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To:	cygwin AT cygwin DOT com
From:	Gilles Detillieux <grdetil AT scrc DOT umanitoba DOT ca>
Subject:	libharfbuzz0 1.7.6-1 update causing xwin-xdg-menu.exe to crash
Message-ID:	<30aa068b-574f-8770-d8f3-eb037c038709@scrc.umanitoba.ca>
Date:	Thu, 19 Apr 2018 16:15:15 -0500
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MIME-Version:	1.0

Has anybody else run into this problem? I've done two installations of 
Cygwin/X on Windows 10 systems this week, and they both had problems 
with the XWin Server dying just a few seconds after starting up. I 
traced the problem back to xwin-xdg-menu.exe getting a Segmentation 
fault, which then causes XWin Server to exit. I hacked an alternate 
.startxwinrc file to prevent XWin Server from dying (it ends with a 
"sleep infinity"), so I could debug it further.

With the XWin Server running reliably, I then ran "strace 
xwin-xdg-menu.exe" and saw that it got a segmentation fault just after 
reading a TTF font from the Windows Font directory (bahnschrift.ttf if 
it matters). I noticed there were two recent library updates related to 
font handling, so I tried back out to the previous version for each. It 
turns out that when I reverted to version 1.7.4-1 of libharfbuzz0, 
xwin-xdg-menu.exe stopped crashing.

If it matters, both these systems are the Fall Creator's Update (1709) 
of Windows 10 64-bit, and I'm running the 32-bit version of Cygwin.

Hopefully someone can track down and fix this recent bug!

Thanks,
Gilles

-- 
Gilles R. Detillieux              E-mail: <grdetil AT scrc DOT umanitoba DOT ca>
Spinal Cord Research Centre       WWW:    http://www.scrc.umanitoba.ca/
Dept. of Physiology and Pathophysiology, Rady Faculty of Health Sciences,
Univ. of Manitoba  Winnipeg, MB  R3E 0J9  (Canada)


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