[Mesa-stable] [PATCH 0/4] egl/*: Set disp->DriverData to NULL on error

[Nicolas Boichat]

On Thu, Aug 4, 2016 at 7:17 PM, Martin Peres
<martin.peres at linux.intel.com> wrote:
>
>
> On 04/08/16 13:08, Nicolas Boichat wrote:
>>
>> On Thu, Aug 4, 2016 at 5:52 PM, Martin Peres
>> <martin.peres at linux.intel.com> wrote:
>>>
>>> On 04/08/16 05:07, Nicolas Boichat wrote:
>>>>
>>>>
>>>> egl/x11 fixup has already be sent here:
>>>> https://patchwork.freedesktop.org/patch/101934/
>>>>
>>>> Compile-tested only (on android only).
>>>>
>>>> I was first thinking of modifying most functions in egl_dri2.c to take
>>>> in
>>>> dri2_egl_display *dri2_dpy instead of _EGLDisplay *disp as parameter, so
>>>> we do not need to set disp->DriverData early in the dri_initialize_*
>>>> functions.
>>>>
>>>> But there are some functions that do need disp as well:
>>>>  - dri2_add_config, to call _eglInitConfig (disp->DriverData does not
>>>> need
>>>> to be
>>>>    set), and to check if extensions are supported.
>>>>  - dri2_setup_screen (similar reasons)
>>>>
>>>> Ideas to untangle this are welcome. In the mean time, this patch series
>>>> should
>>>> fix crashes and a piglit test.
>>>>
>>>> Nicolas Boichat (4):
>>>>   egl/wayland: Set disp->DriverData to NULL on error
>>>>   egl/surfaceless: Set disp->DriverData to NULL on error
>>>>   egl/drm: Set disp->DriverData to NULL on error
>>>>   egl/android: Set dpy->DriverData to NULL on error
>>>>
>>>
>>> This patch series fixes egl_khr_fence_sync for me:
>>> Tested-by: Martin Peres <martin.peres at linux.intel.com>
>>
>>
>> Thanks!
>>
>>> However, egl-create-context-verify-gl-flavor is still crashing, even with
>>> "egl/dri2: dri2_initialize: Do not reference-count TestOnly display"
>>> applied. The issue is that eglGetProcAddress("glGetString") returns NULL.
>>
>>
>> That's surprising, Michel said that my patch fixed that issue. Did you
>> try reverting "9ee683f877 (egl/dri2: Add reference count for
>> dri2_egl_display)" to confirm that my original patch broke it?
>
>
> Yes, reverting the patch fixes the issue.

Ok, let's see how I understand eglGetProcAddress should work in this case:
- eglapi.c:eglGetProcAddress
- egldriver.c:_eglGetDriverProc
- egldriver.c:_eglMatchDriver, dpy->Options.TestOnly = EGL_TRUE
- egldriver.c:_eglMatchAndInitialize
- Calls drv->API.Initialize = egl_dri2.c:dri2_initialize
- Returns EGL_TRUE as TestOnly is true (before "egl/dri2:
dri2_initialize: Do not reference-count TestOnly display", it would
return EGL_FALSE, so eglGetProcAddress would fail)

So I don't really see how 9ee683f877 + "egl/dri2: dri2_initialize: Do
not reference-count TestOnly display" would fail (while reverting
9ee683f877 would work).

Any chance you could help tracing through the code? Or at least enable
debugging output?

Thanks!

Best,