opengl SIGSEGV on macOS

[harry-xm]

Describe the bug
Always reproducible crash of opengl process on macOS 13.

To Reproduce
Steps to reproduce the behavior:

1. Open Xpra client on macOS
2. Connect to remote server
3. See opengl crash with SIGSEGV
4. Connection to server is successful regardless of opengl crash

System Information (please complete the following information):

• Server OS Arch Linux
• Client OS macOS 13.6 (x86_64)
• Xpra Server Version 4.4.5
• Xpra Client Version 5.0.2 and 5.0.3-r0 (from official binaries)

Additional context

System crash log

Process:               Xpra [35964]
Path:                  /Applications/Xpra.app/Contents/Resources/bin/Xpra
Identifier:            org.xpra.xpra
Version:               5.0.3 (0.0)
Code Type:             X86-64 (Native)
Parent Process:        Xpra [35893]
Responsible:           Xpra [35778]
User ID:               501

Date/Time:             2023-10-24 09:33:00.4416 +0800
OS Version:            macOS 13.6 (22G120)
Report Version:        12
Bridge OS Version:     8.0 (21P365)
Anonymous UUID:        x

Sleep/Wake UUID:       C68F5BE3-01A0-401A-A814-F7ADD614B891

Time Awake Since Boot: 17000 seconds
Time Since Wake:       247 seconds

System Integrity Protection: enabled

Crashed Thread:        0  xpra opengl  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       UNKNOWN_0xD at 0x0000000000000000
Exception Codes:       0x000000000000000d, 0x0000000000000000

Termination Reason:    Namespace SIGNAL, Code 11 Segmentation fault: 11
Terminating Process:   exc handler [35964]

VM Region Info: 0 is not in any region.  Bytes before following region: 4308074496
      REGION TYPE                    START - END         [ VSIZE] PRT/MAX SHRMOD  REGION DETAIL
      UNUSED SPACE AT START
--->  
      __TEXT                      100c80000-100c84000    [   16K] r-x/r-x SM=COW  ...rces/bin/Xpra

Thread 0 Crashed:: xpra opengl Dispatch queue: com.apple.main-thread
0   libgobject-2.0.0.dylib        	       0x10208bca3 g_type_check_instance_is_fundamentally_a + 19
1   libgobject-2.0.0.dylib        	       0x102074e77 g_object_get_qdata + 23
2   _gi.cpython-311-darwin.so     	       0x101f4ca06 pygobject_dealloc + 54
3   libpython3.11.dylib           	       0x101315fbb subtype_dealloc + 971
4   libpython3.11.dylib           	       0x1013e0cd1 _PyFrame_Clear + 257
5   libpython3.11.dylib           	       0x1013ae32b _PyEval_EvalFrameDefault + 15163
6   libpython3.11.dylib           	       0x1013aa56f PyEval_EvalCode + 191
7   libpython3.11.dylib           	       0x10140bd3f PyRun_StringFlags + 223
8   libpython3.11.dylib           	       0x10140bc15 PyRun_SimpleStringFlags + 69
9   libpython3.11.dylib           	       0x10142c360 Py_RunMain + 880
10  libpython3.11.dylib           	       0x10142ccb3 pymain_main + 339
11  libpython3.11.dylib           	       0x10142cd0b Py_BytesMain + 43
12  dyld                          	    0x7ff817bc141f start + 1903

Thread 1:
0   libsystem_pthread.dylib       	    0x7ff817f16bb0 start_wqthread + 0

Thread 2:
0   libsystem_pthread.dylib       	    0x7ff817f16bb0 start_wqthread + 0

Thread 3:
0   libsystem_pthread.dylib       	    0x7ff817f16bb0 start_wqthread + 0

Thread 4:
0   libsystem_pthread.dylib       	    0x7ff817f16bb0 start_wqthread + 0


Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x0000000000000000  rbx: 0x00007fab6928c2b0  rcx: 0x5000000000000000  rdx: 0x0000000109b5f7f0
  rdi: 0x00007fab6928c2b0  rsi: 0x0000000000000050  rbp: 0x00007ff7bf27e510  rsp: 0x00007ff7bf27e510
   r8: 0x0000000100cf0898   r9: 0x000000010164fc34  r10: 0x0000000106051ab0  r11: 0x000000010166a9e8
  r12: 0x0000000108d92740  r13: 0x0000000101669f50  r14: 0x000000000000003f  r15: 0x00007fab6c6a8f70
  rip: 0x000000010208bca3  rfl: 0x0000000000010206  cr2: 0x00007f26f1d287a8
  
Logical CPU:     5
Error Code:      0x00000000 
Trap Number:     13

Thread 0 instruction stream:
  74 db 48 83 c1 ff 48 8b-47 f8 48 83 c0 f8 49 f7  t.H...H.G.H...I.
  e2 48 c1 ea 04 48 39 d1-73 c3 48 8d 0c 49 48 8d  .H...H9.s.H..IH.
  04 cf 48 83 c0 08 48 8b-4c cf 08 49 3b 4b 48 49  ..H...H.L..I;KHI
  0f 45 c0 eb aa 48 39 30-0f 94 c0 e9 78 ff ff ff  .E...H90....x...
  48 85 c0 0f 95 c0 e9 6d-ff ff ff 66 90 55 48 89  H......m...f.UH.
  e5 31 c0 48 85 ff 74 41-48 8b 0f 48 85 c9 74 39  .1.H..tAH..H..t9
 [48]8b 09 48 81 f9 fd 03-00 00 72 0b 48 83 e1 fc  H..H......r.H...	<==
  48 85 c9 75 16 eb 22 48-83 e1 fc 48 8d 15 2b 90  H..u.."H...H..+.
  01 00 48 8b 0c 4a 48 85-c9 74 0e 0f b6 51 14 31  ..H..JH..t...Q.1
  c0 48 39 74 d1 48 0f 94-c0 5d c3 66 90 55 48 89  .H9t.H...].f.UH.
  e5 31 c0 48 85 ff 74 2d-48 8b 0f 48 81 f9 fd 03  .1.H..t-H..H....
  00 00 72 23 48 83 e1 fc-48 81 fe fd 03 00 00 73  ..r#H...H......s

Binary Images:
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       0x105f4d000 -        0x105f50fff _QuickLookUI.so (*) <a334d3bb-0bdc-383d-969d-db8829673982> /Applications/Xpra.app/Contents/Resources/lib/python3.11/lib-dynload/Quartz/QuickLookUI/_QuickLookUI.so
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       0x109d5e000 -        0x10a19dfff libcrypto.3.dylib (*) <81797756-ce58-3a99-9156-19f354d6f3bd> /Applications/Xpra.app/Contents/Resources/lib/libcrypto.3.dylib
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       0x105fdf000 -        0x105feafff membuf.cpython-311-darwin.so (*) <29d34f4c-8c07-31d2-b095-c3a653ad9f19> /Applications/Xpra.app/Contents/Resources/lib/python3.11/xpra/buffers/membuf.cpython-311-darwin.so
       0x106144000 -        0x10614ffff errorchecker.cpython-311-darwin.so (*) <6dfcf8bf-6311-3233-90d2-ad4874ae73a1> /Applications/Xpra.app/Contents/Resources/lib/python3.11/OpenGL_accelerate/errorchecker.cpython-311-darwin.so
       0x1061ad000 -        0x1061e0fff arraydatatype.cpython-311-darwin.so (*) <8f6f1338-c763-34cf-8b87-0bd9d3b0fba9> /Applications/Xpra.app/Contents/Resources/lib/python3.11/OpenGL_accelerate/arraydatatype.cpython-311-darwin.so
       0x1064a0000 -        0x1064dbfff wrapper.cpython-311-darwin.so (*) <ae188082-0254-30bf-95a2-39b4626fcbff> /Applications/Xpra.app/Contents/Resources/lib/python3.11/OpenGL_accelerate/wrapper.cpython-311-darwin.so
       0x106179000 -        0x106188fff formathandler.cpython-311-darwin.so (*) <ecbecfcb-5895-3ff4-89bd-b0bd8c4d03b0> /Applications/Xpra.app/Contents/Resources/lib/python3.11/OpenGL_accelerate/formathandler.cpython-311-darwin.so
       0x10615c000 -        0x106167fff latebind.cpython-311-darwin.so (*) <87376a87-7c4c-314e-91f9-acf0c9ae6a05> /Applications/Xpra.app/Contents/Resources/lib/python3.11/OpenGL_accelerate/latebind.cpython-311-darwin.so
       0x106235000 -        0x106254fff vbo.cpython-311-darwin.so (*) <83c9762d-4759-3cde-8e89-58bb144e6b8d> /Applications/Xpra.app/Contents/Resources/lib/python3.11/OpenGL_accelerate/vbo.cpython-311-darwin.so
       0x106201000 -        0x10620cfff gdk3_bindings.cpython-311-darwin.so (*) <18ffa57c-0c4a-3d7b-adbd-63c1af9486cd> /Applications/Xpra.app/Contents/Resources/lib/python3.11/xpra/platform/darwin/gdk3_bindings.cpython-311-darwin.so
       0x108dee000 -        0x108e01fff gdk_bindings.cpython-311-darwin.so (*) <e1319c58-558c-3511-9843-de7dd747872b> /Applications/Xpra.app/Contents/Resources/lib/python3.11/xpra/gtk_common/gtk3/gdk_bindings.cpython-311-darwin.so
       0x106219000 -        0x106228fff libobjc-trampolines.dylib (*) <5eaf78f9-49d0-30e2-a516-d53697b7344a> /usr/lib/libobjc-trampolines.dylib
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External Modification Summary:
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  Calls made by this process:
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  Calls made by all processes on this machine:
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VM Region Summary:
ReadOnly portion of Libraries: Total=827.3M resident=0K(0%) swapped_out_or_unallocated=827.3M(100%)
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__TEXT                           639.

[totaam]

That's the OpenGL probe doing the sanity checks, the client will continue with the slower software rendering when that fails.
It would be nice to be able to tell macos that we don't want the crashreporter to show up, since we're doing a test and we know it may well crash. But apparently, this cannot be done for a specific application: Mac OS X: prevent the crash report window from appearing in my app.

---

We should have a new backend available in version 6, hopefully compatible with more hardware: #2467

---

Also note that the warning should give you the option of skipping the opengl probing.
If that doesn't appear, I will also need to figure out why.

[totaam]

Good news of sorts: I was making builds to test the new opengl renderer (--opengl=gtk) and although this one does not render anything at all (at least not yet, hopefully), I did hit the same crash that you did when running with the old one (--opengl=native).
This is good news because it means that I should be able to figure out why it is crashing.
OTOH: window.destroy or something libffi.

[totaam]

Good news all round:

• the new opengl backend now runs properly on macos
• the old one (which is still used in v5.x) no longer crashes either (on my test system at least) - we do leak one window object now instead of destroying it, but I don't think that this is going to cause any real problems

@harry-xm you can find beta builds (6.0-r34702, 5.0.4-r69 or later) with these fixes (and many more) here: https://xpra.org/beta/MacOS/
Please close this ticket if that works for you.

[harry-xm]

Hi @totaam, I tried 6.0-r34709 on macOS 14.1.1 and the opengl process does not crash anymore ✨ , but the window is transparent and only the title bar is displayed.

[totaam]

Ah, that's not good!
Two things worth trying:

• add --opengl=gtk to your command line (or perhaps it should be --opengl=native? I can't remember which one is the default now)
• try 5.0.4 beta, which uses the old renderer

I don't have MacOS hardware to use for testing, so I don't know what's wrong.
I do know that Apple did mess with the OpenGL spec a bit.

[harry-xm]

• xpra attach --opengl=native can display the remote window, but has the following error.

2023-11-14 18:10:55,959 Error compiling 'vertex' OpenGL shader:
2023-11-14 18:10:55,959  ERROR: 0:2: '' :  version '330' is not supported
2023-11-14 18:10:55,959  ERROR: 0:2: '' : syntax error: #version
2023-11-14 18:10:55,959  ERROR: 0:3: 'layout' : syntax error: syntax error
2023-11-14 18:10:55,959 Error compiling 'vertex' OpenGL shader:
2023-11-14 18:10:55,959  ERROR: 0:2: '' :  version '330' is not supported
2023-11-14 18:10:55,959  ERROR: 0:2: '' : syntax error: #version
2023-11-14 18:10:55,959  ERROR: 0:3: 'layout' : syntax error: syntax error
2023-11-14 18:10:55,960 Error painting planar update
Traceback (most recent call last):
  File "/Applications/Xpra.app/Contents/Resources/lib/python/xpra/client/gl/backing.py", line 1271, in do_gl_paint_planar
    self.gl_init(context)
  File "/Applications/Xpra.app/Contents/Resources/lib/python/xpra/client/gl/backing.py", line 503, in gl_init
    self.gl_init_shaders()
  File "/Applications/Xpra.app/Contents/Resources/lib/python/xpra/client/gl/backing.py", line 386, in gl_init_shaders
    vertex_shader = self.gl_init_shader("vertex", GL_VERTEX_SHADER)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Applications/Xpra.app/Contents/Resources/lib/python/xpra/client/gl/backing.py", line 462, in gl_init_shader
    self.fail_shader(name, infolog)
  File "/Applications/Xpra.app/Contents/Resources/lib/python/xpra/client/gl/backing.py", line 443, in fail_shader
    raise RuntimeError(f"OpenGL failed to compile shader {name!r}: {nonl(err_str)}")
RuntimeError: OpenGL failed to compile shader 'vertex': ERROR: 0:2: '' :  version '330' is not supported\nERROR: 0:2: '' : syntax error: #version\nERROR: 0:3: 'layout' : syntax error: syntax error
2023-11-14 18:10:55,962  flush=0, image=ImageWrapper(YUV420P:(0, 0, 48, 48, 24):3), coords=(198, 130, 48, 48), size=48x48
2023-11-14 18:10:55,981 OpenGL test rendering failed:
2023-11-14 18:10:55,981  OpenGL jpeg paint failed: OpenGL failed to compile shader 'vertex': ERROR: 0:2: '' :  version '330' is not supported\nERROR: 0:2: '' : syntax error: #version\nERROR: 0:3: 'layout' : syntax error: syntax error

• xpra attach --opengl=gtk is the transparent one, with no errors in logs.

[totaam]

@harry-xm thanks, I need to figure out how to tell macos to use a core context, this should fix --opengl=native.
Why opengl=gtk is transparent is beyond me at this point, it works on MS Windows, X11, Wayland, etc..

[totaam]

Regarding the transparency issue, this may help: #3987 (comment) once we start making new macos builds again - blocked by Xpra-org/gtk-osx-build#27

[totaam]

Is this still an issue with the 6.0.1 builds? (or beta 6.1)

[totaam]

Not heard back, likely fixed as per: #4357