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DescriptionAndrea Bolognani
2016-08-01 07:56:22 UTC
Calling the query-hotpluggable-cpus QMP command with the
pseries-rhel7.2.0 machine type causes QEMU to crash:
$ /usr/libexec/qemu-kvm -M pseries-rhel7.2.0 -qmp stdio
{"QMP": {"version": {"qemu": {"micro": 0, "minor": 6, "major": 2},
"package": " (qemu-kvm-rhev-2.6.0-17.el7)"}, "capabilities": []}}
VNC server running on '::1;5900'
{"execute": "qmp_capabilities"}
{"return": {}}
{"execute": "query-hotpluggable-cpus"}
Segmentation fault
The same doesn't happen when using the pseries-rhel7.3.0
machine type.
kernel-3.10.0-481.el7.ppc64
qemu-kvm-rhev-2.6.0-17.el7.ppc64
I've confirmed the same problem exists upstream (for pseries-2.6 and earlier machine types). I've sent an upstream patch, and will backport it once merged.
Reproduced the issue on old version:
Version-Release number of selected component (if applicable):
kernel-3.10.0-470.el7.ppc64le
qemu-kvm-rhev-2.6.0-17.el7.ppc64le
Steps to Reproduce:
1.Boot up a guest with command:
/usr/libexec/qemu-kvm \
-name test \
-M pseries-rhel7.2.0 \
-smp 1,maxcpus=3,sockets=1,cores=1,threads=1 \
-m 1024 \
-monitor stdio \
-vnc :20 \
-qmp tcp:0:4444,server,nowait \
-device virtio-scsi-pci,bus=pci.0 \
-device scsi-hd,id=scsi-hd0,drive=scsi-hd0-dr0,bootindex=0 \
-drive file=/root/RHEL-7.2.qcow2,if=none,id=scsi-hd0-dr0,format=qcow2,cache=none \
-device virtio-net-pci,netdev=net0,id=nic0,mac=52:54:00:c4:e7:84 \
-netdev tap,id=net0,script=/etc/qemu-ifup,downscript=/etc/qemu-ifdown,vhost=on \
2.check hotpluggable cpus in qmp:
{ "execute": "qmp_capabilities"}
{"return": {}}
{"execute": "query-hotpluggable-cpus"}
Connection closed by foreign host.
Actual results:
Guest crashs with "Segmentation fault" error
Verified the issue on the latest build:
Version-Release number of selected component (if applicable):
kernel-3.10.0-470.el7.ppc64le
qemu-kvm-rhev-2.6.0-20.el7.ppc64le
Steps to Reproduce:
1.The same steps as above
2.check hotpluggable cpus in qmp:
{ "execute": "qmp_capabilities"}
{"return": {}}
{"execute": "query-hotpluggable-cpus"}
{"error": {"class": "GenericError", "desc": "The feature 'query-hotpluggable-cpus' is not enabled"}}
Actual results:
guest runs normally ,and it return "The feature 'query-hotpluggable-cpus' is not enabled" after query hotpluggable cpus command.
Base on the above results ，the bug has been fixed.
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-2016-2673.html
Calling the query-hotpluggable-cpus QMP command with the pseries-rhel7.2.0 machine type causes QEMU to crash: $ /usr/libexec/qemu-kvm -M pseries-rhel7.2.0 -qmp stdio {"QMP": {"version": {"qemu": {"micro": 0, "minor": 6, "major": 2}, "package": " (qemu-kvm-rhev-2.6.0-17.el7)"}, "capabilities": []}} VNC server running on '::1;5900' {"execute": "qmp_capabilities"} {"return": {}} {"execute": "query-hotpluggable-cpus"} Segmentation fault The same doesn't happen when using the pseries-rhel7.3.0 machine type. kernel-3.10.0-481.el7.ppc64 qemu-kvm-rhev-2.6.0-17.el7.ppc64