Bug 1410200
| Summary: | qemu gets SIGSEGV when hot-plug a vhostuser network | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | Marcel Kolaja <mkolaja> |
| Component: | qemu-kvm-rhev | Assignee: | Virtualization Maintenance <virt-maint> |
| Status: | CLOSED ERRATA | QA Contact: | Pei Zhang <pezhang> |
| Severity: | high | Docs Contact: | |
| Priority: | high | ||
| Version: | 7.3 | CC: | chayang, chhu, dyuan, fjin, jdenemar, jherrman, jsuchane, juzhang, knoel, lhuang, marcandre.lureau, mrezanin, pezhang, snagar, virt-maint, weliao, xuzhang, yalzhang, zpeng |
| Target Milestone: | rc | Keywords: | ZStream |
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | qemu-kvm-rhev-2.6.0-28.el7_3.3 | Doc Type: | Bug Fix |
| Doc Text: |
Hot plugging a vhostuser network device to a guest virtual machine caused the QEMU emulator to terminate unexpectedly due to access to an uninitialized chardev structure. The handling of vhostuser was improved not to access this structure if it is not initialized. As a result, the vhostuser network device can be hot plugged successfully.
|
Story Points: | --- |
| Clone Of: | 1394140 | Environment: | |
| Last Closed: | 2017-01-17 20:11:23 UTC | Type: | --- |
| 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: | 1394140 | ||
| Bug Blocks: | |||
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Description
Marcel Kolaja
2017-01-04 18:29:37 UTC
Fix included in qemu-kvm-rhev-2.6.0-28.el7_3.3 ==Reproduce==
Versions:
3.10.0-514.6.1.el7.x86_64
qemu-kvm-rhev-2.6.0-28.el7_3.2.x86_64
Steps:
1. Boot guest
/usr/libexec/qemu-kvm \
-name guest=7.3 \
-machine pc \
-cpu SandyBridge \
-m 1024 \
-smp 2,sockets=2,cores=1,threads=1 \
-object memory-backend-file,id=ram-node0,prealloc=yes,mem-path=/dev/hugepages/libvirt/qemu,share=yes,size=1073741824 \
-numa node,nodeid=0,cpus=0-1,memdev=ram-node0 \
-drive file=/var/lib/libvirt/images/jeos-23-64-dpdk.qcow2,format=qcow2,if=none,id=drive-virtio-disk0 \
-device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x6,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 \
-monitor stdio \
-qmp tcp:0:5555,server,nowait
2. Do hotplug vhostuser by qmp, qemu core dump.
{"execute":"qmp_capabilities"}
{"return": {}}
{"execute": "chardev-add","arguments": {"id": "charnet2","backend": {"type": "socket","data": {"addr": {"type": "unix","data": {"path": "/var/run/openvswitch/vhost-user1"}},"wait": false,"server": false}}},"id": "libvirt-19"}
{"return": {}, "id": "libvirt-19"
{"execute": "netdev_add","arguments": {"type": "vhost-user","chardev": "charnet2","id": "hostnet2"},"id": "libvirt-20"}
Connection closed by foreign host.
(qemu) Segmentation fault
So this bug has been reproduced.
==Verification==
3.10.0-514.6.1.el7.x86_64
qemu-kvm-rhev-2.6.0-28.el7_3.3.x86_64
Steps:
1. Boot guest
2. Do hotplug vhostuser by qmp, success.
{"execute":"qmp_capabilities"}
{"return": {}}
{"execute": "chardev-add","arguments": {"id": "charnet2","backend": {"type": "socket","data": {"addr": {"type": "unix","data": {"path": "/var/run/openvswitch/vhost-user1"}},"wait": false,"server": false}}},"id": "libvirt-19"}
{"return": {}, "id": "libvirt-19"}
{"execute": "netdev_add","arguments": {"type": "vhost-user","chardev": "charnet2","id": "hostnet2"},"id": "libvirt-20"}
{"return": {}, "id": "libvirt-20"}
{"execute": "device_add", "arguments": { "driver": "virtio-net-pci", "netdev": "hostnet2", "id": "net2" } ,"id": "libvirt-21"}
{"return": {}, "id": "libvirt-21"}
In guest, the nic added is show.
# lspci | grep "Virtio network"
00:04.0 Ethernet controller: Red Hat, Inc Virtio network device
3. Do hot-unplug, nic can be removed and guest works well.
{"execute": "device_del", "arguments": { "id": "net2" } ,"id": "libvirt-21"}
{"return": {}, "id": "libvirt-21"}
{"execute": "netdev_del","arguments": {"id": "hostnet2"},"id": "libvirt-20"}
{"return": {}, "id": "libvirt-20"}
{"execute": "chardev-remove","arguments": {"id": "charnet2"},"id": "libvirt-19"}
{"return": {}, "id": "libvirt-19"}
In guest, the nic added is removed.
# lspci | grep "Virtio network"
(No output)
So this bug has been fixed well. Thanks.
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-2017-0115.html |