Qt software debugging techniques

[Cobra91151]

Hi! I have the application which is published to the Microsoft Store, under health page for the application in the Dev center, it reports crash issue:

fail_fast_fatal_app_exit_c0000409_qt5core.dll!qt_logging_to_console

And stack trace:

0	ucrtbase.dll	abort	0x000000000000004E
1	Qt5Core.dll	qt_logging_to_console	0x000000000000017A
2	Qt5Core.dll	QMessageLogger::fatal	0x0000000000000093
3	Qt5Gui.dll	QPixmap::paintEngine	0x0000000000000052
4	Qt5Gui.dll	QPixmap::QPixmap	0x0000000000000037

When debugging the application I don't get any crashes. The question is how to get the crash location or function line/name in the code by the stack trace? Any ideas? Thanks.

[SGaist]

Hi,

If you have a crash in release mode and not in debug, check that you properly initialise all your pointer variables.

[Cobra91151]

@SGaist

Thanks, but the project is big and checking all pointer variables is not an option. I need at least name of source file or class to check for it.

[SGaist]

Out of curiosity, how big is that ?

[Cobra91151]

@SGaist

It's about 286 files.

[SGaist]

I feared it was a bigger number.

From you stack trace, it's QPixmap related, so you should start by checking the parts which are using or creating QPixmap.

[Cobra91151]

@SGaist

Ok. I will check it and reply later. Thanks.

[Cobra91151]

@SGaist

You was right. I think the problem was with programs icons creation/destruction on the fly and DestroyIcon destroyed the handle which was in use.

I added some improvements, now it only creates 1 object of HICON and QPixmap, then appends to the structure in the loop and after the loop exited it calls DestroyIcon function to destroy the HICON handle.

Also I have found this article about finding bugs from the Microsoft Store:
https://stackoverflow.com/questions/41527577/how-to-get-a-crash-dump-or-any-usable-crash-report-for-a-converted-windows-sto

But also I'm going to try StackWalker application to check for other issues. Thank you.