[libvirt] Easy reproducer for multiple races and segfaults in libvirtd

[Daniel P. Berrange]

On Fri, Nov 16, 2012 at 02:48:03PM +0000, Richard W.M. Jones wrote:
> On Fri, Nov 16, 2012 at 02:40:31PM +0000, Daniel P. Berrange wrote:
> > On Fri, Nov 16, 2012 at 02:16:04PM +0000, Richard W.M. Jones wrote:
> > > 
> > > You need to read the instructions at the top, and download the
> > > following appliance too:
> > > 
> > > http://libguestfs.org/download/binaries/appliance/appliance-1.18.9.tar.xz
> > > 
> > > So far I've filed the following bugs:
> > > 
> > > https://bugzilla.redhat.com/show_bug.cgi?id=875741
> > > https://bugzilla.redhat.com/show_bug.cgi?id=877110
> > > https://bugzilla.redhat.com/show_bug.cgi?id=877312
> > > https://bugzilla.redhat.com/show_bug.cgi?id=877429
> > > https://bugzilla.redhat.com/show_bug.cgi?id=877430
> > 
> > Thanks for the reproducer program, that should make life much easier.
> > 
> > Just to confirm, you're seeing these problems on both 1.0.0 and
> > current GIT master ?
> 
> Actually I'm testing libvirt-0.10.2.1-2.fc18.x86_64 & libvirt from
> git, and seeing roughly the same set of problems with both.  Didn't
> try 1.0.0 at all.
> 
> To use libvirt from git, I'm doing:
> 
>   killall libvirtd lt-libvirtd
>   ~/d/libvirt/run ./test-parallel 
> 
> Plus I should note a few things about my environment:
> 
>  - Fedora 18
> 
>  - 16 GB of RAM (if you don't have that, reduce NR_THREADS in the test)
> 
>  - baremetal with KVM on a very fast Intel Sandybridge
>    (I doubt this is reproducible in a VM)
> 
>  - I've configured core_pattern and ulimit to capture coredumps in /tmp

I've run the test on several machines, and finally found one which
would reproduce the "Operation is not valid" bug. I don't see any
of the other BZs you list above occurring.

At least i can now investigate what's gone wrong with 877430

Daniel
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