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.