[libvirt] Application using libvirt crashes when having concurrent TLS connections (gnutls problem)

[Daniel P. Berrange]

On Fri, Oct 02, 2009 at 09:59:27PM +0200, Thomas Treutner wrote:
> Hi list,
> 
> I was wondering about the status of this bug:
> 
> 	https://bugzilla.redhat.com/show_bug.cgi?id=512367

Patch proposed but the original reporter never indicated whether it
actually fixed the problem or not. If someone can confirm ....

> 
> Is it correct that this is a bug in the libvirt client? I ran into this today, 
> as I've written a kind of a VM scheduler (ressource requirements, placement 
> etc.) in Java (libvirt-java 0.3.0, libvirt 0.6.5) and this is a show-stopper 
> for me right now. I had some troubles with the newest version of libvirt (it 
> couldn't connect to Xen IIRC), so I don't want to mess my setup again for 
> nothing.
> 
> What is actually causing this problem resp. in which situation is libvirt 
> broken? When a client uses more than one connection at the same time? Or when 
> a client uses more than one connection to the same server at the same time? 
> Are there any recommeded workarounds?

I believe the problem is when you use multiple different virConnectPtr
objects. If using one connection from multiple threads libvirt itself
would have provided sufficient locking.


Daniel
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