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description of problem:
For network and bridge, libvirt will report 'out of memory'
when set a negative value for queues.
Version-Release number of selected component (if applicable):
libvirt-1.2.8-1.el7.x86_64
qemu-kvm-rhev-2.1.0-3.el7.x86_64
How reproducible:
100%
Steps to Reproduce:
1. add following to guest xml
# virsh edit r7
<interface type='network'>
<source network='default'/>
<model type='virtio'/>
<driver name='vhost' queues='-9'/>
</interface>
2. start it
# virsh start r7
error: Failed to start domain r7
error: out of memory
# virsh dumpxml r7 | grep vhost
<driver name='vhost' queues='4294967287'/>
Expect result:
in step 1:
# virsh edit rhel7.0
error: 'queues' attribute must be positive number: -9
Failed. Try again? [y,n,f,?]:
Additional info:
it's ok in libvirt-1.1.1-29.el7.x86_64
Fixed upstream:
commit ca331a6af40fabe94ccee7bc7996a3fd8b5206c3
Author: Erik Skultety <eskultet>
Date: Mon Sep 15 09:33:22 2014 +0200
network: check negative values in bridge queues
We already are checking for negative value, reporting an error, but
using wrong function and the check only succeeds when a value that
cannot be converted to number successfully is encountered. This patch
provides just a minor change in call of the right version
of function virStrToLong.
v1.2.8-154-gca331a6
Verify it as follows. The result is expected. Move its status to VERIFIED.
# rpm -q libvirt
libvirt-1.2.14-1.el7.x86_64
# virsh edit r7
.....
<interface type='network'>
<mac address='52:54:00:50:a4:a2'/>
<source network='default'/>
<model type='virtio'/>
<driver name='vhost' queues='-2'/>
</interface>
error: XML document failed to validate against schema: Unable to validate doc against /usr/share/libvirt/schemas/domain.rng
Extra element devices in interleave
Element domain failed to validate content
Failed. Try again? [y,n,i,f,?]:
y - yes, start editor again
n - no, throw away my changes
i - turn off validation and try to redefine again
f - force, try to redefine again
? - print this help
Failed. Try again? [y,n,i,f,?]:
error: 'queues' attribute must be positive number: -2
Failed. Try again? [y,n,f,?]:
error: 'queues' attribute must be positive number: -2
# virsh edit r7
......
<interface type='network'>
<mac address='52:54:00:50:a4:a2'/>
<source network='default'/>
<model type='virtio'/>
<driver name='vhost' queues='aa'/>
</interface>
error: XML document failed to validate against schema: Unable to validate doc against /usr/share/libvirt/schemas/domain.rng
Extra element devices in interleave
Element domain failed to validate content
Failed. Try again? [y,n,i,f,?]:
error: 'queues' attribute must be positive number: aa
Failed. Try again? [y,n,f,?]:
error: 'queues' attribute must be positive number: aa
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHBA-2015-2202.html
description of problem: For network and bridge, libvirt will report 'out of memory' when set a negative value for queues. Version-Release number of selected component (if applicable): libvirt-1.2.8-1.el7.x86_64 qemu-kvm-rhev-2.1.0-3.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1. add following to guest xml # virsh edit r7 <interface type='network'> <source network='default'/> <model type='virtio'/> <driver name='vhost' queues='-9'/> </interface> 2. start it # virsh start r7 error: Failed to start domain r7 error: out of memory # virsh dumpxml r7 | grep vhost <driver name='vhost' queues='4294967287'/> Expect result: in step 1: # virsh edit rhel7.0 error: 'queues' attribute must be positive number: -9 Failed. Try again? [y,n,f,?]: Additional info: it's ok in libvirt-1.1.1-29.el7.x86_64