http://bugs.freedesktop.org/show_bug.cgi?id=21509
Summary: libdrm's drmOpenOnce() fd cache stale on X server
restart
Product: DRI
Version: unspecified
Platform: x86 (IA32)
OS/Version: Linux (All)
Status: NEW
Severity: normal
Priority: low
Component: libdrm
AssignedTo: dri-devel@lists.sourceforge.net
ReportedBy: camaro...@gmail.com
Created an attachment (id=25341)
--> (http://bugs.freedesktop.org/attachment.cgi?id=25341)
patch to xf86drm.c for drmOpenOnce()
Xorg version - custom compiled Xorg 7.4
libdrm version - 2.4.5 (although the problem looks like it's in 2.4.9)
The company I work for runs Xorg in a rather non-standard fashion in that we
don't run a window manager. Recently I was testing a version of Xorg 7.4 that
I have compiled. I was noticing that I could run fgl_glxgears just fine with
one invocation. But every subsequent invocation failed with the X server
printing out:
(EE) AIGLX error: drmGetMagic failed
(EE) AIGLX: reverting to software rendering
fgl_glxgears was the only process that I was running under the X server.
After strace-ing the X server, I found that the drmGetMagic ioctl was
complaining abut an invalid file descriptor.
Looking deeper I found that the drmOpenOnce function was "re-cycling" file
descriptors from the previous server initialization. After applying the
attached patch, things work much better.
I'm not convinced this patch is a good solution. It would probably be better
to have some sort of callback to libdrm for when the server is about to
re-load. When the server does reload it can then purge libdrm's fd cache. How
one would do that I'm not sure. :)
It is completely possible that since I'm using the ATI provided libraries that
they're really the problem here, and they should be cleaning up their used file
descriptors on server exit. My setup would be difficult to convert back to the
mesa provided libraries, I can't test that theory. I'm using the ATI 9.3
driver and libs(can't use 9.4, they deprecated X600 support!).
If anyone needs more information on this report I'm happy to provide it. I'm
not a subscriber to the dri-devel list, so please email me directly - camaronut
at gmail.
Thanks!
Chris Fester
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