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[Bug 728830] Re: Reproducible: OpenGL application segfaults Xorg (w/ nvidia driver) every 15 minutes

To: ubuntu-x-swat@xxxxxxxxxxxxxxxxxxx
From: Brad Parker <728830@xxxxxxxxxxxxxxxxxx>
Date: Fri, 04 Mar 2011 18:04:12 -0000
Reply-to: Bug 728830 <728830@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Also I have attached a gdb session (attachment is called xorg-gdb.txt)
for Xorg itself.

** Attachment added: "xorg-gdb.txt"
   https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/728830/+attachment/1885847/+files/xorg-gdb.txt

** Description changed:

  I have written an application that uses Qt, GStreamer and OpenGL. The
  application simply plays fullscreen videos in a loop. I'm using the
  nvidia-current driver on Maverick as my program requires 3D
  acceleration. Without fail, every 15 minutes, the application receives a
  SIGSEGV, followed by Xorg also receiving one. The backtrace from Xorg
  is:
  
  Backtrace:
  [  7785.849] 0: /usr/bin/X (xorg_backtrace+0x28) [0x45c5a8]
  [  7785.849] 1: /usr/bin/X (0x400000+0x5a87d) [0x45a87d]
  [  7785.849] 2: /lib/libpthread.so.0 (0x7fc407208000+0xfb40) [0x7fc407217b40]
  [  7785.849] 3: /usr/lib/xorg/extra-modules/nvidia_drv.so (0x7fc401b80000+0x73a51) [0x7fc401bf3a51]
  [  7785.849] 4: /usr/lib/xorg/extra-modules/nvidia_drv.so (0x7fc401b80000+0x39ddec) [0x7fc401f1ddec]
  [  7785.849] 5: /usr/lib/xorg/extra-modules/nvidia_drv.so (0x7fc401b80000+0x3acef7) [0x7fc401f2cef7]
  [  7785.849] 6: /usr/bin/X (0x400000+0x3f979) [0x43f979]
  [  7785.849] 7: /usr/bin/X (0x400000+0x2187b) [0x42187b]
  [  7785.849] 8: /lib/libc.so.6 (__libc_start_main+0xfe) [0x7fc406173d8e]
  [  7785.849] 9: /usr/bin/X (0x400000+0x21409) [0x421409]
  [  7785.849] Segmentation fault at address 0x1a000c4a150
  [  7785.849]
  Caught signal 11 (Segmentation fault). Server aborting
  
  I have also attached a full gdb backtrace from the core that was dumped
  from my application. I'm not sure if this is an nvidia driver bug or an
  Xorg one, but I'm able to reproduce it on multiple machines of different
  hardware configuration, with different nvidia adapters and driver
  versions. I have tried an Nvidia ION chipset as well as an NVS 300,
  along with the binary nvidia driver versions 260.19.06-0ubuntu1 (the
  stock driver available in current Maverick repo) as well as 260.19.36
  (downloaded from nvidia.com) and 270.29-0ubuntu1~maverick~xup2 (from
- ppa:ubuntu-x-swat/x-updates).
+ ppa:ubuntu-x-swat/x-updates). It appears that the video driver tries to
+ free() a null pointer, and that causes the segfault, but I could be
+ wrong.
  
  Any help is greatly appreciated. Thanks!
  
  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: xserver-xorg-core 2:1.9.0-0ubuntu7.3
  ProcVersionSignature: Ubuntu 2.6.35-27.48-generic 2.6.35.11
  Uname: Linux 2.6.35-27-generic x86_64
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.version:
-  NVRM version: NVIDIA UNIX x86_64 Kernel Module  260.19.06  Mon Sep 13 04:29:19 PDT 2010
-  GCC version:  gcc version 4.4.5 (Ubuntu/Linaro 4.4.4-14ubuntu5)
+  NVRM version: NVIDIA UNIX x86_64 Kernel Module  260.19.06  Mon Sep 13 04:29:19 PDT 2010
+  GCC version:  gcc version 4.4.5 (Ubuntu/Linaro 4.4.4-14ubuntu5)
  Architecture: amd64
  Date: Thu Mar  3 21:28:50 2011
  DkmsStatus: nvidia-current, 260.19.06, 2.6.35-27-generic, x86_64: installed
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  MachineType: Supermicro X8DT6
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-27-generic root=UUID=7b9f3db9-205c-483e-aac8-fb96339e4df2 ro quiet splash
  ProcEnviron:
-  LANG=en_US.utf8
-  SHELL=/bin/bash
+  LANG=en_US.utf8
+  SHELL=/bin/bash
  SourcePackage: xorg-server
  dmi.bios.date: 09/14/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2.0a
  dmi.board.asset.tag: 1234567890
  dmi.board.name: X8DT6
  dmi.board.vendor: Supermicro
  dmi.board.version: 1234567890
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 17
  dmi.chassis.vendor: Supermicro
  dmi.chassis.version: 1234567890
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2.0a:bd09/14/2010:svnSupermicro:pnX8DT6:pvr1234567890:rvnSupermicro:rnX8DT6:rvr1234567890:cvnSupermicro:ct17:cvr1234567890:
  dmi.product.name: X8DT6
  dmi.product.version: 1234567890
  dmi.sys.vendor: Supermicro
  glxinfo: Error: [Errno 2] No such file or directory
  system:
-  distro:             Ubuntu
-  codename:           maverick
-  architecture:       x86_64
-  kernel:             2.6.35-27-generic
+  distro:             Ubuntu
+  codename:           maverick
+  architecture:       x86_64
+  kernel:             2.6.35-27-generic

** Description changed:

  I have written an application that uses Qt, GStreamer and OpenGL. The
  application simply plays fullscreen videos in a loop. I'm using the
  nvidia-current driver on Maverick as my program requires 3D
  acceleration. Without fail, every 15 minutes, the application receives a
  SIGSEGV, followed by Xorg also receiving one. The backtrace from Xorg
  is:
  
  Backtrace:
  [  7785.849] 0: /usr/bin/X (xorg_backtrace+0x28) [0x45c5a8]
  [  7785.849] 1: /usr/bin/X (0x400000+0x5a87d) [0x45a87d]
  [  7785.849] 2: /lib/libpthread.so.0 (0x7fc407208000+0xfb40) [0x7fc407217b40]
  [  7785.849] 3: /usr/lib/xorg/extra-modules/nvidia_drv.so (0x7fc401b80000+0x73a51) [0x7fc401bf3a51]
  [  7785.849] 4: /usr/lib/xorg/extra-modules/nvidia_drv.so (0x7fc401b80000+0x39ddec) [0x7fc401f1ddec]
  [  7785.849] 5: /usr/lib/xorg/extra-modules/nvidia_drv.so (0x7fc401b80000+0x3acef7) [0x7fc401f2cef7]
  [  7785.849] 6: /usr/bin/X (0x400000+0x3f979) [0x43f979]
  [  7785.849] 7: /usr/bin/X (0x400000+0x2187b) [0x42187b]
  [  7785.849] 8: /lib/libc.so.6 (__libc_start_main+0xfe) [0x7fc406173d8e]
  [  7785.849] 9: /usr/bin/X (0x400000+0x21409) [0x421409]
  [  7785.849] Segmentation fault at address 0x1a000c4a150
  [  7785.849]
  Caught signal 11 (Segmentation fault). Server aborting
  
  I have also attached a full gdb backtrace from the core that was dumped
  from my application. I'm not sure if this is an nvidia driver bug or an
  Xorg one, but I'm able to reproduce it on multiple machines of different
  hardware configuration, with different nvidia adapters and driver
  versions. I have tried an Nvidia ION chipset as well as an NVS 300,
  along with the binary nvidia driver versions 260.19.06-0ubuntu1 (the
  stock driver available in current Maverick repo) as well as 260.19.36
  (downloaded from nvidia.com) and 270.29-0ubuntu1~maverick~xup2 (from
- ppa:ubuntu-x-swat/x-updates). It appears that the video driver tries to
- free() a null pointer, and that causes the segfault, but I could be
- wrong.
+ ppa:ubuntu-x-swat/x-updates). It appears that either X or the video
+ driver tries to free() an invalid (or null) pointer, and that causes the
+ segfault, but I could be wrong.
  
  Any help is greatly appreciated. Thanks!
  
  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: xserver-xorg-core 2:1.9.0-0ubuntu7.3
  ProcVersionSignature: Ubuntu 2.6.35-27.48-generic 2.6.35.11
  Uname: Linux 2.6.35-27-generic x86_64
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  260.19.06  Mon Sep 13 04:29:19 PDT 2010
   GCC version:  gcc version 4.4.5 (Ubuntu/Linaro 4.4.4-14ubuntu5)
  Architecture: amd64
  Date: Thu Mar  3 21:28:50 2011
  DkmsStatus: nvidia-current, 260.19.06, 2.6.35-27-generic, x86_64: installed
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  MachineType: Supermicro X8DT6
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-27-generic root=UUID=7b9f3db9-205c-483e-aac8-fb96339e4df2 ro quiet splash
  ProcEnviron:
   LANG=en_US.utf8
   SHELL=/bin/bash
  SourcePackage: xorg-server
  dmi.bios.date: 09/14/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2.0a
  dmi.board.asset.tag: 1234567890
  dmi.board.name: X8DT6
  dmi.board.vendor: Supermicro
  dmi.board.version: 1234567890
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 17
  dmi.chassis.vendor: Supermicro
  dmi.chassis.version: 1234567890
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2.0a:bd09/14/2010:svnSupermicro:pnX8DT6:pvr1234567890:rvnSupermicro:rnX8DT6:rvr1234567890:cvnSupermicro:ct17:cvr1234567890:
  dmi.product.name: X8DT6
  dmi.product.version: 1234567890
  dmi.sys.vendor: Supermicro
  glxinfo: Error: [Errno 2] No such file or directory
  system:
   distro:             Ubuntu
   codename:           maverick
   architecture:       x86_64
   kernel:             2.6.35-27-generic

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https://bugs.launchpad.net/bugs/728830

Title:
  Reproducible: OpenGL application segfaults Xorg (w/ nvidia driver)
  every 15 minutes
References

[Bug 728830] [NEW] Reproducible: OpenGL application segfaults Xorg (w/ nvidia driver) every 15 minutes
From: Brad Parker, 2011-03-04