QT app crashes at the destructor of std::thread on Android 10 devices

Question

My app crashes on Android 10 devices with the following call stack:

backtrace:
#00  pc 000000000006f06c  /apex/com.android.runtime/lib64/bionic/libc.so (abort+160)
#01  pc 00000000000500fc  /system/lib64/libc++.so (abort_message+232)
#02  pc 0000000000050218  /system/lib64/libc++.so (demangling_terminate_handler()+44)
#03  pc 00000000000646c4  /system/lib64/libc++.so (std::__terminate(void (*)())+12)
#04  pc 000000000006466c  /system/lib64/libc++.so (std::terminate()+52)
#05  pc 00000000000bb150  /system/lib64/libc++.so (std::__1::thread::~thread()+20)
#06  pc 00000000000d0f48  /apex/com.android.runtime/lib64/bionic/libc.so (__cxa_finalize+212)
#07  pc 00000000000cc930  /apex/com.android.runtime/lib64/bionic/libc.so (exit+24)
#08  pc 0000000000032f30  /data/app/com.domain.myapp-Rs_sm5VrLR1Jj8QW6oYByA==/lib/arm64/libplugins_platforms_qtforandroid_arm64-v8a.so

I have no idea when and why this happens, because I can't reproduce this on my devices and emulators, but this intensively happens at the user side and only on Android 10 (not on previous Android versions).

My QT version is 5.14.2.

Answer 1

We've just released an update for one of our games and it looks as if the crash is fixed. This is what we did: Android 10 and Android 9 show a different default behaviour when using the Android back button. On Android 10 the app closes but on the console output I see the app being stuck in a loop for about 5 seconds before it really quits. This does not happen on Android 9. This is the output I get on an Android 10 device when I hit the back button and the app closes:

....
05-04 18:26:21.315 26882 26908 I nkeycat.tendow:
I nkeycat.tendow: QarthPatchMonintor::CheckNotifyEvent
05-04 18:26:21.315 26882 26908 I nkeycat.tendow:
I nkeycat.tendow: QarthPatchMonintor::CheckNotifyEvent before read
05-04 18:26:21.315 26882 26908 I nkeycat.tendow:
I nkeycat.tendow: QarthPatchMonintor::CheckNotifyEvent after read, length = -1
05-04 18:26:21.315 26882 26908 I nkeycat.tendow:
I nkeycat.tendow: QarthPatchMonintor::CheckNotifyEvent
05-04 18:26:21.315 26882 26908 I
...

I am now catching the Android back button everywhere In QML and when the user really wants to quit the app, I call the following custom Java function to quit gracefully:

public String quitApp() { // Qt C++ call

    try {
        finishAffinity();
        System.exit(0);

    } catch (Exception exc) {
        exc.printStackTrace();
        logException(exc);
    }
    return "";
}

We have also implemented the what David K. Hess suggested.