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On 2012-09-26T05:29:41+00:00 Timo Aaltonen wrote:

downstream bug from ubuntu:

https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/927168

started happening for more people when the default fallback session
started using llvmpipe. Applies to 8.0.x and 9.0.

It's worked around for now ("Check that pixmaps which aren't managed by
us actually exist before binding") but a proper fix should be added to
mesa.

some stacktraces:
https://launchpadlibrarian.net/115551011/Stacktrace.txt
https://launchpadlibrarian.net/115545323/Stacktrace.txt
https://launchpadlibrarian.net/115549285/Stacktrace.txt
https://launchpadlibrarian.net/115587684/Stacktrace.txt
https://launchpadlibrarian.net/115563588/Stacktrace.txt
https://launchpadlibrarian.net/115553644/Stacktrace.txt

Reply at:
https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/927168/comments/29

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On 2014-11-24T20:56:50+00:00 Jfonseca-e wrote:

IIUC the compiz-core patch

https://i116412274.restricted.launchpadlibrarian.net/116412274/2c4b2354
-00dc-11e2-a4a9-002481e91f22.txt?token=60HdnFNMGFc5zJXJwfwH9pN2wg6pmXxn

the fix consisted of not calling glXBindTexImageEXT when

      XGetGeometry (dpy, pixmap, ...)

returns false.


https://www.opengl.org/registry/specs/EXT/texture_from_pixmap.txt does say that 

  "Currently, only pixmaps can be bound to textures.  If <draw> is not a
  valid GLXPixmap, then a GLXBadPixmap error is generated."

so indeed this should be handled better.

This technically is a bug in st/dri though.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/927168/comments/34


** Changed in: mesa
       Status: Unknown => Confirmed

** Changed in: mesa
   Importance: Unknown => Medium

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https://bugs.launchpad.net/bugs/927168

Title:
  compiz crashed with SIGSEGV in memmove() from
  drisw_update_tex_buffer() from dri_set_tex_buffer2() from
  drisw_bind_tex_image() from __glXBindTexImageEXT() from
  TfpTexture::enable() from enableFragmentOperationsAndDrawGeometry()

Status in Compiz:
  Fix Released
Status in Compiz Core:
  Confirmed
Status in Mesa:
  Confirmed
Status in “compiz” package in Ubuntu:
  Fix Released
Status in “mesa” package in Ubuntu:
  Confirmed
Status in “compiz” source package in Quantal:
  Fix Released

Bug description:
  .

  ProblemType: Crash
  DistroRelease: Ubuntu 12.04
  Package: unity 5.2.0-0ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-12.21-generic 3.2.2
  Uname: Linux 3.2.0-12-generic i686
  ApportVersion: 1.91-0ubuntu1
  Architecture: i386
  Date: Sun Feb  5 12:47:01 2012
  ExecutablePath: /usr/bin/compiz
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20111129.1)
  ProcCmdline: compiz
  ProcEnviron:
   LANGUAGE=pt_BR:pt:en
   PATH=(custom, no user)
   LANG=pt_BR.UTF-8
   SHELL=/bin/bash
  SegvAnalysis:
   Segfault happened at: 0x558360:	movdqu (%eax),%xmm0
   PC (0x00558360) ok
   source "(%eax)" (0x81577fc0) not located in a known VMA region (needed readable region)!
   destination "%xmm0" ok
  SegvReason: reading unknown VMA
  Signal: 11
  SourcePackage: unity
  StacktraceTop:
   ?? () from /lib/i386-linux-gnu/libc.so.6
   ?? () from /usr/lib/i386-linux-gnu/dri/swrast_dri.so
   ?? () from /usr/lib/i386-linux-gnu/dri/swrast_dri.so
   ?? () from /usr/lib/i386-linux-gnu/mesa/libGL.so.1
   ?? () from /usr/lib/i386-linux-gnu/mesa/libGL.so.1
  Title: compiz crashed with SIGSEGV
  UpgradeStatus: Upgraded to precise on 2012-02-04 (1 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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