Bug 671147 - xen 64-bit PV guests fail to save-restore with kernels >= -95
Summary: xen 64-bit PV guests fail to save-restore with kernels >= -95
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: kernel
Version: 6.0
Hardware: All
OS: Linux
high
high
Target Milestone: rc
: ---
Assignee: Andrew Jones
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks: 653816
TreeView+ depends on / blocked
 
Reported: 2011-01-20 15:23 UTC by Andrew Jones
Modified: 2011-08-30 07:26 UTC (History)
4 users (show)

Fixed In Version: kernel-2.6.32-112.el6
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2011-05-23 20:38:14 UTC
Target Upstream Version:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2011:0542 0 normal SHIPPED_LIVE Important: Red Hat Enterprise Linux 6.1 kernel security, bug fix and enhancement update 2011-05-19 11:58:07 UTC

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
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