Bug 73778 - _glapi_tls_Dispatch undefined
Summary: _glapi_tls_Dispatch undefined
Alias: None
Product: Mesa
Classification: Unclassified
Component: Drivers/DRI/i915 (show other bugs)
Version: git
Hardware: x86-64 (AMD64) All
: medium blocker
Assignee: Intel 3D Bugs Mailing List
QA Contact:
Depends on:
Reported: 2014-01-18 22:42 UTC by samrg472
Modified: 2016-12-09 17:51 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:


Note You need to log in before you can comment on or make changes to this bug.
Description samrg472 2014-01-18 22:42:10 UTC
There are issues when opening i915_dri.so, the function _glapi_tls_Dispatch is undefined. 

$ nm -D /usr/lib/libGL.so | grep glapi
  U _glapi_check_multithread
  U _glapi_get_dispatch_table_size
  U _glapi_get_proc_address
  U _glapi_get_proc_offset
  U _glapi_set_context
  U _glapi_set_dispatch
  U _glapi_tls_Dispatch

U = undefined

These issues are logged in /var/log/Xorg.0.log
  (EE) AIGLX error: dlopen of /usr/lib/xorg/modules/dri/i915_dri.so failed (/usr/lib/xorg/modules/dri/i915_dri.so: undefined symbol: _glapi_tls_Dispatch)
  (EE) AIGLX: reverting to software rendering
  (EE) AIGLX error: dlopen of /usr/lib/xorg/modules/dri/swrast_dri.so failed (/usr/lib/xorg/modules/dri/swrast_dri.so: undefined symbol: _glapi_tls_Dispatch)
  (EE) GLX: could not load software renderer
  (II) GLX: no usable GL providers found for screen 0

Of course, since the driver isn't loaded, nothing works.
$ glxgears
  Error: couldn't get an RGB, Double-buffered visual
Comment 1 Ian Romanick 2014-01-22 00:27:15 UTC
It sounds like either the drivers or libGL wasn't built with --enable-glx-tls.  Did you build this yourself?
Comment 2 samrg472 2014-01-22 01:55:30 UTC
Ah. The version of 10.0.2-1 in the Arch Linux repositories 
( https://www.archlinux.org/packages/extra/x86_64/mesa-libgl/ ) Also had this issue. I will try a rebuild now with that flag and see what happens.
Comment 3 samrg472 2014-01-22 01:57:43 UTC
To append to the previous comment:
I did build it myself after the Arch Linux repositories version also had this issue
Comment 4 samrg472 2014-01-22 02:29:52 UTC
Ok. I have now built with the --enable-glx-tls. This does fix the driver loading issue in xorg. However, it creates another issue. Now _glapi_tls_Context is undefined.

$ glxgears
  libGL: OpenDriver: trying /usr/local/lib/dri/i915_dri.so
  libGL error: dlopen /usr/local/lib/dri/i915_dri.so failed                                                                                                           (/usr/local/lib/dri/i915_dri.so: undefined symbol: _glapi_tls_Context)
  libGL error: unable to load driver: i915_dri.so
  libGL error: driver pointer missing
  libGL error: failed to load driver: i915
  libGL: OpenDriver: trying /usr/local/lib/dri/swrast_dri.so
  libGL error: dlopen /usr/local/lib/dri/swrast_dri.so failed     (/usr/local/lib/dri/swrast_dri.so: undefined symbol: _glapi_tls_Context)
  libGL error: unable to load driver: swrast_dri.so
  libGL error: failed to load driver: swrast

While it appears that GL applications appear to be working. This creates some major issues in how GL applications operate. Probably due to my actual driver thats needed to be failing. I'm not sure exactly what driver is being loaded. But I do know the driver I need does still fail to load. And this issue causes major rendering issues in GL powered games.
Comment 5 Matt Turner 2014-02-02 03:41:11 UTC
You're going to need to use something like strace to make sure that the proper libGL is being used.
Comment 6 Emil Velikov 2014-09-23 01:26:04 UTC
To be honest I'm not sure why nm insists that the symbol is undefined, despite ldd being silent and objdump explicitly indicating that we link correctly.

1. Check that the symbol is provided via libglapi.so.0.0.0
$ nm -CD --defined-only /usr/lib/libglapi.so.0.0.0 | grep glapi_tls_Context
0000000000000008 B _glapi_tls_Context

2. And libGL.so.1.2.0 is correctly linked
$ objdump -x /usr/lib/libGL.so.1.2.0| grep NEEDED | grep libglapi
  NEEDED               libglapi.so.0

3. Ask ldd if it "sees" any undefined symbols
$ ldd -r /usr/lib/libGL.so.1.2.0 | grep undefined | wc -l

4. On the other hand the dri modules have some (_glapi_* only). This is normal
$ ldd -r /usr/lib/xorg/modules/dri/swrast_dri.so | grep undefined
undefined symbol: _glapi_tls_Dispatch
undefined symbol: _glapi_tls_Context

So I'm not really sure what exactly nm means with undefined, and why it does it, yet it tags nearly every imported symbol as U.

Give the above commands a try and let us know how it goes. As Matt mentioned strace log would be appreciated as well.
$ strace glxinfo

Btw I'm running Archlinux on two machines with nouveau_dri.so and i965_dri.so and I've not seen any problems.
Comment 7 Emil Velikov 2016-12-09 17:51:26 UTC
As mentioned - issue is likely a misconfigured build. The option will be toggled to enabled shortly.

Feel free to reopen, if things persist with --enable-glx-tls

Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.