filelight crashed with SIGSEGV in operator&() on closing lid

[Fenyvesi Attila]

Closing the laptop lid (HP Probook 6470b) causes Qt-based programmes to crash.
Similar bug reports:
vlc - https://bugs.launchpad.net/bugs/1572313
texmaker - https://bugs.launchpad.net/bugs/1520826

ProblemType: Crash
DistroRelease: Ubuntu 15.10
Package: filelight 4:15.08.2-0ubuntu1
ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
Uname: Linux 4.2.0-35-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CurrentDesktop: XFCE
Date: Wed Apr 20 02:35:11 2016
ExecutablePath: /usr/bin/filelight
InstallationDate: Installed on 2014-12-04 (502 days ago)
InstallationMedia: Xubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
ProcCmdline: filelight
SegvAnalysis:
 Segfault happened at: 0x7fa5a81f4271 <_ZN14QWidgetPrivate10drawWidgetEP12QPaintDeviceRK7QRegionRK6QPointiP8QPainterP19QWidgetBackingStore+2961>: mov 0x28(%rax),%rax
 PC (0x7fa5a81f4271) ok
 source "0x28(%rax)" (0x00000028) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: filelight
StacktraceTop:
 QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
 QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
 QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
 QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
 QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
Title: filelight crashed with SIGSEGV in QWidgetPrivate::drawWidget()
UpgradeStatus: Upgraded to wily on 2016-02-05 (74 days ago)
UserGroups: adm audio cdrom dialout dip fuse lpadmin netdev plugdev sambashare scanner sudo video

[Fenyvesi Attila (fattila2)]

I listed the packages depending on libqt5core5a. vlc, texmaker and filelight crashes when I close the laptop lid.

[Apport retracing service (apport)]

StacktraceTop:
 operator& (f=<optimized out>, this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:136
 windowType (this=0x0) at ../../include/QtWidgets/../../src/widgets/kernel/qwidget.h:744
 isWindow (this=<optimized out>) at ../../include/QtWidgets/../../src/widgets/kernel/qwidget.h:752
 QWidgetPrivate::drawWidget (this=this@entry=0x13c4d10, pdev=pdev@entry=0x12b3390, rgn=..., offset=..., flags=flags@entry=4, sharedPainter=sharedPainter@entry=0x0, backingStore=0x14f3160) at kernel/qwidget.cpp:5552
 QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x13abc60, pdev=pdev@entry=0x12b3390, siblings=..., index=<optimized out>, index@entry=6, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x14f3160) at kernel/qwidget.cpp:5743

[Fenyvesi Attila (fattila2)]

Stellarium also crashes when closing the laptop lid. This file contains the terminal output of stellarium.

[Fenyvesi Attila (fattila2)]

Musescore also crashes when I close the lid. I ran it in debug mode (musescore -d)

[Fenyvesi Attila (fattila2)]

cantor and gwenview also crashes when closing the lid of the laptop.

[Timo Jyrinki (timo-jyrinki)]

There have been several notorious bugs throghout Qt 5.4, 5.5 and 5.6 development cycles that cause these kinds of crashes when monitors change or "disappear". Most Qt 5.6 fixes have been backported to the Ubuntu's Qt 5.5 version in 16.04 LTS, so it would be useful to upgrade to 16.04 LTS and see if the behavior would be better now.