compiz crashed with SIGSEGV in get_radeon_bo()

[Miguel Branco]

after upgrade to 12.04 beta 1 from oneiric, compiz can crash randomly soon after login.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: libnux-2.0-0 2.4.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-17.27-generic 3.2.6
Uname: Linux 3.2.0-17-generic i686
ApportVersion: 1.94-0ubuntu1
Architecture: i386
CrashCounter: 1
Date: Sat Mar 3 11:57:40 2012
ExecutablePath: /usr/bin/compiz
ProcCmdline: compiz --replace
SegvAnalysis:
 Segfault happened at: 0x6326526: mov 0x10(%eax),%edx
 PC (0x06326526) ok
 source "0x10(%eax)" (0x00000010) not located in a known VMA region (needed readable region)!
 destination "%edx" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: nux
StacktraceTop:
 ?? () from /usr/lib/i386-linux-gnu/dri/r300_dri.so
 r300_flush () from /usr/lib/i386-linux-gnu/dri/r300_dri.so
 ?? () from /usr/lib/i386-linux-gnu/dri/r300_dri.so
 st_flush () from /usr/lib/i386-linux-gnu/dri/libgallium.so
 st_finish () from /usr/lib/i386-linux-gnu/dri/libgallium.so
Title: compiz crashed with SIGSEGV in r300_flush()
UpgradeStatus: Upgraded to precise on 2012-03-02 (0 days ago)
UserGroups: adm admin audio cdrom dialout dip disk floppy fuse lp lpadmin mythtv netdev plugdev powerdev sambashare scanner users video

[Apport retracing service (apport)]

StacktraceTop:
 get_radeon_bo (_buf=0x0) at radeon_drm_bo.c:91
 r300_flush (pipe=0x892b128, flags=2, fence=0xbfb53c1c) at r300_flush.c:86
 r300_flush_wrapped (pipe=0x892b128, fence=0xbfb53c1c) at r300_flush.c:137
 st_flush (st=0x89af490, fence=0xbfb53c1c) at state_tracker/st_cb_flush.c:92
 st_finish (st=0x89af490) at state_tracker/st_cb_flush.c:103

[Miguel Branco (mpbbranco)]

Just to add some feedback, despite the crash notification the session is not impaired and compiz continues working, I guess it is relaunched.
I wonder also if this is not related to the shortly garbled screen between the greeter login and the desktop bacgkround appearance. I doubt I'm alone at experiencing it, it seems so clearly a bug that I don't know if I need (and how) to describe it. So much for the "smooth" background transition from login to session. I'm assuming this typically will be ironed out for the RC.

[Will Cooke (willcooke)]

As part of the big bug clear up for 16.04 LTS I am marking this bug as Wont Fix.
These types of crasher are better handled by errors.ubutnu.com which can collate similar crash reports to help us identify persitent bugs rather than one-off crashes.
Sorry we are not able to help with this specific issue. If you are still experiencing this crash, please re-open the bug and add the tag "desktop-bugscrub-reopened". See https://wiki.ubuntu.com/BigDesktopBugScrub for more information.