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[Dmitry Shachnev <mitya57@xxxxxxxxx>]

** Also affects: qtbase-opensource-src (Ubuntu Disco)
   Importance: Undecided
       Status: New

** Changed in: qtbase-opensource-src (Ubuntu Bionic)
       Status: Confirmed => In Progress

** Changed in: qtbase-opensource-src (Ubuntu Disco)
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/1833536

Title:
  QuiteRSS crashes intermittently

Status in qtbase-opensource-src package in Ubuntu:
  Fix Released
Status in qtbase-opensource-src source package in Bionic:
  In Progress
Status in qtbase-opensource-src source package in Disco:
  In Progress

Bug description:
  [Impact]
  This bug affects QuiteRSS and other Qt applications, like plasma-discover (see https://bugs.kde.org/show_bug.cgi?id=402848) and qbittorrent (see bug 1814375). All they crash with similar stack traces.

  [Test Case]
  1. Open QuiteRSS.
  2. Leave it running for several hours.
  3. It should not crash.

  [Proposed Fix]
  The proposed fix is a backport of the following commit from upstream 5.12 branch: https://code.qt.io/cgit/qt/qtbase.git/commit/?id=e431a3ac027915db

  [Regression Potential]
  This patch adds an additional check before re-sending the request. Regressions chance is minimal, but the potential regressions may be that the request is not re-sent where it was re-sent with the previous code.

  [Original Description]
  After opening QuiteRSS it will run until crash happens.  This happens intermittently within the hour usually.

  (gdb) bt
  #0  QHttpNetworkConnectionChannel::sendRequest (this=<optimized out>)
      at access/qhttpnetworkconnectionchannel.cpp:238
  #1  0x00007ffff30deca2 in QHttpNetworkConnectionPrivate::_q_startNextRequest (
      this=0x7fff480d4a20) at access/qhttpnetworkconnection.cpp:1015
  #2  0x00007ffff2736122 in QObject::event (this=0x7fff48da89b0,
      e=<optimized out>) at kernel/qobject.cpp:1247
  #3  0x00007ffff6f2482c in QApplicationPrivate::notify_helper(QObject*, QEvent*)
      () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
  #4  0x00007ffff6f2c0f4 in QApplication::notify(QObject*, QEvent*) ()
     from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
  #5  0x00007ffff27069a8 in QCoreApplication::notifyInternal2 (
      receiver=0x7fff48da89b0, event=event@entry=0x7fff494233b0)
      at kernel/qcoreapplication.cpp:1024
  #6  0x00007ffff270911d in QCoreApplication::sendEvent (event=0x7fff494233b0,
      receiver=<optimized out>)
      at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:233
  #7  QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0,
      event_type=event_type@entry=0, data=0x7fff60008e90)
      at kernel/qcoreapplication.cpp:1699
  #8  0x00007ffff27096a8 in QCoreApplication::sendPostedEvents (
      receiver=receiver@entry=0x0, event_type=event_type@entry=0)
      at kernel/qcoreapplication.cpp:1553
  #9  0x00007ffff27602c3 in postEventSourceDispatch (s=0x7fff48003f10)
      at kernel/qeventdispatcher_glib.cpp:276
  #10 0x00007fffece96317 in g_main_context_dispatch ()
     from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #11 0x00007fffece96550 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #12 0x00007fffece965dc in g_main_context_iteration ()
     from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #13 0x00007ffff275f8ef in QEventDispatcherGlib::processEvents (
      this=0x7fff48000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:423
  #14 0x00007ffff27049ea in QEventLoop::exec (this=this@entry=0x7fff4fffec60,
      flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
  #15 0x00007ffff252322a in QThread::exec (this=<optimized out>)
      at thread/qthread.cpp:515
  #16 0x00007ffff252816d in QThreadPrivate::start (arg=0x7fff60008a20)
      at thread/qthread_unix.cpp:368
  #17 0x00007ffff22646db in start_thread (arg=0x7fff4ffff700)
      at pthread_create.c:463
  #18 0x00007ffff19ec88f in clone ()
      at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

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