Red Hat Bugzilla – Bug 805423
[virtio-win][serial]Removing serial port leads guest hangs up while transferring data between host and guest
Last modified: 2013-02-21 05:38:18 EST
Description of problem:
The bug describes while transferring data from host to guest if user hot-unplug serial port,the guest hangs up
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.Boot up guest with the following CLI
/usr/libexec/qemu-kvm -m 4G -smp 4 -drive file=/home/win2k8-64-run.raw,if=none,id=drive-virtio0-0-0,format=raw,werror=ignore,rerror=ignore,cache=none -device virtio-blk-pci,drive=drive-virtio0-0-0,id=virti0-0-0,bootindex=1 -netdev tap,id=hostnet0,vhost=on,script=/etc/qemu-ifup -device e1000,netdev=hostnet0,id=net0,mac=02:06:10:94:a3:f8 -device virtio-serial-pci,id=virtio-serial0 -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=channel0,name=org.linux-kvm.port.0,id=port0 -chardev socket,id=channel0,host=127.0.0.1,port=12340,server,nowait -chardev socket,id=channel1,host=127.0.0.1,port=19000,server,nowait -uuid 9e6f04cf-2ad7-45aa-9333-2d2ee26570c6 -monitor stdio -drive file=/home/disk1.raw,if=none,id=drive-virtio0-0-1,format=raw,werror=ignore,rerror=ignore,cache=none -device virtio-blk-pci,drive=drive-virtio0-0-1,id=virti0-0-1 -device virtio-balloon-pci,id=balloon1 -qmp tcp:0:4444,server,nowait -spice port=5931,disable-ticketing -vga qxl
do_spice_init: starting 0.8.3
2.run the scripts on hosts - upatehost-vdsm-lite.py
do python upatehost-vdsm-lite.py
3.run the below scripts on CMD in windows guest
for %i in (1,2,3,4,5,6,7,8,9,10,11,12...) do c:\Python27\python.exe virtIoChannelread.py
Make sure the data was always transferring from host to guest and the content be printed also.
4.go to host side and execute "device_del port0" in monitor
Host side,(qemu) device_del port0
(qemu) qemu-kvm: virtio-serial-bus: Unexpected port id 1 for device virtio-seria
Guest side hung up
At least,the guest works well and friendly message should provided if needed.
Created attachment 571653 [details]
host side script
Created attachment 571660 [details]
Put the two files into c:\
Need to install python in guests and please get related setup from
Is this a regression?
QE can reproduce the issue with virtio-win-prewhql-01-23 and virtio-win-prewhql-01-16.
The scenario is from my random testing.Thanks.
Port removal is not officially supported. Moving to 6.4.
Still it might work in build 25. Please check.
Reproduce this bug on virtio-win-prewhql-25
Guest win7-64 bit
How reproducible: 40%
1.Start guest w/ virtio-serial-port
2.install rhev-agent in the guest and start service
3.on the host ,open the listening port
4.hotunplug the virtio-serial-port which used by rhev-agent service
5.hotplug the virtio-serial-port which unpluged in step4
In work, need to re-test in 2-3 weeks.
Please try again with the build 40. There were several related changes in the serial driver.
dengmin ,pls verify this bug with virtio-win-prewhql-build-40
Verified the bug via virtio-win-prewhql-0.1-41
Please refer to the steps of comment 0
1.error message in monitor is gone after deleting port during transferring data between host and guest
2.The guest doesn't hang and work correctly.
So the bug should be fixed,thanks.
Based on comment #14 ,move status to VERIFIED.
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.