ubuntu-sdk-bugs team mailing list archive

[Michael Sheldon <michael.sheldon@xxxxxxxxxxxxx>]

Public bug reported:

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 /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
(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 /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007ffff6f46bf9 in QMetaCallEvent::~QMetaCallEvent() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007ffff6f46c79 in QMetaCallEvent::~QMetaCallEvent() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#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 /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007ffff6f1ed12 in QCoreApplication::~QCoreApplication() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x0000000000449bbc in main (argc=1, argv=<optimised out>) at /home/mike/src/udm/fix-1628635/tests/downloads/daemon/test_mms_download.cpp:97

This commit seems especially relevant: https://codereview.qt-
project.org/#/c/172173/

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:
https://bugs.launchpad.net/ubuntu/+source/webbrowser-app/+bug/1630765

Possibly another similar crash in ~QNetworkSession:
https://bugs.launchpad.net/ubuntu/+source/webbrowser-app/+bug/1630510

** Affects: qtbase-opensource-src (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1630941

Title:
  Crash at shutdown in ~QNetworkConfiguration

Status in qtbase-opensource-src package in Ubuntu:
  New

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 /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
  (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 /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
  #2  0x00007ffff6f46bf9 in QMetaCallEvent::~QMetaCallEvent() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
  #3  0x00007ffff6f46c79 in QMetaCallEvent::~QMetaCallEvent() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
  #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 /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
  #8  0x00007ffff6f1ed12 in QCoreApplication::~QCoreApplication() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
  #9  0x0000000000449bbc in main (argc=1, argv=<optimised out>) at /home/mike/src/udm/fix-1628635/tests/downloads/daemon/test_mms_download.cpp:97

  This commit seems especially relevant: https://codereview.qt-
  project.org/#/c/172173/

  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:
  https://bugs.launchpad.net/ubuntu/+source/webbrowser-app/+bug/1630765

  Possibly another similar crash in ~QNetworkSession:
  https://bugs.launchpad.net/ubuntu/+source/webbrowser-app/+bug/1630510

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