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Reply-To:	Brian DOT Inglis AT SystematicSw DOT ab DOT ca
Subject:	Re: libharfbuzz0 1.7.6-1 update causing xwin-xdg-menu.exe to crash
To:	cygwin AT cygwin DOT com
References:	<30aa068b-574f-8770-d8f3-eb037c038709 AT scrc DOT umanitoba DOT ca> <63a969f7-00eb-2067-7dbe-f141bfecbaae AT dronecode DOT org DOT uk>
From:	Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
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Date:	Mon, 14 May 2018 13:30:51 -0600
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On 2018-04-26 08:03, Jon Turney wrote:
> On 19/04/2018 22:15, Gilles Detillieux wrote:
>> 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 for reporting this.
> 
> I can reproduce this problem, but it only seems to occur with 32-bit cygwin.
> 
> (Obviously you also need a recent enough Windows 10 to have the Bahnschrift font)
> 
> The actual crash seems to be in fontconfig, e.g. 'fc-query
> /usr/share/fonts/microsoft/bahnschrift.ttf' fails in the same way.
> 
> I didn't get very far investigating the problem, as rebuilding the fontconfig
> package with the current toolchain seems to be enough to make the problem go away.

I haven't noticed any problems with Bahnschrift, but as it is a DE DIN 1451
Schrift (typeface), based on the original URW Fette Mittelschrift (bold
regular), Engschrift (condensed), Breitschrift (expanded), it could be
substituted by similar free fonts such as the Google Fonts Roboto family or SIL
OFL licensed equivalents.

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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