[Xcb] Assertion failed: (pthreadret == 0), function _xcb_in_wake_up_next_reader, file xcb_in.c, line 926.

[Bart Massey]

Thanks much for the issue report? If you could also file this issue here
https://gitlab.freedesktop.org/xorg/lib/libxcb/-/issues that would be great.

I'm not sure what's going on with your issue: it appears that the
connection object is invalid at the time XPutImage() is called. Perhaps
the problem is related to
https://gitlab.freedesktop.org/xorg/lib/libxcb/-/issues/46 ?

I'm probably not going to have time to try to track this down super-soon.
Hopefully someone else here can reproduce it.

On Thu, Apr 16, 2020 at 8:11 AM Luigi Salvatore Esposito <
luigi.salvatore.esposito at cern.ch> wrote:

> Dear XCB developers,
>
> following the upgrade to libxcb 1.14, we have now a crash in one of our
> tools (http://flair.web.cern.ch/flair/)
> with the crash report at the bottom of this email.
> The problem appears at this line called in frame 11:
> XPutImage(self->display, self->pixmap, self->gc, self->ximage, 0, 0, 0, 0,
> width, height);
>
> Comparing with the libxcb 1.13, I managed to track down the issue to the
> variable “total_read” defined in xcbint.h.
> Indeed, with the attached patch the crash disappears.
>
> Do you have any suggestions how to fix the problem?
>
> For sake of completeness, libxcb is installed via MacPorts.
> If needed, I can provide additional details.
>
> Thanks a lot for your help
>
> ——————————————————————
> *Luigi Salvatore ESPOSITO *- CERN-EN/STI
> Esplanade des Particules
> CH-1211 Geneva 23
> O +41 22 76 63419
> ——————————————————————
>
>
> Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
> 0   libsystem_kernel.dylib         0x00007fff6da8733a __pthread_kill + 10
> 1   libsystem_pthread.dylib        0x00007fff6db43e60 pthread_kill + 430
> 2   libsystem_c.dylib              0x00007fff6da0e808 abort + 120
> 3   libsystem_c.dylib              0x00007fff6da0dac6 __assert_rtn + 314
> 4   libxcb.1.dylib                 0x00000001147c7746
> _xcb_in_wake_up_next_reader + 89
> 5   libxcb.1.dylib                 0x00000001147c6dd6 _xcb_out_send + 125
> 6   libxcb.1.dylib                 0x00000001147c6d3e xcb_writev + 68
> 7   libX11.6.dylib                 0x00000001157fe8f9 _XSend + 315
> 8   libX11.6.dylib                 0x00000001157f42c7 PutSubImage + 1924
> 9   libX11.6.dylib                 0x00000001157f3c8b PutSubImage + 328
> 10  libX11.6.dylib                 0x00000001157f385f XPutImage + 424
> *11  geoviewer.so                   0x0000000115689233
> Viewer_expose(ViewerObject*, _object*) + 163*
> 12  org.python.python              0x000000010df3eb26
> cfunction_call_varargs + 319
> 13  org.python.python              0x000000010dfd6b72
> _PyEval_EvalFrameDefault + 9050
> 14  org.python.python              0x000000010dfddeb9
> _PyEval_EvalCodeWithName + 2107
> 15  org.python.python              0x000000010df3ef21
> _PyFunction_Vectorcall + 217
> 16  org.python.python              0x000000010df40f56 method_vectorcall +
> 372
> 17  org.python.python              0x000000010df3e80d PyVectorcall_Call +
> 108
> 18  _tkinter.cpython-38-darwin.so  0x000000010e8c0012 PythonCmd + 205
> 19  libtcl8.6.dylib                0x000000010e8ddaee TclNRRunCallbacks +
> 79
> 20  libtcl8.6.dylib                0x000000010e8ded06 TclEvalEx + 1987
> 21  libtcl8.6.dylib                0x000000010e8de53d Tcl_EvalEx + 26
> 22  libtk8.6.dylib                 0x000000010ebff362 Tk_BindEvent + 5754
> 23  libtk8.6.dylib                 0x000000010ec04fe9 TkBindEventProc +
> 334
> 24  libtk8.6.dylib                 0x000000010ec0c523 Tk_HandleEvent + 997
> 25  libtk8.6.dylib                 0x000000010ec0cc0c WindowEventProc + 96
> 26  libtcl8.6.dylib                0x000000010e985e78 Tcl_ServiceEvent +
> 136
> 27  libtcl8.6.dylib                0x000000010e98606d Tcl_DoOneEvent + 153
> 28  _tkinter.cpython-38-darwin.so  0x000000010e8be324
> _tkinter_tkapp_mainloop + 342
> 29  org.python.python              0x000000010df45d4e
> method_vectorcall_FASTCALL + 250
> 30  org.python.python              0x000000010dfdd2f5 call_function + 346
> 31  org.python.python              0x000000010dfd66cd
> _PyEval_EvalFrameDefault + 7861
> 32  org.python.python              0x000000010dfddeb9
> _PyEval_EvalCodeWithName + 2107
> 33  org.python.python              0x000000010df3ef21
> _PyFunction_Vectorcall + 217
> 34  org.python.python              0x000000010df40e69 method_vectorcall +
> 135
> 35  org.python.python              0x000000010dfdd2f5 call_function + 346
> 36  org.python.python              0x000000010dfd66f0
> _PyEval_EvalFrameDefault + 7896
> 37  org.python.python              0x000000010dfddeb9
> _PyEval_EvalCodeWithName + 2107
> 38  org.python.python              0x000000010dfd4790 PyEval_EvalCode + 42
> 39  org.python.python              0x000000010e00c57d run_eval_code_obj +
> 102
> 40  org.python.python              0x000000010e00b9cb run_mod + 82
> 41  org.python.python              0x000000010e00a8a5 PyRun_FileExFlags +
> 160
> 42  org.python.python              0x000000010e009f89
> PyRun_SimpleFileExFlags + 271
> 43  org.python.python              0x000000010e021834 Py_RunMain + 1836
> 44  org.python.python              0x000000010e021b90 pymain_main + 370
> 45  org.python.python              0x000000010e021be5 Py_BytesMain + 42
> 46  libdyld.dylib                  0x00007fff6d93fcc9 start + 1
>
> _______________________________________________
> Xcb mailing list
> Xcb at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/xcb
>
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