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List:       pykde
Subject:    Re: PyFinalize crash when mixing sip and PyQt-Builder extensions?
From:       Patrick Stinson <patrickkidd () gmail ! com>
Date:       2022-10-26 20:38:12
Message-ID: CADb17j0C1foL0ExZ+gxjfGxN+jGXVtSUV7zRfmdCjLsRkeqR=Q () mail ! gmail ! com
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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@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
>

[Attachment #3 (text/html)]

<div dir="ltr">I read somewhere on SO that this may have something to do with the qt \
library&#39;s finalizer being called before the pyqt finalizer, resulting in a double \
free()?</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, \
Oct 25, 2022 at 8:39 AM Patrick Stinson &lt;<a \
href="mailto:patrickkidd@gmail.com">patrickkidd@gmail.com</a>&gt; \
wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px \
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">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&#39;t crash. Import order doesn&#39;t matter. PyQt-5.15.7, \
python-3.10<div><br></div><div>The macOS Crash Report \
says:</div><div><br></div><div><font face="monospace">Thread 0 Crashed::   Dispatch \
queue: com.apple.main-thread<br>0    libsystem_kernel.dylib            	      \
0x7ff80be2b00e __pthread_kill + 10<br>1    libsystem_pthread.dylib          	      \
0x7ff80be611ff pthread_kill + 263<br>2    libsystem_c.dylib                   	      \
0x7ff80bdacd24 abort + 123<br>3    libsystem_malloc.dylib            	      \
0x7ff80bc8a357 malloc_vreport + 551<br>4    libsystem_malloc.dylib            	      \
0x7ff80bc8d52b malloc_report + 151<br>5    Family Diagram                        	    \
0x1071ee985 _PyObject_Free + 165<br>6    Family Diagram                        	      \
0x107359e71 finalise + 177<br>7    Family Diagram                        	          \
0x1072e8bd9 Py_FinalizeEx + 409<br>8    Family Diagram                        	       \
0x106b2d776 pyqtdeploy_start(int, char**, _inittab*, char const*, char const*, char \
const**) + 1862 (pyqtdeploy_start.cpp:236)<br>9    dyld                               \
0x1147cc52e start + 462</font><br></div><div><br></div><div>It&#39;s complaining \
about a pointer being freed that wasn&#39;t \
allocated.</div><div><br></div><div>I&#39;m not sure where to start with that stack \
trace. I&#39;d just change the project builder on the pre sip extension but it&#39;s \
shared with a server process and I need to avoid a Qt/qmake  \
dependency.<br></div><div><br></div><div>Cheers,</div><div>-Patrick</div></div> \
</blockquote></div>



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