[QGIS-Developer] Crashes on closing QGIS

[Andreas Neumann]

Hi, 

We always have crashes on closing QGIS (on Windows) - regardless of
version - it happens on 3.4, 3.6 and master. 

Seems to be related to the authentication manager. Is this a known
issue? Are there ideas how to fix the issue? 

Here is the crashlog: 

Crash ID: 0f25782d491a42462ec5c96af91c45b3e9859bd3

Stack Trace

QMutex::lock :
QMutexLocker::QMutexLocker :
::operator() qgsauthmanager.cpp:145
QtPrivate::FunctorCall,QtPrivate::List,void, >::call
qobjectdefs_impl.h:128
QtPrivate::Functor,0>::call,void> qobjectdefs_impl.h:239
QtPrivate::QFunctorSlotObject,0,QtPrivate::List,void>::impl
qobjectdefs_impl.h:427
QMetaObject::activate :
QThread::finished :
QThread::currentThreadId :
QThread::start :
BaseThreadInitThunk :
RtlUserThreadStart :

QGIS Info
QGIS Version: 3.7.0-Master
QGIS code revision: 5a85e206f6
Compiled against Qt: 5.11.2
Running against Qt: 5.11.2
Compiled against GDAL: 2.4.1
Running against GDAL: 2.4.1

System Info
CPU Type: x86_64
Kernel Type: winnt
Kernel Version: 6.1.7601
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