Buildsys deadlock?

[seth vidal]

On Wed, 2005-10-26 at 12:08 -0400, Dan Williams wrote:
> On Wed, 2005-10-26 at 15:55 +0200, Andreas Bierfert wrote:
> > Hi,
> > 
> > I enqueued 268-272 this morning (GMT+1) and while some are stuck at add_to_repo
> > others are still building (which they should have taken them like 2-3
> > minutes...).
> > 
> > Just before that 264-266 got through but I never got a mail from the buildsys...
> 
> Yup, it's mock stuck again reading from the child pipe of a defunct
> child.  We need to fix this...

what's causing the child's defunct pipe to die?

-sv