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X-HELO:	cliff.scrc.umanitoba.ca
Subject:	Re: libharfbuzz0 1.7.6-1 update causing xwin-xdg-menu.exe to crash
To:	Jon Turney <jon DOT turney AT dronecode DOT org DOT uk>,
	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> <45934aef-f59b-7ca6-5cf9-8e60ad559cae AT scrc DOT umanitoba DOT ca> <b907254e-fe2d-155d-aa3f-6cda50cd4be1 AT dronecode DOT org DOT uk>
From:	Gilles Detillieux <grdetil AT scrc DOT umanitoba DOT ca>
Message-ID:	<5ebcd9b9-c745-d468-5ecf-aae259bedf2a@scrc.umanitoba.ca>
Date:	Mon, 14 May 2018 12:05:13 -0500
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In-Reply-To:	<b907254e-fe2d-155d-aa3f-6cda50cd4be1@dronecode.org.uk>

Thanks, Jon. The local.conf blacklist rule worked like a charm!

It's odd that the fontconfig packages appear not to have been built with 
the latest stable gcc release, but so long as it's just this one 
(unneeded) font that's causing the headaches I'll just keep blacklisting 
it on our systems.

On 2018-05-12 09:23, Jon Turney wrote:
> On 26/04/2018 16:40, Gilles Detillieux wrote:
>> On 2018-04-26 09:03, 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.
>
> Another possible workaround seems to be to blacklist this particular 
> font, e.g.:
>
> create a /etc/fonts/conf.d/local.conf containing:
>
> <selectfont>
>     <rejectfont>
> <glob>/usr/share/fonts/microsoft/bahnschrift.ttf</glob>
>     </rejectfont>
> </selectfont>
>
>>> 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.
>>
>> Thanks for the follow-up and narrowing down the problem, Jon. 
>> Interesting that rebuilding fontconfig clears up the issue. Although, 
>> if it's a memory corruption issue, it could just be that the new 
>> toolchain lays things out differently enough that the bug doesn't 
>> manifest itself the same way. It could also be that the new gcc fixes 
>> a compiler or optimizer bug that led to the problem. Perhaps you and 
>> Yaakov could touch base on which toolchain versions you're using and 
>> see if an update to his toolchain may be in order.
>>
>> Are you using the test version of gcc (7.3.0-1) announced April 11, 
>> or the older release. I've got gcc-core-6.4.0-5 on mine, which I 
>> assume is the latest stable release.
>
> The latest stable release, 6.4.0-5.
>

-- 
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, Faculty of Health Sciences,
Univ. of Manitoba  Winnipeg, MB  R3E 0J9  (Canada)


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