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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 19:48:54 +0300
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> Date: Tue, 10 Oct 2017 19:30:11 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: emacs-devel@gnu.org
> 
> > From: Fabrice Popineau <fabrice.popineau@gmail.com>
> > Date: Tue, 10 Oct 2017 18:13:19 +0200
> > Cc: Emacs developers <emacs-devel@gnu.org>
> > 
> > (gdb) p stack_pos
> > $3 = {__max_align_ll = 0, __max_align_ld = 3.587554638101247699761989924457637e-4943}
> 
> What is &stack_pos, the address of stack_pos?  Is it properly aligned?

Also, this very snippet runs every time a non-main thread is run by
Emacs, and yet all of the 18 tests before this one succeeded for you.
What is different in this 19th test that it fails?