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Re: libharfbuzz0 1.7.6-1 update causing xwin-xdg-menu.exe to crash
- From: Gilles Detillieux <grdetil at scrc dot umanitoba dot ca>
- To: cygwin at cygwin dot com
- Date: Tue, 24 Apr 2018 16:30:01 -0500
- Subject: Re: libharfbuzz0 1.7.6-1 update causing xwin-xdg-menu.exe to crash
- References: <email@example.com>
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!
Gilles R. Detillieux E-mail: <firstname.lastname@example.org>
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)
Problem reports: http://cygwin.com/problems.html
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