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Date:	Fri, 14 Jun 2013 21:16:44 +0300
From:	Eli Zaretskii <eliz AT gnu DOT org>
Subject:	Re: bug#14569: 24.3.50; bootstrap fails on Cygwin
In-reply-to:	<51BB56CB.7030209@cs.ucla.edu>
To:	Paul Eggert <eggert AT cs DOT ucla DOT edu>
Cc:	cygwin AT cygwin DOT com, 14569 AT debbugs DOT gnu DOT org
Reply-to:	Eli Zaretskii <eliz AT gnu DOT org>
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References:	<b4m61xqu654 DOT fsf AT jpl DOT org> <51B5DA82 DOT 4010703 AT alice DOT it> <3EC77598-24B8-42DD-8983-5069E64AAB60 AT swipnet DOT se> <51B62175 DOT 10307 AT alice DOT it> <06F80BBC-D7CD-4E6C-97AD-EB8E476E2FC0 AT swipnet DOT se> <83sj0olh38 DOT fsf AT gnu DOT org> <51B7717D DOT 6060702 AT cs DOT ucla DOT edu> <51B77A00 DOT 2060908 AT cornell DOT edu> <83mwqwl903 DOT fsf AT gnu DOT org> <51B78346 DOT 3050600 AT cornell DOT edu> <FA9D25B7-3D1F-40CC-AA6E-5347E8112CA4 AT swipnet DOT se> <E143AC75-8C2B-4A59-81F6-571B9D4EEF13 AT swipnet DOT se> <2E06A322-530C-4AA2-9282-6D2E48B1D194 AT swipnet DOT se> <51B8BEFE DOT 6070309 AT cs DOT ucla DOT edu> <51B8D5ED DOT 1010407 AT alice DOT it> <C679A2B2-0264-4DDA-B900-5B90BE7CF1E9 AT swipnet DOT se> <51BA03CA DOT 4080804 AT cs DOT ucla DOT edu> <BEC82502-E9FD-4F8E-B91E-F680F6885FB2 AT swipnet DOT se> <51BB56CB DOT 7030209 AT cs DOT ucla DOT edu>

> Date: Fri, 14 Jun 2013 10:45:47 -0700
> From: Paul Eggert <eggert AT cs DOT ucla DOT edu>
> Cc: 14569 AT debbugs DOT gnu DOT org
> 
> Cygwin developers, I'm worried about a Cygwin bug where
> pthread_kill may not send a signal to the correct thread.
> This bug may be causing Emacs to crash.  The Cygwin bug is
> discussed in this thread:
> 
> http://cygwin.com/ml/cygwin/2012-05/msg00472.html

Caveat: I'm not a Cygwin developer, and don't even use Cygwin.

> Emacs uses pthread_kill to redirect
> SIGCHLD to the main thread; if this is sent to a random
> thread instead, that could explain the random crashes.

It should be easy to instrument deliver_child_signal so that it prints
something when it redirects SIGCHLD, and then the Cygwin users could
see if there's such a report immediately before the crash, or at all.

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