[Bug 607071] Re: [SRU] X server segfaults when using XTest (xvfb)

[Marc Deslauriers]

SRU request:

Impact: certain uses of XTest cause a null pointer dereference,
rendering xpra unusable in Lucid.

This is fixed in the newer xorg-server version in Maverick. I've
prepared an SRU for lucid that adds the trivial upstream fix that
corrects the issue. See attached debdiff.


** Summary changed:

- X server segfaults when using XTest (xvfb)
+ [SRU] X server segfaults when using XTest (xvfb)

** Patch added: "debdiff for SRU"
   https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/607071/+attachment/1757470/+files/xorg-server_1.7.6-2ubuntu7.5.debdiff

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https://bugs.launchpad.net/bugs/607071

Title:
  [SRU] X server segfaults when using XTest (xvfb)

Status in “parti-all” package in Ubuntu:
  Invalid
Status in “xorg-server” package in Ubuntu:
  Fix Released
Status in “parti-all” source package in Lucid:
  Invalid
Status in “xorg-server” source package in Lucid:
  In Progress

Bug description:
  There is a bug in at least xorg-server 1.7.6 (as shipped in Lucid) where certain uses of XTest cause a null pointer dereference and the server crashes.

XTest probably isn't used much in general, but this causes very serious problems for 'xpra' -- basically it is unusable in Lucid (at least for me) because the X server keeps crashing under it. I would not be surprised if x11vnc had a similar problem.

(NB, I am the upstream for xpra.)

This bug has been fixed in upstream X.org, and I bisected the fix to this commit:
  http://cgit.freedesktop.org/xorg/xserver/commit/?id=af170a4ab76d33254dd4e54a33bb410fa1624739

This bug-fix commit has also been backported to the 1.7 stable tree, and is included in xorg-server 1.7.7:
  http://cgit.freedesktop.org/xorg/xserver/commit/?id=ad48184752970541aa153bf2961a2d7da1a910b5
and I have confirmed that xpra works with 1.7.7.

Please upgrade to 1.7.7, or apply this patch to your 1.7.6.

(This has been reported several times as a bug in xpra, see: http://code.google.com/p/partiwm/issues/detail?id=20)

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: xvfb 2:1.7.6-2ubuntu7.2
ProcVersionSignature: Ubuntu 2.6.32-23.37-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-23-generic i686
Architecture: i386
Date: Sun Jul 18 22:22:12 2010
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/usr/bin/zsh
SourcePackage: xorg-server