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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Emacs-26 threads problem [win64]
Date: Tue, 10 Oct 2017 09:25:45 +0300
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To: Fabrice Popineau <fabrice.popineau@gmail.com>
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> From: Fabrice Popineau <fabrice.popineau@gmail.com>
> Date: Mon, 9 Oct 2017 21:48:39 +0200
> 
> passed 18/28 threads-let-binding
> Segmentation fault
> 
> This is with the latest emacs-26 sources.

Doesn't segfault for me, so it could be something specific to the
64-bit build.  Can you attach a debugger, show the backtrace, and look
around to find the immediate reason for the segfault?