[Android] Crash in QNetworkAccessManager::get()

In user application there is a crash in libQt5Network.so!_ZN21QNetworkAccessManager3getERK15QNetworkRequest.

Periodically there are lines in log indicating locked mutex being destroyed.

Destroying locked mutex (:0) 
Destroyed while thread is still running (:0) 

Unfortunately no test application exists at the moment so the bug report is purely to get the stack trace of the crash published.

All crashes are from Android 5.x (most of them from 5.1.1 and others from 5.0.2,
5.1, 5.0, 5.0.1).