[libvirt] PATCH: Avoid crashing valgrind in LXC driver

[Daniel Veillard]

On Fri, Jan 30, 2009 at 11:41:16AM +0000, Daniel P. Berrange wrote:
> The LXC driver makes use of new clone flags for creating containers. It
> creates a dummy container which immediately exits in order to test for
> availabilty of this feature in the kernel. Unfortunately  valgrind has
> no knowledge of these new clone flags, gets very very unhappy and then
> reports bogus memory leaks, bogus illegal instructions, and then often
> SEGV's itself. Not cool. While obviously valgrind needs fixing, I looked
> at its code, and it doesn't seem easy, so this patch adds a quick check
> for a LD_PRELOAD  environemnt variable which contains a library whose
> name contains 'vgpreload'. If it sees this, LXC driver totally disables
> itself.  This lets me reliably valgrind the libvirtd daemon again.

  Okay, this is a workaround hack, I'm fine applying it but
we should log this somewhere (TODO ?) to think about cleaning
this up when valgrind get fixed.

Daniel

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