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From: Hleb Valoshka <375gnu@gmail.com>
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Subject: Re: Concurrency issue in TestKgioUnixConnect?
Date: Tue, 3 Sep 2013 11:50:12 +0300
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On 9/3/13, Eric Wong <normalperson@yhbt.net> wrote:
> I just signed-off and pushed the following out:
>
> Hleb Valoshka (2):
>       Change prefix of temporary sockets to prevent races
>       Don't dump 20M in case of failure
>
> I've never been hit by the issue even though I've always known it's a
> potential issue on very busy systems.  It looks like Tempfile embeds the

I was able to reproduce it only one or two times in virtualized GNU/kFreeBSD.

> PID in the temporary name, so maybe the buildds are recycling PIDs very
> quickly?

I think the problem is caused by parallel tests invocation in ruby 1.9
(ruby 1.8 is
never affected by this issue). Tempfile builds file name using prefix,
PID and random
value, in rare cases this random value isn't random enough.

> I haven't looked closely at your fakeroot workaround.

It's a Debian specific patch.