Comment 0 for bug 728672

Running my own build of the natty 'master-next' kernel branch (2.6.38-6.33 at SHA1-ID "5754cb"; based on linux 2.6.38-rc7), the default unity desktop session makes compiz crash immediately upon login (100% reproducible):

  compiz[1388]: segfault at 20 ip 00007ff0cee9702a sp 00007fffc50a9580 error 4 in i965_dri.so[7ff0cee6b000+ac000]

The crash does NOT occur when running the natty main kernel (2.6.38-5.32), so this appears to be a regression caused by the master-next branch.

Note that I the gnome-panel (classic) session works fine. Also, after unity/compiz crashes, I can then switch to a VT and launch gnome-panel and compiz manually... In that state, "unity --replace" does make the same crash occur immediately. (Effectively, only unity seems to provoke this compiz crash, and it always does so).

uname: Linux marconi 2.6.38-6-generic #33~kamal~57545cb (my build from master-next)
unity: Installed: 3.6.0-0ubuntu2 (from natty/main)
compiz: Installed: 1:0.9.4-0ubuntu3 (from natty/main)
libgl1-mesa-dri: Installed: 7.10.1~git20110215.cc1636b6-0ubuntu2 (from natty/main)

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: libnux-0.9-0 0.9.30-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-6.33~username~57545cb-generic 2.6.38-rc7
Uname: Linux 2.6.38-6-generic x86_64
Architecture: amd64
Date: Thu Mar 3 11:36:56 2011
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20101214)
ProcCmdline: compiz
ProcCwd: /home/kamal
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7ff0cee9702a <intel_miptree_image_copy+42>: cmpb $0x0,0x20(%rsi)
 PC (0x7ff0cee9702a) ok
 source "$0x0" ok
 destination "0x20(%rsi)" (0x00000020) not located in a known VMA region (needed writable region)!
SegvReason: writing NULL VMA
Signal: 11
SourcePackage: nux
StacktraceTop:
 intel_miptree_image_copy () from /usr/lib/dri/i965_dri.so
 intel_finalize_mipmap_tree () from /usr/lib/dri/i965_dri.so
 brw_validate_textures () from /usr/lib/dri/i965_dri.so
 brw_draw_prims () from /usr/lib/dri/i965_dri.so
 ?? () from /usr/lib/dri/libdricore.so
Title: compiz crashed with SIGSEGV in intel_miptree_image_copy()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare