libharfbuzz0 1.7.6-1 update causing xwin-xdg-menu.exe to crash

[Gilles Detillieux]

I just ran into this bug on a third Windows 10 1709 64-bit system, only 
this time it was a little worse. Both xwin-xdg-menu.exe and xterm.exe 
would crash. An strace on xterm.exe showed the crash occurring after 
reading that same font, but it happened even when I reverted 
libharfbuzz0 to the 1.7.4-1 version. On this system, I also had to 
revert libfreetype6 from 2.8.1-1 to 2.6.5-1 to get xterm and 
xwin-xdg-menu to run reliably. Something in the font handling in these 
two libraries broke on a recent update.

On 04/19/2018 04:15 PM, 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,
> Gilles
>

-- 
Gilles R. Detillieux              E-mail: <grdetil@scrc.umanitoba.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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