*** This bug is a duplicate of bug 1630765 ***

** This bug has been marked a duplicate of bug 1630765
   webbrowser-app crashed with SIGSEGV in 

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  Crash at shutdown in ~QNetworkConfiguration

Status in qtbase-opensource-src package in Ubuntu:

Bug description:
  After the recent landing for bug 1618590 the Ubuntu Download Manager
  tests frequently crash at shutdown with the following stack trace:

  Thread 1 "test_mms_downlo" received signal SIGSEGV, Segmentation fault.
  0x00007ffff7201b23 in QNetworkConfiguration::~QNetworkConfiguration() () from 
  (gdb) bt
  #0  0x00007ffff7201b23 in QNetworkConfiguration::~QNetworkConfiguration() () 
from /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
  #1  0x00007ffff6f31169 in QMetaType::destroy(int, void*) () from 
  #2  0x00007ffff6f46bf9 in QMetaCallEvent::~QMetaCallEvent() () from 
  #3  0x00007ffff6f46c79 in QMetaCallEvent::~QMetaCallEvent() () from 
  #4  0x00007ffff6f1c9a8 in QCoreApplicationPrivate::cleanupThreadData() () 
from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
  #5  0x00007ffff6f1ca8a in QCoreApplicationPrivate::~QCoreApplicationPrivate() 
() from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
  #6  0x00007ffff6f1cba9 in QCoreApplicationPrivate::~QCoreApplicationPrivate() 
() from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
  #7  0x00007ffff6f510dc in QObject::~QObject() () from 
  #8  0x00007ffff6f1ed12 in QCoreApplication::~QCoreApplication() () from 
  #9  0x0000000000449bbc in main (argc=1, argv=<optimised out>) at 

  This commit seems especially relevant: https://codereview.qt-

  Neither this test, nor UDM itself make any explicit use of
  QPluginLoader, so this is unlikely to be a case of UDM incorrectly
  unloading a plugin itself.

  To reproduce simply run UDM's test_mms_download test a number of times
  (crashes only occur intermittently).

  When tested with a silo without the three patches added for bug
  1618590 this crash no-longer occurs.

  A similar crash appears to be happening in webbrowser-app as well:

  Possibly another similar crash in ~QNetworkSession:

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