QSerial memory leak

[Daniel Gutson]

Qt 5.2.1 has a serious memory leak: https://bugreports.qt-project.org/browse/QTBUG-37578
It is fixed in 5.2.2 as shown in the bug report.
Please update Qt for Ubuntu 14.04.
The bug turns custom applications unusable.
Thanks!

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: qt5-default 5.2.1+dfsg-1ubuntu14.2
ProcVersionSignature: Ubuntu 3.13.0-36.63-generic 3.13.11.6
Uname: Linux 3.13.0-36-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.4
Architecture: amd64
CurrentDesktop: GNOME
Date: Fri Oct 3 13:47:20 2014
InstallationDate: Installed on 2014-02-03 (242 days ago)
InstallationMedia: Ubuntu-GNOME 13.10 "Saucy Salamander" - Release amd64 (20131017)
SourcePackage: qtbase-opensource-src
UpgradeStatus: Upgraded to trusty on 2014-04-18 (167 days ago)

[Test Case]
We found the memory leak while running the QGroundControl (QGC) application, so the steps to reproduce are the following:

1- Install QGroundControl dependencies.
    sudo apt-get install git
    sudo apt-get install qtcreator
    sudo apt-get install qttools5-dev
    sudo apt-get install qtbase5-dev
    sudo apt-get install qt5-default
    sudo apt-get install qtdeclarative5-dev
    sudo apt-get install libqt5serialport5-dev
    sudo apt-get install libqt5svg5-dev
    sudo apt-get install libqt5webkit5-dev
    sudo apt-get install libsdl1.2-dev
    sudo apt-get install build-essential
    sudo apt-get install libudev-dev
    sudo apt-get install libsdl-dev
    sudo apt-get install phonon-backend-gstreamer
    sudo apt-get install libphonon4qt5-dev
    sudo apt-get install flite-dev
2- Checkout of QGroundControl.
    git clone https://github.com/mavlink/qgroundcontrol
3- Update QGroundControl Modules.
    cd qgroundcontrol
    git submodule init && git submodule update
4- Compile QGroundControl.
    qmake ./qgroundcontrol.pro
    make -j4
5- Run Application
    cd release
    ./qgroundcontrol
6- Select "Radio / Serial Link" option on the window of connection selection.
7- While the application is run, execute htop to see the rising on the allocated memory of QGC, about 1MB / sec.

[Dmitry Shachnev (mitya57)]

Thanks for your report. Can you please include a test case in the bug description? We need it in order to upload the update (see https://wiki.ubuntu.com/StableReleaseUpdates#Procedure).

[Daniel Gutson (daniel-gutson-9)]

Hi Dmitry, the (real life) test case we have is somewhat complex since it is an application running and seeing it eating RAM in top. The application itself requires a lot of dependencies plus getting source code and building it. Is this useful? Otherwise, if the upgrade can be guaranteed to be this week, we could invest some time creating a solo application specifically for this bug. Please take into account that we're on fire regarding some deadlines, so time is precious :) (I guess you are in the same situation ;) ).

[Gabriel Ibarra (gabriel-ibarra)]

Hi Dmitry, I added the steps to reproduce with the QGroundControl application, as Daniel said the real life test case, that's how we found the leak. I am at your disposal in case you need something else.

[Daniel Gutson (daniel-gutson-9)]

Hi,

  any update on this?

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.