Bug 805423 - [virtio-win][serial]Removing serial port leads guest hangs up while transferring data between host and guest
Summary: [virtio-win][serial]Removing serial port leads guest hangs up while transfer...
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: virtio-win
Version: 6.3
Hardware: Unspecified
OS: Unspecified
Target Milestone: rc
: ---
Assignee: Yvugenfi@redhat.com
QA Contact: Virtualization Bugs
Depends On:
TreeView+ depends on / blocked
Reported: 2012-03-21 09:23 UTC by Min Deng
Modified: 2013-02-21 10:38 UTC (History)
12 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
In the previous version, port surprise removal handle has a bug, where it didn't stop and purge write and read queues. This leads to the situation when request were sending to already removed device. The problem was fixed by stopping and draining read and write queues on event of surprise removing.
Clone Of:
Last Closed: 2013-02-21 10:38:18 UTC
Target Upstream Version:

Attachments (Terms of Use)
host side script (791 bytes, application/octet-stream)
2012-03-21 09:25 UTC, Min Deng
no flags Details
Put the two files into c:\ (2.45 KB, application/zip)
2012-03-21 09:31 UTC, Min Deng
no flags Details

System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2013:0441 0 normal SHIPPED_LIVE virtio-win bug fix and enhancement update 2013-02-20 20:48:13 UTC

Description Min Deng 2012-03-21 09:23:27 UTC
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):
How reproducible:
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=,port=12340,server,nowait -chardev socket,id=channel1,host=,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
for ((;;))
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
Actual results:
Host side,(qemu) device_del port0
(qemu) qemu-kvm: virtio-serial-bus: Unexpected port id 1 for device virtio-seria
Guest side,
 Guest side hung up
Expected results:
At least,the guest works well and friendly message should provided if needed.

Additional info:

Comment 1 Min Deng 2012-03-21 09:25:18 UTC
Created attachment 571653 [details]
host side script

Comment 2 Min Deng 2012-03-21 09:31:39 UTC
Created attachment 571660 [details]
Put the two files into c:\

  Need to install python in guests and please get related setup from 

Comment 4 Ronen Hod 2012-03-22 06:17:03 UTC
Is this a regression?

Comment 5 Min Deng 2012-03-23 09:07:55 UTC
Hi Ronen,

   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.


Comment 6 Ronen Hod 2012-04-03 07:58:56 UTC
Hi Min,

Port removal is not officially supported. Moving to 6.4.
Still it might work in build 25. Please check.

Comment 7 Mike Cao 2012-05-07 07:36:55 UTC
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 

Actual Results:
Guest hang

Comment 9 Ronen Hod 2012-07-10 09:42:16 UTC
In work, need to re-test in 2-3 weeks.

Comment 12 Ronen Hod 2012-10-02 09:59:58 UTC

Please try again with the build 40. There were several related changes in the serial driver.

Thanks, Ronen.

Comment 13 Mike Cao 2012-10-08 01:05:25 UTC
dengmin ,pls verify this bug with virtio-win-prewhql-build-40


Comment 14 Min Deng 2012-10-15 06:36:54 UTC
Verified the bug via virtio-win-prewhql-0.1-41
Please refer to the steps of comment 0
Actual results,
  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.

Comment 16 Mike Cao 2012-10-30 07:38:17 UTC
Based on comment #14 ,move status to VERIFIED.

Comment 17 errata-xmlrpc 2013-02-21 10:38:18 UTC
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.


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