -95
Product:	Red Hat Enterprise Linux 6	Reporter:	Andrew Jones <drjones>
Component:	kernel	Assignee:	Andrew Jones <drjones>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	high	Docs Contact:
Priority:	high
Version:	6.0	CC:	jzheng, mjenner, pbonzini, xen-maint
Target Milestone:	rc	Keywords:	Regression
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel-2.6.32-112.el6	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-05-23 20:38:14 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:	653816

Description Andrew Jones 2011-01-20 15:23:32 UTC

A patch to the scheduler

83cd4fe sched: Change nohz idle load balancing logic to push model

exposed a deadlock in xen code that was fixed with

4877c73 xen: Do not suspend IPI IRQs.

That patch relies on 

ba461f0 powerpc: Use IRQF_NO_SUSPEND not IRQF_TIMER for non-timer interrupts
2dd9320 ixp4xx-beeper: Use IRQF_NO_SUSPEND not IRQF_TIMER for non-timer interrupt
685fd0b irq: Add new IRQ flag IRQF_NO_SUSPEND

and enables

6903591 xen: events: do not unmask event channels on resume

backport those 5 patches.

Comment 1 RHEL Program Management 2011-01-20 16:10:45 UTC

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.

Comment 3 Aristeu Rozanski 2011-02-03 16:46:51 UTC

Patch(es) available on kernel-2.6.32-112.el6

Comment 7 Jinxin Zheng 2011-04-06 10:21:48 UTC

I can reproduce this on kernel -96. Saving the 64-bit pv domU via xm save leads to endless wait and can only be killed by xm destroy.

With kernel -128 the guest could be successfully saved and restored. I'm moving this to VERIFIED.

Comment 8 errata-xmlrpc 2011-05-23 20:38:14 UTC

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