Red Hat Bugzilla – Bug 679629
Fast userswitch and glxgears in comibination with Nouveau X.org driver causes glxgears to crash...
Last modified: 2012-08-07 11:32:47 EDT
Description of problem:
I participated in Nouveau Testing Day (see additional info below).
When attempting to run glxgears on both X.orgs as described in the fastuserswitch testcase I managed to get glxgears to crash.
Quote from dmesg:
[ 1746.004485] [drm] nouveau 0000:05:00.0: Error allocating channel PRAMIN: -12
[ 1746.004491] [drm] nouveau 0000:05:00.0: init pramin
[ 1746.004494] [drm] nouveau 0000:05:00.0: gpuobj -12
[ 1746.004555] glxgears segfault t 18 ip 00007f9db3442839 sp 00007fffef9fec20 error 4 in libdrm_nouveau.so.1.0.0[7f9db3440000+5000]
Version-Release number of selected component (if applicable):
Often to every time.
Steps to Reproduce:
1. Login, open a terminal create a new user.
2. Fastswitch to new user.
3. Start new terminal and start glxgears.
4. Close glxgears
5. Switch back to user liveuser.
6. Attempt to run glxgears and see it segfault!
That it doesn't segfault but rather renders its cogs.
The following livecdimage was used:
Have same issue. Also glxinfo is crashed with same error. Launched both utils under strace if it may help, logs attached.
Created attachment 482907 [details]
glxgears crash log
Created attachment 482908 [details]
glxinfo crash log
Thanks for the bug report. We have reviewed the information you have provided above, and there is some additional information we require that will be helpful in our diagnosis of this issue.
Please add drm.debug=0x04 to the kernel command line, restart computer, and attach
* your X server config file (/etc/X11/xorg.conf, if available),
* X server log file (/var/log/Xorg.*.log)
* output of the dmesg command, and
* system log (/var/log/messages)
to the bug report as individual uncompressed file attachments using the bugzilla file attachment link above.
We will review this issue again once you've had a chance to attach this information.
Thanks in advance.
Created attachment 483878 [details]
xorg log while glxgears crashing
Created attachment 483879 [details]
Created attachment 483880 [details]
X server config doesn't exist for my case. Rest of files attached.
Also I tried to launch X server as "startx -- -logverbose 6" from runlevel 3, but something went wrong and fast user switching wasn't available in this case (some error about desktop .service file was thrown by Gnome).
Used environment: same as Sebastian.
Kernel command line: "BOOT_IMAGE=/gfx_20110221/isolinux/vmlinuz0 root=LABEL=wdmp_e3 rootfstype=auto ro liveimg rd.luks=0 rd.md=0 rd.dm=0 drm.debug=0x04"
Video adapter: Sparkle / nVidia Corporation NV43 [GeForce 6600] [10de:0141] (rev a2).
Can you update to http://koji.fedoraproject.org/koji/buildinfo?buildID=232757 (kernel-2.6.38-0.rc8.git0.2.fc15) and retry?
Nouveau was artificially limiting the number of possible GPU clients to preserve VRAM. For a number of complicated reasons, we have no choice but to reserve VRAM for each and nouveau was erring on the stingy side. I've fixed this now, and the maximum possible number of clients (32) supported by the GPU is now allowed.
Just for future reference if anyone cares, the DRM will use 1 of these, every X server will use 2 (for 2D rendering, another for AIGLX) and each 3D client will use at least one depending on how the client is written.
Sorry for the delay, I've been caught up in work in the real world. :-/
I've bought a USB stick to use for testing though so I hope to retest this and return to you with answers during the coming week.
> Can you update to http://koji.fedoraproject.org/koji/buildinfo?buildID=232757
(kernel-2.6.38-0.rc8.git0.2.fc15) and retry?
Sorry, I used live image for testing. Is it suitable to use image from the following link?
Fixed, as for me. However, just one instance of glxgears or glxinfo is working at one time. If you launch second one, it waits for completion of the first.
Used image: http://koji.fedoraproject.org/koji/taskinfo?taskID=2947116 (Fedora-15-Nightly-20110325.20-x86_64-Live-desktop.iso)
Is it an expected behaviour or some logs should be attached?
That's very odd. There's nothing in nouveau itself which'd do such a wait.
However, can you run glxinfo in gdb and get a backtrace of where it's stuck waiting, just to be sure.
Sorry, I didn't found how to make gdb output more informative than simple case like "gdb glxinfo" -> "run". There are nothing interesting even with debuginfo package installed.
I've run glxinfo under strace -ir and the wait can be noticed there. Used environment is same, other logs is attached too.
Also it isn't a stable issue. The best way to observe it is a simple default login and launching terminal to reproducing — no more windows, user sessions or other actions.
Created attachment 489626 [details]
: dmesg output
Created attachment 489627 [details]
: xorg log
Created attachment 489628 [details]
Created attachment 489629 [details]
: strace for glxinfo
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