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From Allen Riddle <>
Subject Re: Build hangs
Date Thu, 10 Nov 2011 04:27:05 GMT

That seems like it could be likely, but none of my code is spawning
processes.  However, when I run an strace on the process, I can see a child
process getting created (assuming this is from ant?), and the deadlock from
the full buffer could be happening there, though you would think this would
be handled.  One variance I thought of is the JVM version.  Locally I am
running Hotspot on OS X, but the deadlock occurs when running Open JDK on
Ubuntu and CentOS.  Thanks.

On Wed, Nov 9, 2011 at 10:02 AM, Alex Boisvert <>wrote:

> Wild guess:  if you are somehow exec()'ing a process, you need to read the
> stdout/stderr streams otherwise the child process will wait/hang until it
> output buffers are consumed. (only happens when outstanding output exceeds
> > X kilobytes)
> alex
> On Wed, Nov 9, 2011 at 4:48 PM, Allen Riddle <>
> wrote:
> > All,
> >
> > My build script periodically hangs on Linux systems.  The last message I
> > see on the log is "Trying to override old definition of datatype junit."
> >  This doesn't happen on OS X or Windows, but only in Ubuntu and CentOS.
>  I
> > did an strace on it the process and what I see is a child process is
> > getting created but nanosleep is repeatedly being called.  I don't see
> > anything my unit tests that could cause such an issue.  Any ideas?
>  Thanks.
> >

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