Bug 1362019
| Summary: | Crashes when using query-hotpluggable-cpus with pseries-rhel7.2.0 machine type | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | Andrea Bolognani <abologna> |
| Component: | qemu-kvm-rhev | Assignee: | David Gibson <dgibson> |
| Status: | CLOSED ERRATA | QA Contact: | Virtualization Bugs <virt-bugs> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 7.3 | CC: | knoel, mrezanin, qzhang, virt-maint, xuhan, xuma |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | ppc64le | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | qemu-kvm-rhev-2.6.0-20.el7 | Doc Type: | If docs needed, set a value |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2016-11-07 21:27:49 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: | 1288337 | ||
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. A fix for the upstream version of this problem is now merged upstream. I've brewed a downstream fix at:
https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=11523275
Fix included in qemu-kvm-rhev-2.6.0-20.el7 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