Details
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Bug
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Resolution: Done
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P1: Critical
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5.3.0, 5.3.1
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None
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MacOSX, maybe others too
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macOS
Description
Create a thread and call QImageReader::supportedImageFormats() from it.
This leads to overwritten memory and crashes on application exit.
I've attached a demo project reproducing the issue.
The important line is the following slot being called after pushing the surrounding worker object into a thread:
void work()
{
(void)QImageReader::supportedImageFormats();
emit done();
}
In this case the loading of the plugins is done within the thread's context. If you preload the plugins by calling QImageReader::supportedImageFormats(); from the main thread first everything seems to be ok - at least it does not crash within several minutes of running the code.
It's not happening all the time - only in some cases. This is why I've also created 2 bash files: calling the executable in multiple processes parallel. The crash should happen in about 10 seconds at least once.
> multirun.sh helloworld(32999,0x7fff72090310) malloc: *** error for object 0x7ff911e02ce8: incorrect checksum for freed object - object was probably modified after being freed. *** set a breakpoint in malloc_error_break to debug helloworld(34196,0x10ea81000) malloc: *** error for object 0x7f944a109fb8: incorrect checksum for freed object - object was probably modified after being freed. *** set a breakpoint in malloc_error_break to debug ./run.sh: line 6: 32999 Abort trap: 6 ../qt5test-build/helloworld helloworld(34602,0x7fff72090310) malloc: *** error for object 0x7fa722900688: incorrect checksum for freed object - object was probably modified after being freed. *** set a breakpoint in malloc_error_break to debug helloworld(34856,0x7fff72090310) malloc: *** error for object 0x7fb62b30a648: incorrect checksum for freed object - object was probably modified after being freed. *** set a breakpoint in malloc_error_break to debug
For me it's ok to preload the image formats - the issue I am having with this is that there is no warning. Nothing.
You just end up with memory corruption...
Attachments
Issue Links
- relates to
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- Closed
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