Re: kern/49862 (drm-induced kernel panic)

[Taylor R Campbell <riastradh%NetBSD.org@localhost>]

   Date: Tue, 28 Jul 2015 10:40:31 +0200
   From: Thomas Klausner <wiz%NetBSD.org@localhost>

   More details:
   The splash screen appears and gets to about 30 percent, then disappears.
   Before the patch, after the splash screen finishes its progress bar,
   the documents open, instead I get a core dump:

   wiz@yt:~> gdb /usr/pkg/libreoffice4-4.4.4.3/program/soffice.bin soffice.bin.core
   [...]
   (gdb) bt
   #0  0x00007f7fe3c18eb9 in FcPatternObjectPosition () from /usr/pkg/lib/libfontconfig.so.1
   #1  0x00007f7fe3c194aa in FcPatternObjectFindElt () from /usr/pkg/lib/libfontconfig.so.1

Doesn't really look like a kernel or X bug to me -- looks like a
vanilla bug in fontconfig, unless FcPatternObjectPosition is working
on a graphics buffer or something.

I don't suppose you can rebuild with debug symbols and try again, can
you?