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DescriptionAlex Williamson
2011-02-04 20:24:54 UTC
Description of problem:
intel-iommu has a double lock fixed in 00dfff77
Version-Release number of selected component (if applicable):
kernel-2.6.32-113.el6
How reproducible:
no hit in practice
Steps to Reproduce:
1.
2.
3.
Actual results:
Expected results:
Additional info:
For reproducibility, I should say I've never hit it, but according to the
commit log, it is possible:
commit 00dfff77e7184140dc45724c7232e99302f6bf97
Author: Jiri Slaby <jirislaby>
Date: Mon Jun 14 17:17:32 2010 +0200
intel-iommu: Fix double lock in get_domain_for_dev()
stanse found the following double lock.
In get_domain_for_dev:
spin_lock_irqsave(&device_domain_lock, flags);
domain_exit(domain);
domain_remove_dev_info(domain);
spin_lock_irqsave(&device_domain_lock, flags);
spin_unlock_irqrestore(&device_domain_lock, flags);
spin_unlock_irqrestore(&device_domain_lock, flags);
This happens when the domain is created by another CPU at the same time
as this function is creating one, and the other CPU wins the race to
attach it to the device in question, so we have to destroy our own
newly-created one.
Signed-off-by: David Woodhouse <David.Woodhouse>
Comment 2RHEL Program Management
2011-02-06 07:50:31 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.
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