Bug 14162 - XKB Configuration Causing Segfaults In the X Server
Summary: XKB Configuration Causing Segfaults In the X Server
Alias: None
Product: xorg
Classification: Unclassified
Component: Server/General (show other bugs)
Version: git
Hardware: Other All
: medium normal
Assignee: Xorg Project Team
QA Contact: Xorg Project Team
URL: http://bugs.debian.org/cgi-bin/bugrep...
: 15250 (view as bug list)
Depends on:
Blocks: xorg-7.4
  Show dependency treegraph
Reported: 2008-01-20 15:48 UTC by David Nusinow
Modified: 2008-04-21 23:32 UTC (History)
5 users (show)

See Also:
i915 platform:
i915 features:


Description David Nusinow 2008-01-20 15:48:23 UTC
As reported by Matthias Berndt in the Debian bug tracker, XKB appears to be causing segfaults in the X server. The version of the server he's using is from the 1.4.1 branch, along with the recent security fixes. As mentioned in the bug report, when he regenerated a new config file that's more minimal, he no longer got segfaults. A backtrace is attached to the original bug.
Comment 1 Julien Cristau 2008-01-21 05:28:53 UTC
According to the reporter this started happening with the server-1.4-branch snapshot from 20080118, and didn't happen with the one from 20080105.  The only xkb-related change between both versions seems to be 8a3acd3ec41b887b4aeaa0b2932265522c1e2836.
Comment 2 Brice Goglin 2008-01-22 02:02:52 UTC
FWIW, I've also seen 2 users with problems like this until they remove XkbModel "latitude" from their xorg.conf.
Comment 3 Brice Goglin 2008-01-29 21:53:05 UTC
Ken Bloom reported a similar backtrace in Debian bug #463194. He was doing

  setxkbmap -I$HOME \
     -layout us,.hebrew \
     -option grp:toggle,grp_led:scroll \
  -print | xkbcomp -I$HOME - :0

with .hebrew file available at http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=5;filename=.hebrew;att=2;bug=463194
Comment 4 Brice Goglin 2008-02-12 13:03:10 UTC
Could this be fixed by 7018f280406eb0ef899a4046de274cfdd582881b ?

author  Peter Hutterer <peter@cs.unisa.edu.au>
        Thu, 7 Feb 2008 05:18:04 +0000 (15:18 +1030)

xkb: when copying the keymap, make sure the structs default to 0/NULL.

It actually does help if a pointer is NULL rather than pointing to nirvana
when you're trying to free it lateron. Who would have thought?
Comment 5 Jan de Groot 2008-03-23 05:57:40 UTC
That commit fixes the crashes completely here.
Comment 6 Timo Aaltonen 2008-04-21 23:32:40 UTC
*** Bug 15250 has been marked as a duplicate of this bug. ***

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