PyFinalize crash when mixing sip and PyQt-Builder extensions?

[Patrick Stinson]

I read somewhere on SO that this may have something to do with the qt
library's finalizer being called before the pyqt finalizer, resulting in a
double free()?

On Tue, Oct 25, 2022 at 8:39 AM Patrick Stinson <patrickkidd at gmail.com>
wrote:

> I am getting a crash on exit when I include both my basic sip extension
> and PyQt-Builder extension. If I A) only import my pure sip extension in
> python and not the PyQt-Builder extension, or B) change the sip extension
> builder to PyQt-Builder, it doesn't crash. Import order doesn't matter.
> PyQt-5.15.7, python-3.10
>
> The macOS Crash Report says:
>
> Thread 0 Crashed::  Dispatch queue: com.apple.main-thread
> 0   libsystem_kernel.dylib            0x7ff80be2b00e __pthread_kill + 10
> 1   libsystem_pthread.dylib          0x7ff80be611ff pthread_kill + 263
> 2   libsystem_c.dylib                0x7ff80bdacd24 abort + 123
> 3   libsystem_malloc.dylib            0x7ff80bc8a357 malloc_vreport + 551
> 4   libsystem_malloc.dylib            0x7ff80bc8d52b malloc_report + 151
> 5   Family Diagram                       0x1071ee985 _PyObject_Free + 165
> 6   Family Diagram                       0x107359e71 finalise + 177
> 7   Family Diagram                       0x1072e8bd9 Py_FinalizeEx + 409
> 8   Family Diagram                       0x106b2d776 pyqtdeploy_start(int,
> char**, _inittab*, char const*, char const*, char const**) + 1862
> (pyqtdeploy_start.cpp:236)
> 9   dyld                                 0x1147cc52e start + 462
>
> It's complaining about a pointer being freed that wasn't allocated.
>
> I'm not sure where to start with that stack trace. I'd just change the
> project builder on the pre sip extension but it's shared with a server
> process and I need to avoid a Qt/qmake dependency.
>
> Cheers,
> -Patrick
>
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