ubuntu-x-swat team mailing list archive

[Bryce Harrington <bryce@xxxxxxxxxxxxxxxxxxx>]

Hi Ara, it looks like this crash is occuring in libpixman although it's
unclear from the X trace what routines were being called.  Are you still
able to reproduce this issue on current Lucid?  If so please collect a
full backtrace after reproducing the issue - see
http://wiki.ubuntu.com/X/Backtracing for guidance.  If not, then this
bug can be closed.  It sounds quite similar to another one I
investigated a couple months ago that is now solved, but hard to say for
certain.

** Description changed:

  Binary package hint: gdm
  
  In Lucid Alpha 1 testing.
  
  Steps to reproduce:
  
-  * Log in with the default user
-  * Without closing the session, go to the Guest Session
-  * Without closing the Guest Session, go to Switch User (the default user would appear as logged in) and select the default user
-  * Without closing the session, again, go to Guest Session
-  *  Without closing the Guest Session, again, go to Switch User (the default user would appear as logged in) and select the default user. GDM crashes.
+  * Log in with the default user
+  * Without closing the session, go to the Guest Session
+  * Without closing the Guest Session, go to Switch User (the default user would appear as logged in) and select the default user
+  * Without closing the session, again, go to Guest Session
+  *  Without closing the Guest Session, again, go to Switch User (the default user would appear as logged in) and select the default user. GDM crashes.
  
  Apport (although I enabled it) didn't catch the crash. I will attach
  dmesg and syslog.
+ 
+ [   92.591398] gdm-simple-slav[1775]: segfault at 28 ip 008e46ef sp bfcb78e0 error 4 in libX11.so.6.3.0[8a3000+119000]
+ [   92.591522] Process 1775(gdm-simple-slav) has RLIMIT_CORE set to 0
+ [   92.591524] Aborting core
+ [   92.625652] gdm-session-wor[1847]: segfault at 0 ip 004156c7 sp bfb650d0 error 4 in libpam.so.0.82.1[410000+b000]
+ [   92.625670] Process 1847(gdm-session-wor) has RLIMIT_CORE set to 0
+ [   92.625671] Aborting core
+ [  108.420521] Process 729(Xorg) has RLIMIT_CORE set to 0
+ [  108.420524] Aborting core
+ 
  
  ProblemType: Bug
  Architecture: i386
  Date: Thu Dec 10 16:06:59 2009
  DistroRelease: Ubuntu 10.04
  EcryptfsInUse: Yes
  InstallationMedia: Error: [Errno 13] Permission denied: '/var/log/installer/media-info'
  Package: gdm 2.29.1-0ubuntu3
  ProcEnviron:
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.32-7.10-generic
  SourcePackage: gdm
  Tags: lucid
  Uname: Linux 2.6.32-7-generic i686

** Description changed:

  Binary package hint: gdm
  
  In Lucid Alpha 1 testing.
  
  Steps to reproduce:
  
   * Log in with the default user
   * Without closing the session, go to the Guest Session
   * Without closing the Guest Session, go to Switch User (the default user would appear as logged in) and select the default user
   * Without closing the session, again, go to Guest Session
   *  Without closing the Guest Session, again, go to Switch User (the default user would appear as logged in) and select the default user. GDM crashes.
  
  Apport (although I enabled it) didn't catch the crash. I will attach
  dmesg and syslog.
  
  [   92.591398] gdm-simple-slav[1775]: segfault at 28 ip 008e46ef sp bfcb78e0 error 4 in libX11.so.6.3.0[8a3000+119000]
  [   92.591522] Process 1775(gdm-simple-slav) has RLIMIT_CORE set to 0
  [   92.591524] Aborting core
  [   92.625652] gdm-session-wor[1847]: segfault at 0 ip 004156c7 sp bfb650d0 error 4 in libpam.so.0.82.1[410000+b000]
  [   92.625670] Process 1847(gdm-session-wor) has RLIMIT_CORE set to 0
  [   92.625671] Aborting core
  [  108.420521] Process 729(Xorg) has RLIMIT_CORE set to 0
  [  108.420524] Aborting core
  
+ Backtrace:
+ 0: /usr/bin/X (xorg_backtrace+0x3b) [0x80e847b]
+ 1: /usr/bin/X (0x8048000+0x617b5) [0x80a97b5]
+ 2: (vdso) (__kernel_rt_sigreturn+0x0) [0x34f410]
+ 3: /usr/lib/libpixman-1.so.0 (0x513000+0x3fc35) [0x552c35]
+ 4: /usr/lib/libpixman-1.so.0 (0x513000+0x14569) [0x527569]
+ 5: /usr/lib/libpixman-1.so.0 (0x513000+0x3a248) [0x54d248]
+ 6: /usr/lib/libpixman-1.so.0 (0x513000+0x4201a) [0x55501a]
+ 7: /usr/lib/libpixman-1.so.0 (0x513000+0x4323a) [0x55623a]
+ 8: /usr/lib/libpixman-1.so.0 (0x513000+0x39ef3) [0x54cef3]
+ 9: /usr/lib/libpixman-1.so.0 (0x513000+0x150e3) [0x5280e3]
+ 10: /usr/lib/libpixman-1.so.0 (0x513000+0x3bf6e) [0x54ef6e]
+ 11: /usr/lib/libpixman-1.so.0 (0x513000+0x150e3) [0x5280e3]
+ 12: /usr/lib/libpixman-1.so.0 (0x513000+0x47383) [0x55a383]
+ 13: /usr/lib/libpixman-1.so.0 (0x513000+0x150e3) [0x5280e3]
+ 14: /usr/lib/libpixman-1.so.0 (0x513000+0x4daa9) [0x560aa9]
+ 15: /usr/lib/libpixman-1.so.0 (0x513000+0x150e3) [0x5280e3]
+ 16: /usr/lib/libpixman-1.so.0 (pixman_image_composite+0x16f) [0x54ddef]
+ 17: /usr/lib/xorg/modules/libfb.so (fbComposite+0x16f) [0x3cce3f]
+ 18: /usr/bin/X (0x8048000+0xd75db) [0x811f5db]
+ 19: /usr/bin/X (CompositePicture+0x298) [0x8112d98]
+ 20: /usr/bin/X (0x8048000+0x16be95) [0x81b3e95]
+ 21: /usr/bin/X (0x8048000+0x16c00d) [0x81b400d]
+ 22: /usr/bin/X (0x8048000+0xa3fb5) [0x80ebfb5]
+ 23: /usr/bin/X (ConfigureWindow+0x9db) [0x809c55b]
+ 24: /usr/bin/X (0x8048000+0x29742) [0x8071742]
+ 25: /usr/bin/X (0x8048000+0x2a237) [0x8072237]
+ 26: /usr/bin/X (0x8048000+0x1ec0a) [0x8066c0a]
+ 27: /lib/tls/i686/cmov/libc.so.6 (__libc_start_main+0xe6) [0x1d9b56]
+ 28: /usr/bin/X (0x8048000+0x1e7f1) [0x80667f1]
+ Segmentation fault at address 0x7f0
+ 
  
  ProblemType: Bug
  Architecture: i386
  Date: Thu Dec 10 16:06:59 2009
  DistroRelease: Ubuntu 10.04
  EcryptfsInUse: Yes
  InstallationMedia: Error: [Errno 13] Permission denied: '/var/log/installer/media-info'
  Package: gdm 2.29.1-0ubuntu3
  ProcEnviron:
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.32-7.10-generic
  SourcePackage: gdm
  Tags: lucid
  Uname: Linux 2.6.32-7-generic i686

** Changed in: xorg-server (Ubuntu)
       Status: Confirmed => Incomplete

-- 
Changing from default user to guest session and back crashes gdm
https://bugs.launchpad.net/bugs/495082
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