[CRASH] QGraphicsView::mapFromScene buggy

[Alessandro Diaferia]

Hello my dear ML,
i'm fixing devicenotifier patch according to Aaron's suggestions but i
encounter a crash calling PopupApplet::showPopup(); The backtrace and my
tests say that the crash comes from Qt side, and it happens calling
QGraphicsView::mapFromScene, in particular from line 442 of my
popupapplet.cpp (PopupAppletPrivate::updateDialogPosition());

Along with this mail comes the device notifier patch.

Here instead comes the BT:

 Application: Plasma Workspace (plasma), signal SIGSEGV

Using host libthread_db library "/lib/libthread_db.so.1".

[Current thread is 0 (LWP 1037)]

Thread 2 (Thread 0xb2dd7b90 (LWP 1038)):

#0 0xb8069424 in __kernel_vsyscall ()

#1 0xb5f45be5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0

#2 0xb5fa3fc2 in QWaitCondition::wait (this=0x9cf5d30, mutex=0x9cf5d2c,
time=4294967295) at thread/qwaitcondition_unix.cpp:88

#3 0xb7dd508b in QHostInfoAgent::run (this=0x9cf5d20) at
kernel/qhostinfo.cpp:247

#4 0xb5fa2e59 in QThreadPrivate::start (arg=0x9cf5d20) at
thread/qthread_unix.cpp:191

#5 0xb5f42160 in start_thread () from /lib/libpthread.so.0

#6 0xb5c8fc0e in clone () from /lib/libc.so.6


 Thread 1 (Thread 0xb49b7730 (LWP 1037)):

[KCrash Handler]

*#6 0xb73bef70 in QGraphicsView::mapFromScene () from
/usr/lib/qt4/libQtGui.so.4*

*#7 0xb7f3549a in Plasma::PopupAppletPrivate::updateDialogPosition
(this=0x9b0ccc0) at
/var/tmp/paludis/kde-base-libplasma-scm/work/libplasma/libs/plasma/popupapplet.cpp:442
*

*#8 0xb7f36184 in Plasma::PopupApplet::showPopup (this=0x9b5ad48,
popupDuration=0) at
/var/tmp/paludis/kde-base-libplasma-scm/work/libplasma/libs/plasma/popupapplet.cpp:311
*

#9 0xb315e09e in DeviceNotifier::notifyDevice (this=0x9b5ad48,
name=@0x9dae9d8)

at
/var/tmp/paludis/kde-base-plasma-workspace-scm/work/plasma-workspace/plasma/applets/devicenotifier/devicenotifier.cpp:211

#10 0xb315e1da in DeviceNotifier::onSourceAdded (this=0x9b5ad48,
name=@0x9dae9d8)

at
/var/tmp/paludis/kde-base-plasma-workspace-scm/work/plasma-workspace/plasma/applets/devicenotifier/devicenotifier.cpp:257

#11 0xb315f130 in DeviceNotifier::fillPreviousDevices (this=0x9b5ad48) at
/var/tmp/paludis/kde-base-plasma-workspace-scm/work/plasma-workspace/plasma/applets/devicenotifier/devicenotifier.cpp:128

#12 0xb315f217 in DeviceNotifier::constraintsEvent (this=0x9b5ad48,
constraints={i = -1074254176})

at
/var/tmp/paludis/kde-base-plasma-workspace-scm/work/plasma-workspace/plasma/applets/devicenotifier/devicenotifier.cpp:106

#13 0xb7efc7d9 in Plasma::Applet::flushPendingConstraintsEvents
(this=0x9b5ad48) at
/var/tmp/paludis/kde-base-libplasma-scm/work/libplasma/libs/plasma/applet.cpp:890

#14 0xb7f18ba7 in Plasma::Corona::loadLayout (this=0x9acd3d8,
configName=@0xbff830c0) at
/var/tmp/paludis/kde-base-libplasma-scm/work/libplasma/libs/plasma/corona.cpp:308

#15 0xb7f18e33 in Plasma::Corona::initializeLayout (this=0x9acd3d8,
configName=@0xbff830c0) at
/var/tmp/paludis/kde-base-libplasma-scm/work/libplasma/libs/plasma/corona.cpp:252

#16 0xb80459e3 in PlasmaApp::corona (this=0x99c9128) at
/var/tmp/paludis/kde-base-plasma-workspace-scm/work/plasma-workspace/plasma/shells/desktop/plasmaapp.cpp:434

#17 0xb80477e8 in PlasmaApp (this=0x99c9128, display=0x99c0720,
visual=161251368, colormap=98566145)

at
/var/tmp/paludis/kde-base-plasma-workspace-scm/work/plasma-workspace/plasma/shells/desktop/plasmaapp.cpp:228

#18 0xb8048105 in PlasmaApp::self () at
/var/tmp/paludis/kde-base-plasma-workspace-scm/work/plasma-workspace/plasma/shells/desktop/plasmaapp.cpp:121

#19 0xb8038b11 in kdemain (argc=1, argv=0xbff83344) at
/var/tmp/paludis/kde-base-plasma-workspace-scm/work/plasma-workspace/plasma/shells/desktop/main.cpp:55

#20 0x080487af in main (argc=162901320, argv=0x9e19bb0) at
/var/tmp/paludis/kde-base-plasma-workspace-scm/work/plasma-workspace_build/plasma/shells/desktop/plasma_qgv_dummy.cpp:3

#21 0xb5bda635 in __libc_start_main () from /lib/libc.so.6

#22 0x080486f1 in _start ()


-- 
Alessandro Diaferia
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