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Subject: Re: libharfbuzz0 1.7.6-1 update causing xwin-xdg-menu.exe to crash
To: The Cygwin Mailing List <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> <7a60e967-6861-5e5c-f0ee-5ebb6bf14e23 AT SystematicSw DOT ab DOT ca>
From: Jon Turney <jon DOT turney AT dronecode DOT org DOT uk>
Message-ID: <3a375be2-499f-1f40-8c90-7c91b8822e3e@dronecode.org.uk>
Date: Mon, 14 May 2018 22:44:50 +0100
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On 14/05/2018 20:30, Brian Inglis wrote:
> 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

Note that this problem only effects 32-bit Cygwin.

> 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.

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