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Bug 1430258

Summary: fails to start a VM: unable to execute QEMU command 'query-iothreads': The command query-iothreads has not been found
Product: Red Hat Enterprise Linux 7 Reporter: Pino Toscano <ptoscano>
Component: libvirtAssignee: Pavel Hrdina <phrdina>
Status: CLOSED ERRATA QA Contact: lijuan men <lmen>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 7.4CC: dyuan, kuwei, lhuang, mmarhefk, mxie, phrdina, rbalakri, rjones, tzheng, xuzhang, yisun
Target Milestone: rcKeywords: Regression
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: libvirt-3.1.0-2.el7 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2017-08-01 17:24:15 UTC Type: Bug
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: 910269    
Attachments:
Description Flags
full debug log of libguestfs-test-tool none

Description Pino Toscano 2017-03-08 08:27:58 UTC 
Description of problem:
When trying to use libguestfs with libvirt 3.1.0, the appliance cannot be started using the libvirt backend:

libguestfs: error: could not create appliance through libvirt.

Try running qemu directly without libvirt using this environment variable:
export LIBGUESTFS_BACKEND=direct

Original error from libvirt: internal error: unable to execute QEMU command 'query-iothreads': The command query-iothreads has not been found [code=1 int1=-1]

Most probably libvirt assumes a too new QEMU is available, while only 1.5 is around.

Version-Release number of selected component (if applicable):
libvirt-client-3.1.0-1.el7.x86_64
libvirt-daemon-3.1.0-1.el7.x86_64
libvirt-daemon-config-network-3.1.0-1.el7.x86_64
libvirt-daemon-config-nwfilter-3.1.0-1.el7.x86_64
libvirt-daemon-driver-interface-3.1.0-1.el7.x86_64
libvirt-daemon-driver-network-3.1.0-1.el7.x86_64
libvirt-daemon-driver-nodedev-3.1.0-1.el7.x86_64
libvirt-daemon-driver-nwfilter-3.1.0-1.el7.x86_64
libvirt-daemon-driver-qemu-3.1.0-1.el7.x86_64
libvirt-daemon-driver-secret-3.1.0-1.el7.x86_64
libvirt-daemon-driver-storage-3.1.0-1.el7.x86_64
libvirt-daemon-driver-storage-core-3.1.0-1.el7.x86_64
libvirt-daemon-driver-storage-disk-3.1.0-1.el7.x86_64
libvirt-daemon-driver-storage-gluster-3.1.0-1.el7.x86_64
libvirt-daemon-driver-storage-iscsi-3.1.0-1.el7.x86_64
libvirt-daemon-driver-storage-logical-3.1.0-1.el7.x86_64
libvirt-daemon-driver-storage-mpath-3.1.0-1.el7.x86_64
libvirt-daemon-driver-storage-rbd-3.1.0-1.el7.x86_64
libvirt-daemon-driver-storage-scsi-3.1.0-1.el7.x86_64
libvirt-daemon-kvm-3.1.0-1.el7.x86_64
libvirt-devel-3.1.0-1.el7.x86_64
libvirt-docs-3.1.0-1.el7.x86_64
libvirt-libs-3.1.0-1.el7.x86_64
qemu-img-1.5.3-132.el7.x86_64
qemu-kvm-1.5.3-132.el7.x86_64
qemu-kvm-common-1.5.3-132.el7.x86_64

How reproducible:
100% with libvirt 3.1.0.

Steps to Reproduce:
1. Make sure libvirt >= 3.1.0 is available
2. Try to run libguestfs, for example libguestfs-test-tool

Additional info:
This is a regression, since it used to work until libvirt 3.0.0.
Comment 1 Pino Toscano 2017-03-08 08:36:47 UTC 
Created attachment 1261134 [details]
full debug log of libguestfs-test-tool
Comment 2 Pino Toscano 2017-03-08 09:46:42 UTC 
Reproducer without libguestfs:

$ [get a e.g. CentOS guest installed, as centos.img]
$ virt-install --connect qemu:///system -n centos --memory 2048 --disk path=centos.img --network network=default --hvm --noreboot --import --os-variant centos7.0
[...]
$ virsh -c qemu:///system start --console centos
[...]
error: Failed to start domain centos
error: internal error: unable to execute QEMU command 'query-iothreads': The command query-iothreads has not been found
Comment 3 Pavel Hrdina 2017-03-08 09:53:47 UTC 
*** Bug 1430273 has been marked as a duplicate of this bug. ***
Comment 4 Pino Toscano 2017-03-08 10:52:36 UTC 
*** Bug 1430214 has been marked as a duplicate of this bug. ***
Comment 6 Pavel Hrdina 2017-03-08 11:25:35 UTC 
Upstream commit:

commit bb0bffb16c2afe976802aae2059c27fdd0845b2f
Author: Pavel Hrdina <phrdina>
Date:   Wed Mar 8 10:45:10 2017 +0100

    qemu_process: don't probe iothreads if it's not supported by QEMU
Comment 9 lijuan men 2017-04-12 08:44:44 UTC 
verify the bug

version:
libvirt-3.2.0-2.el7.x86_64
qemu-kvm-rhev-2.8.0-6.el7.x86_64


steps:
1.ensure libvirtd is active
[root@localhost ~]# systemctl status libvirtd
● libvirtd.service - Virtualization daemon
   Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; enabled; vendor preset: enabled)
   Active: active (running) since Wed 2017-04-12 04:40:22 EDT; 10s ago
     Docs: man:libvirtd(8)
           http://libvirt.org

2.start libguestfs-test-tool
[root@localhost ~]# libguestfs-test-tool

no error
Comment 10 errata-xmlrpc 2017-08-01 17:24:15 UTC 
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://access.redhat.com/errata/RHEA-2017:1846
Comment 11 errata-xmlrpc 2017-08-02 00:03:43 UTC 
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://access.redhat.com/errata/RHEA-2017:1846