[libvirt-users] serial console locking for a domain (concurrent access = garbled output)

[Dusty Mabe]

Ahh... Thank you Eric. That does look like the same issue. I had
searched through the open bugs here
https://bugzilla.redhat.com/buglist.cgi?component=libvirt&product=Red%20Hat%20Enterprise%20Linux%206
but it looks like 729940 is not view-able to the public (at least I
don't have permission to view it).

Thank you for the pointer!

Dusty Mabe


On Tue, May 1, 2012 at 3:12 PM, Eric Blake <eblake at redhat.com> wrote:
> On 05/01/2012 12:51 PM, Dusty Mabe wrote:
>> Hi,
>>
>> I am seeing an issue in libvirt-0.9.4-23.el6_2.7.x86_64.rpm where my
>> virsh console output for a domain gets garbled because I have
>> virt-manager running and it is also trying to access the serial device
>> for the guest domain. Basically there is concurrent serial access and
>> half the text ends up on one end while the rest ends up on the other
>> end.
>
> Sounds like you are running into the issue that was fixed for 0.9.11
> with this patch:
>
> commit 4716138229ae47c5492c13a8622b779889560fd7
> Author: Peter Krempa <pkrempa at redhat.com>
> Date:   Thu Oct 6 12:24:47 2011 +0200
>
>    qemu: Add ability to abort existing console while creating new one
>
>    This patch fixes console corruption, that happens if two concurrent
>    sessions are opened for a single console on a domain. Result of this
>    corruption was that each of the console streams recieved just a part
>    of the data written to the pipe so every console rendered unusable.
>
> and which is already present in the RHEL 6.3 beta build of libvirt,
> thanks to https://bugzilla.redhat.com/show_bug.cgi?id=729940.
>
> --
> Eric Blake   eblake at redhat.com    +1-919-301-3266
> Libvirt virtualization library http://libvirt.org
>