[Xquartz-dev] Help requested debugging rgl under XQuartz
Duncan Murdoch
murdoch.duncan at gmail.com
Wed Feb 24 06:26:58 PST 2021
Tracing in with lldb, it appears to be this sequence of calls leading to
the 10005 error value:
r
* frame #0: 0x00007fff5afc19e0
libGPUSupportMercury.dylib`gldAttachDrawable + 1
frame #1: 0x00007fff4467f396 GLEngine`gliAttachDrawableWithOptions
+ 251
frame #2: 0x00007fff4465d9f5
OpenGL`___lldb_unnamed_symbol40$$OpenGL + 972
frame #3: 0x00007fff446618e2
OpenGL`___lldb_unnamed_symbol59$$OpenGL + 82
frame #4: 0x00007fff44661c29 OpenGL`CGLSetSurface + 330
frame #5: 0x00007fff70c6ca63
libXplugin.1.dylib`xp_attach_gl_context + 95
frame #6: 0x0000000108590dee libGL.1.dylib`surface_make_current + 206
frame #7: 0x000000010858df6a
libGL.1.dylib`apple_glx_make_current_context + 1274
frame #8: 0x0000000108574579 libGL.1.dylib`applegl_bind_context + 185
frame #9: 0x000000010856237e libGL.1.dylib`MakeContextCurrent + 414
frame #10: 0x00000001085621d9 libGL.1.dylib`glXMakeCurrent + 41
The libGPUSupportMercury.dylib`gldAttachDrawable function calls
IOAccelGLContextClearDrawable
then does some sort of check of __stack_chk_guard and doesn't like what
it sees, and sets the error.
Does this give any hint about what's wrong, or a way to fix it?
Duncan Murdoch
On 23/02/2021 4:31 p.m., Duncan Murdoch wrote:
> On 23/02/2021 3:47 p.m., Jeremy Huddleston Sequoia wrote:
>>
>>
>>> On Feb 23, 2021, at 06:14, Duncan Murdoch <murdoch.duncan at gmail.com
>>> <mailto:murdoch.duncan at gmail.com>> wrote:
>>>
>>> On 23/02/2021 12:47 a.m., Jeremy Huddleston Sequoia wrote:
>>>>> On Feb 22, 2021, at 14:38, Duncan Murdoch <murdoch.duncan at gmail.com
>>>>> <mailto:murdoch.duncan at gmail.com> <mailto:murdoch.duncan at gmail.com
>>>>> <mailto:murdoch.duncan at gmail.com>>> wrote:
>>>>>
>>>>> I've made a little bit of progress.
>>>>>
>>>>> The message "error: xp_attach_gl_context returned: 2" comes from the
>>>>> Mesa routine surface_make_current, which calls xp_attach_gl_context.
>>>>> I haven't found where xp_attach_gl_context is defined.
>>>> xp_attach_gl_context is in libXplugin (check Xplugin.h in the SDK).
>>>> 2 is XP_BadValue, which is returned if cgl_ctx is NULL... so I'd
>>>> suggest looking into why mesa is calling xp_attach_gl_context with a
>>>> NULL context.
>>>
>>> Thanks, that's helpful. The context is not NULL, so I need to think
>>> of other ways it could be "bad".
>>
>> Ok, well xp_attach_gl_context is just a wrapper around CGLSetSurface(),
>> which is an internal function to do exactly what we're trying to do
>> here. If it returns any error, xp_attach_gl_context returns bad value.
>>
>> Are you able to capture this in the debugger and figure out what the
>> return value from CGLSetSurface() is? That will tell us what the
>> underlying CGLError is, which might help shed some light on this.
>
> I believe it's returning 0x0000000000002715 when there's an error.
> That's 10005, kCGLBadDrawable. So now I need to find out what happened
> to the drawable.
>
> This feels like progress! Thanks again.
>
> Duncan
>>
>>> Here's what I see with LIBGL_DIAGNOSTIC=1. For a successful open,
>>>
>>>> rgl.open()
>>> function is no-op
>>> Debug ../src/glx/apple/apple_glx_context.c:205
>>> apple_glx_create_context(4295810496): apple_glx_create_context: ac
>>> 0x100a10a00 ac->context_obj 0x107cdce00
>>> 2021-02-23 08:23:00.041711-0500 R[45754:1283995]
>>> apple_glx_create_context: ac 0x100a10a00 ac->context_obj 0x107cdce00
>>> Debug ../src/glx/apple/apple_glx_drawable.c:342
>>> apple_glx_drawable_create(4295810496): apple_glx_drawable_create: new
>>> drawable 0x107ce0e00
>>> 2021-02-23 08:23:00.042235-0500 R[45754:1283995]
>>> apple_glx_drawable_create: new drawable 0x107ce0e00
>>> Debug ../src/glx/apple/apple_glx_surface.c:154
>>> create_surface(4295810496): create_surface: created a surface for
>>> drawable 0x600066 with uid 621
>>> 2021-02-23 08:23:00.044773-0500 R[45754:1283995] create_surface:
>>> created a surface for drawable 0x600066 with uid 621
>>> Debug ../src/glx/apple/apple_glx_surface.c:69
>>> surface_make_current(4295810496): surface_make_current:
>>> ac->context_obj 0x107cdce00 s->surface_id 9
>>> 2021-02-23 08:23:00.044839-0500 R[45754:1283995] surface_make_current:
>>> ac->context_obj 0x107cdce00 s->surface_id 9
>>> Debug ../src/glx/apple/apple_glx_surface.c:89
>>> surface_make_current(4295810496): surface_make_current: drawable 0x600066
>>> 2021-02-23 08:23:00.045680-0500 R[45754:1283995] surface_make_current:
>>> drawable 0x600066
>>> ... (more lines deleted)
>>>
>>> After I run quartz(), I see this:
>>>
>>>> rgl.open()
>>> Debug ../src/glx/apple/apple_glx_context.c:205
>>> apple_glx_create_context(4295810496): apple_glx_create_context: ac
>>> 0x10262bb00 ac->context_obj 0x1058c4800
>>> 2021-02-23 08:23:35.666675-0500 R[45754:1283995]
>>> apple_glx_create_context: ac 0x10262bb00 ac->context_obj 0x1058c4800
>>> Debug ../src/glx/apple/apple_glx_drawable.c:342
>>> apple_glx_drawable_create(4295810496): apple_glx_drawable_create: new
>>> drawable 0x107648000
>>> 2021-02-23 08:23:35.667040-0500 R[45754:1283995]
>>> apple_glx_drawable_create: new drawable 0x107648000
>>> Debug ../src/glx/apple/apple_glx_surface.c:154
>>> create_surface(4295810496): create_surface: created a surface for
>>> drawable 0x6000c9 with uid 629
>>> 2021-02-23 08:23:35.669119-0500 R[45754:1283995] create_surface:
>>> created a surface for drawable 0x6000c9 with uid 629
>>> Debug ../src/glx/apple/apple_glx_surface.c:69
>>> surface_make_current(4295810496): surface_make_current:
>>> ac->context_obj 0x1058c4800 s->surface_id 13
>>> 2021-02-23 08:23:35.669195-0500 R[45754:1283995] surface_make_current:
>>> ac->context_obj 0x1058c4800 s->surface_id 13
>>> error: xp_attach_gl_context returned: 2
>>> Debug ../src/glx/applegl_glx.c:60
>>> applegl_bind_context(4295810496): applegl_bind_context: error YES
>>> 2021-02-23 08:23:35.669834-0500 R[45754:1283995] applegl_bind_context:
>>> error YES
>>>
>>> and then I get my own messages from the failure of glXMakeCurrent().
>>> As far as I can see, everything appears fine until the call to
>>> xp_attach_gl_context.
>>>
>>>
>>> Everything looks very similar up to the failure of
>>> xp_attach_gl_context. Any idea I why the value returned a few lines
>>> earlier from apple_glx_create_context() should be a bad value?
>>>
>>> Duncan Murdoch
>>>
>>>
>>
>
More information about the Xquartz-dev
mailing list