MainWindow deleteLater() segmentation fault

abarmotov

If this is RTFM, point me )
Create simple GUI App in Creator, append button and write in slot: deleteLater()
Run it, press this button - segmentation fault take place
In application output "double free or curruption" error shown
Ubuntu 16.04 64Bit, Qt 5.12.0 from offline installer

Christian Ehrlicher

Please show use you code.

abarmotov

This post is deleted!

abarmotov

void MainWindow::on_pushButton_clicked()
{
    deleteLater();
}

jsulm

@abarmotov Why do you do this?

abarmotov

@jsulm Why i cant ?
Is it unsafe to call QObject::deleteLater() here ?

jsulm

@abarmotov It is unusual that an object destroys itself. Can you explain why you're doing this?
The problem is (I guess your code looks like this):

void main()
{
    ...
    MainWindow window;
    ...
    app.exec();
    // Here window will be destroyed, but you call deleteLater() in in the slot -> double delete
}

abarmotov

@jsulm yes, forgot about main.cpp )

Christian Ehrlicher

So how does your main.cpp looks like? The same as jsulm posted? Then you must not call deleteLater() since you created MainWindow on the stack.

abarmotov

Yes, this is default project main.cpp, i failed to saw where double free occured. But now ok.