Bug 1250798
| Summary: | Boot guest with virtio-blk data-plane, do "drive-mirror", guest cannot shutdown and qemu-kvm hang. | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | huiqingding <huding> |
| Component: | qemu-kvm-rhev | Assignee: | Stefan Hajnoczi <stefanha> |
| Status: | CLOSED DUPLICATE | QA Contact: | Virtualization Bugs <virt-bugs> |
| Severity: | high | Docs Contact: | |
| Priority: | medium | ||
| Version: | 7.2 | CC: | huding, juzhang, knoel, stefanha, virt-maint, xfu, yama |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2016-06-21 13:53:04 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: | |||
Remove virtio-blk data-plane and boot the guest: /usr/libexec/qemu-kvm -name rhel7 -S -machine pc-i440fx-rhel7.2.0,accel=kvm,usb=off -m 4096 -cpu SandyBridge -realtime mlock=on -sandbox off -smp 4,maxcpus=4,sockets=4,cores=1,threads=1 -drive file=/home/rhel7.2.qcow2,if=none,id=data-disk1,format=qcow2,cache=none,aio=native,werror=stop,rerror=stop -device virtio-blk-pci,drive=data-disk1,bus=pci.0,addr=0x6,id=data-disk1 -drive file=/home/data-disk.qcow2,if=none,id=data-disk2,format=qcow2,cache=none,aio=native,werror=stop,rerror=stop -device virtio-blk-pci,drive=data-disk2,bus=pci.0,addr=0x7,id=data-disk2 -netdev tap,id=hostnet0,vhost=on,script=/etc/ovs-ifup,downscript=/etc/ovs-ifdown -device virtio-net-pci,netdev=hostnet0,id=virtio-net-pci0,mac=b6:72:66:f5:7d:93,bus=pci.0,addr=0x9 -device sga -spice port=5910,password=redhat-vga,disable-ticketing -vga qxl -global qxl-vga.ram_size=67108864 -global qxl-vga.vram_size=67108864 -qmp tcp:0:4466,server,nowait -serial unix:/tmp/ttym,server,nowait -monitor stdio Do drive-mirror and shutdown guest same as step2 and step3 in comment #0, the guest can shutdown and qemu-kvm can quit normally. Looks like a bdrv_set_aio_context() or bdrv_drain_all() issue. Deferring to RHEL 7.2 since the scenario to trigger it doesn't appear critical enough for an exception. This bug has the same root cause as bz#1265179. I have posted a backport for that bug. *** This bug has been marked as a duplicate of bug 1265179 *** |
Description of problem: Boot guest with virtio-blk data-plane, do "drive-mirror", guest cannot shutdown and qemu-kvm hang. Version-Release number of selected component (if applicable): kernel-3.10.0-302.el7.x86_64 qemu-kvm-rhev-2.3.0-15.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1. boot a guest with virtio-blk data-plane # /usr/libexec/qemu-kvm -name rhel7 -S -machine pc-i440fx-rhel7.2.0,accel=kvm,usb=off -m 4096 -cpu SandyBridge -realtime mlock=on -sandbox off -smp 4,maxcpus=4,sockets=4,cores=1,threads=1 -object iothread,id=iothread0 -drive file=/home/rhel7.2.qcow2,if=none,id=data-disk1,format=qcow2,cache=none,aio=native,werror=stop,rerror=stop -device virtio-blk-pci,drive=data-disk1,iothread=iothread0,bus=pci.0,addr=0x6,id=data-disk1 -drive file=/home/data-disk.qcow2,if=none,id=data-disk2,format=qcow2,cache=none,aio=native,werror=stop,rerror=stop -device virtio-blk-pci,drive=data-disk2,iothread=iothread0,bus=pci.0,addr=0x7,id=data-disk2 -netdev tap,id=hostnet0,vhost=on,script=/etc/ovs-ifup,downscript=/etc/ovs-ifdown -device virtio-net-pci,netdev=hostnet0,id=virtio-net-pci0,mac=b6:72:66:f5:7d:93,bus=pci.0,addr=0x9 -device sga -spice port=5910,password=redhat-vga,disable-ticketing -vga qxl -global qxl-vga.ram_size=67108864 -global qxl-vga.vram_size=67108864 -qmp tcp:0:4466,server,nowait -serial unix:/tmp/ttym,server,nowait -monitor stdio 2. do drive-mirror {"execute":"qmp_capabilities"} {"return": {}} { "execute": "drive-mirror", "arguments": { "device": "data-disk2", "target": "/root/sn1", "format": "qcow2", "sync": "full"}} {"return": {}} 3. inside guest, do shutdown # shutdown -h now Actual results: after step2, "drive-mirror" can return without error info after step3, guest cannot shutdown and qemu-kvm hang. Expected results: after step3, guest can shutdown and qemu-kvm can quit without error info. Additional info: On host, check the serial console: # nc -U /tmp/ttym Red Hat Enterprise Linux Server 7.2 Beta (Maipo) Kernel 3.10.0-302.el7.x86_64 on an x86_64 dhcp-9-29 login: Powering off. [ 90.737329] Power down.