https://bugzilla.novell.com/show_bug.cgi?id=689489
https://bugzilla.novell.com/show_bug.cgi?id=689489#c0
Summary: Konqueror scrolling is rough and appears to freeze
sometimes, with high CPU load
Classification: openSUSE
Product: openSUSE 12.1
Version: Factory
Platform: x86-64
OS/Version: Other
Status: NEW
Severity: Normal
Priority: P5 - None
Component: KDE4 Applications
AssignedTo: kde-maintainers@suse.de
ReportedBy: vlukas@gmx.de
QAContact: qa@suse.de
Found By: ---
Blocker: ---
User-Agent: Mozilla/5.0 (compatible; Konqueror/4.6; Linux) KHTML/4.6.2
(like Gecko) SUSE
I am using KDE 4.6.2 straight from the Opensuse Factory distribution.
I experience a strange responsiveness problem with Konqueror: Scrolling appears
to be rough and under specific circumstances Konqueror appears to freeze
completely for many seconds, with high CPU usage. This problem is not about
animated or Javascript intensive web content, it happens on "plain" websites
(see "Steps to Reproduce"). Strangely, this only happens when I use the Qt
library, and some related libraries, from the main Opensuse-Factory repository
(http://download.opensuse.org/factory/repo/oss/). It does not happen when using
the Qt packages from
http://download.opensuse.org/repositories/KDE:/Qt47/openSUSE_Factory/.
The most recently published packages are not the only ones which are affected,
I saw the same behavior already in March this year: Packages from
http://download.opensuse.org/factory/repo/oss/ lead to the problem, those from
http://download.opensuse.org/repositories/KDE:/Qt47/openSUSE_Factory/ do not.
The problem might span back in time more, but I can not say definitely.
This is the full list of packages which, when changed between the two different
repositories, make the problem appear or disappear:
-----------------------------------------------------------
$rpm -qa | grep "libqt4\|qt4-x11\|qt4-qtscript\|QtWeb\|qca2" | sort
libqca2-2.0.2-13.2.x86_64
libqca2-debuginfo-2.0.2-13.2.x86_64
libqca2-debugsource-2.0.2-13.2.x86_64
libqca2-devel-2.0.2-13.2.x86_64
libqt4-4.7.2-7.1.x86_64
libqt4-debuginfo-4.7.2-7.1.x86_64
libqt4-debugsource-4.7.2-7.1.x86_64
libqt4-devel-4.7.2-7.1.x86_64
libqt4-devel-debuginfo-4.7.2-7.1.x86_64
libqt4-devel-doc-4.7.2-7.1.x86_64
libqt4-devel-doc-data-4.7.2-7.1.noarch
libqt4-devel-doc-debuginfo-4.7.2-7.1.x86_64
libqt4-devel-doc-debugsource-4.7.2-7.1.x86_64
libqt4-qt3support-4.7.2-7.1.x86_64
libqt4-sql-4.7.2-7.1.x86_64
libqt4-sql-debuginfo-4.7.2-7.1.x86_64
libqt4-sql-mysql-4.7.2-7.1.x86_64
libqt4-sql-sqlite-4.7.2-7.1.x86_64
libqt4-sql-sqlite-debuginfo-4.7.2-7.1.x86_64
libqt4-x11-4.7.2-7.1.x86_64
libqt4-x11-debuginfo-4.7.2-7.1.x86_64
libQtWebKit4-4.7.2-7.1.x86_64
libQtWebKit4-debuginfo-4.7.2-7.1.x86_64
libQtWebKit-devel-4.7.2-7.1.x86_64
qt4-qtscript-0.1.0-12.1.x86_64
qt4-x11-tools-4.7.2-7.1.x86_64
-----------------------------------------------------------
Note: It is sufficient to replace libqt4 and libqt4-x11 to trigger the problem,
but you have to force rpm to ignore package conflicts then.
Reproducible: Always
Steps to Reproduce:
1. Start Konqueror
2. Load http://download.opensuse.org/factory/repo/oss/suse/x86_64/
3. Click on the column heading "Last modified"
4. While the page loads, attempt to use the vertical scrollbar to scroll up and
down a few times.
5. After having tried to move the slider a bit, leave Konqueror alone.
Actual Results:
It can be observed, through the "top" command for example, that Konqueror uses
almost 100% CPU time, and continues to do so for some seconds, even when you
have stopped touching the scrollbar slider or the rest of the Konqueror UI in
any way. If you try to use Konqueror during the high CPU load phase, it will
react very slowly, i.e. it will eventually react to user input, but after a
much longer time then what can be considered reasonable.
Note that the exact length of time of high CPU load and unresponsiveness
depends on in what way you have used the scrollbar in step 4 of the "Steps to
Reproduce" list: If you give it only one quick pull, the phase will only last a
few seconds (in the one digit range). If you try to pull it up and down a few
times, the phase of unresponsiveness can last 30 seconds or more.
Expected Results:
After having stopped touching the Konqueror UI, CPU usage should drop almost
instantly (as it does when using the Qt packages from the "right" repository).
While reproducing this problem multiple times, I used gdb to obtain backtraces
during the phase in which Konqueror utilizes 100% CPU and noticed that
execution was always ultimately in the memset function when I took a sample.
Here is a sample backtrace:
-----------------------------------------------------------
$gdb /usr/bin/konqueror core.4156
[...]
Core was generated by `konqueror'.
#0 memset () at ../sysdeps/x86_64/memset.S:1048
1048 cmp $0x80,%r8
(gdb) bt
#0 memset () at ../sysdeps/x86_64/memset.S:1048
#1 0x00007fbba1d6630a in _int_free (av=0x7fbba205ae80, p=0x264dab0) at
malloc.c:4935
#2 0x00007fbba1d689f1 in _int_realloc (av=0x7fbba205ae80, oldp=0x2643c90,
oldsize=<optimized out>, nb=40480)
at malloc.c:5347
#3 0x00007fbba1d69032 in realloc_check (oldmem=0x2643ca0, bytes=40456,
caller=<optimized out>) at hooks.c:365
#4 0x00007fbb9ebbf374 in QVectorQPainterPath::Element::realloc
(this=0x2626258, asize=1680, aalloc=1685)
at ../../src/corelib/tools/qvector.h:481
#5 0x00007fbb9ebc550c in QVectorQPainterPath::Element::reserve
(this=0x2626258, asize=<optimized out>)
at ../../src/corelib/tools/qvector.h:328
#6 0x00007fbb9ebed920 in QPainterPath::addRect (this=0x7fff5854d100, r=...) at
painting/qpainterpath.cpp:967
#7 0x00007fbb9ec905c3 in path_for_glyphs (ft=0xcaf750, positions=...,
glyphs=...)
at painting/qpaintengine_x11.cpp:2343
#8 QX11PaintEngine::drawFreetype (this=0xb555d0, p=<optimized out>,
ti=<optimized out>)
at painting/qpaintengine_x11.cpp:2462
#9 0x00007fbb9ebe13eb in QPainter::drawTextItem (this=0x7fff58552420, p=...,
_ti=...)
at painting/qpainter.cpp:6547
#10 0x00007fbb9ebe5229 in QPainter::drawText (this=0x7fff58552420, p=...,
str=<optimized out>,
tf=<optimized out>, justificationPadding=<optimized out>) at
painting/qpainter.cpp:6030
#11 0x00007fbb90ccc03f in drawText (s=..., y=1869, x=80, this=0x7fff58552420)
at /usr/include/QtGui/qpainter.h:957
#12 drawDirectedText (str=..., y=1869, x=80, d=Qt::LeftToRight,
p=0x7fff58552420)
at /usr/src/debug/kdelibs-4.6.2/khtml/rendering/font.cpp:95
#13 khtml::Font::drawText (this=0xc8f208, p=0x7fff58552420, x=80, y=1869,
str=0xdd3f00, slen=32, pos=0, len=32,
toAdd=0, d=Qt::LeftToRight, from=-1, to=-1, bg=..., uy=-1, h=-1, deco=0)
at /usr/src/debug/kdelibs-4.6.2/khtml/rendering/font.cpp:148
#14 0x00007fbb90c94af7 in khtml::InlineTextBox::paint (this=0x17e1a58, i=...,
tx=50, ty=147)
at /usr/src/debug/kdelibs-4.6.2/khtml/rendering/render_text.cpp:181
#15 0x00007fbb90cd16a3 in khtml::InlineFlowBox::paint (this=0x17e1ab8, i=...,
tx=50, ty=147)
at /usr/src/debug/kdelibs-4.6.2/khtml/rendering/render_line.cpp:874
#16 0x00007fbb90cd16a3 in khtml::InlineFlowBox::paint (this=0x17e1960, i=...,
tx=50, ty=147)
at /usr/src/debug/kdelibs-4.6.2/khtml/rendering/render_line.cpp:874
#17 0x00007fbb90cd17b9 in khtml::RootInlineBox::paint (this=0x17e1960, i=...,
tx=50, ty=147)
at /usr/src/debug/kdelibs-4.6.2/khtml/rendering/render_line.cpp:1182
#18 0x00007fbb90c9254e in khtml::RenderFlow::paintLines (this=<optimized out>,
i=..., _tx=50, _ty=147)
at /usr/src/debug/kdelibs-4.6.2/khtml/rendering/render_flow.cpp:389
---Type <return> to continue, or q <return> to quit---
#19 0x00007fbb90c6c80d in khtml::RenderBlock::paintObject (this=0xbaf350,
pI=..., _tx=50, _ty=147,
shouldPaintOutline=true) at
/usr/src/debug/kdelibs-4.6.2/khtml/rendering/render_block.cpp:1797
#20 0x00007fbb90c6c939 in khtml::RenderBlock::paintObject (this=0xbaeb18,
pI=..., _tx=50, _ty=96,
shouldPaintOutline=true) at
/usr/src/debug/kdelibs-4.6.2/khtml/rendering/render_block.cpp:1801
#21 0x00007fbb90c6c939 in khtml::RenderBlock::paintObject (this=0xbae928,
pI=..., _tx=50, _ty=50,
shouldPaintOutline=true) at
/usr/src/debug/kdelibs-4.6.2/khtml/rendering/render_block.cpp:1801
#22 0x00007fbb90c6c939 in khtml::RenderBlock::paintObject (this=0xbae7a8,
pI=..., _tx=0, _ty=0,
shouldPaintOutline=true) at
/usr/src/debug/kdelibs-4.6.2/khtml/rendering/render_block.cpp:1801
#23 0x00007fbb90c9c6c6 in khtml::RenderLayer::paintLayer (this=0xbae870,
rootLayer=0xbae6f0, p=0x7fff58552420,
paintDirtyRect=..., selectionOnly=false) at
/usr/src/debug/kdelibs-4.6.2/khtml/rendering/render_layer.cpp:1126
#24 0x00007fbb90c9c476 in khtml::RenderLayer::paintLayer (this=0xbae6f0,
rootLayer=0xbae6f0, p=0x7fff58552420,
paintDirtyRect=..., selectionOnly=false) at
/usr/src/debug/kdelibs-4.6.2/khtml/rendering/render_layer.cpp:1151
#25 0x00007fbb90b2ffd4 in KHTMLView::paintEvent (this=0xa54c20, e=<optimized
out>)
at /usr/src/debug/kdelibs-4.6.2/khtml/khtmlview.cpp:917
#26 0x00007fbb9eae4bfe in QWidget::event (this=0xa54c20, event=0x7fff58552dc0)
at kernel/qwidget.cpp:8405
#27 0x00007fbb9ee89796 in QFrame::event (this=0xa54c20, e=0x7fff58552dc0) at
widgets/qframe.cpp:557
#28 0x00007fbb90b28325 in KHTMLView::widgetEvent (this=0xa54c20, e=<optimized
out>)
at /usr/src/debug/kdelibs-4.6.2/khtml/khtmlview.cpp:2208
#29 0x00007fbb90b286c4 in KHTMLView::eventFilter (this=0xa54c20, o=0xa6aa60,
e=0x7fff58552dc0)
at /usr/src/debug/kdelibs-4.6.2/khtml/khtmlview.cpp:2053
#30 0x00007fbb9f9426e7 in
QCoreApplicationPrivate::sendThroughObjectEventFilters (this=<optimized out>,
receiver=
0xa6aa60, event=0x7fff58552dc0) at kernel/qcoreapplication.cpp:846
#31 0x00007fbb9ea930f1 in QApplicationPrivate::notify_helper (this=0x630980,
receiver=0xa6aa60, e=0x7fff58552dc0)
at kernel/qapplication.cpp:4458
#32 0x00007fbb9ea9b6ca in QApplication::notify (this=<optimized out>,
receiver=0xa6aa60, e=0x7fff58552dc0)
at kernel/qapplication.cpp:4341
#33 0x00007fbba02a4d46 in KApplication::notify (this=0x7fff58555790,
receiver=0xa6aa60, event=0x7fff58552dc0)
at /usr/src/debug/kdelibs-4.6.2/kdeui/kernel/kapplication.cpp:311
#34 0x00007fbb9f94255c in QCoreApplication::notifyInternal
(this=0x7fff58555790, receiver=0xa6aa60, event=
0x7fff58552dc0) at kernel/qcoreapplication.cpp:731
#35 0x00007fbb9eae1ad2 in sendSpontaneousEvent (event=0x7fff58552dc0,
receiver=0xa6aa60)
at ../../src/corelib/kernel/qcoreapplication.h:218
#36 QWidgetPrivate::drawWidget (this=0xa87c50, pdev=0xad9548, rgn=...,
offset=..., flags=4, sharedPainter=0x0,
backingStore=0xad94b0) at kernel/qwidget.cpp:5492
---Type <return> to continue, or q <return> to quit---
#37 0x00007fbb9eca47a8 in QWidgetBackingStore::sync (this=0xad94b0) at
painting/qbackingstore.cpp:1325
#38 0x00007fbb9ead76d0 in QWidgetPrivate::syncBackingStore (this=0x70c320) at
kernel/qwidget.cpp:1842
#39 0x00007fbb9eae5102 in QWidget::event (this=0x715950, event=0x7fff58553da0)
at kernel/qwidget.cpp:8552
#40 0x00007fbb9eea336b in QMainWindow::event (this=0x715950,
event=0x7fff58553da0) at widgets/qmainwindow.cpp:1480
#41 0x00007fbba034db73 in KXmlGuiWindow::event (this=0x715950,
ev=0x7fff58553da0)
at /usr/src/debug/kdelibs-4.6.2/kdeui/xmlgui/kxmlguiwindow.cpp:126
#42 0x00007fbba20d88fc in KonqMainWindow::event (this=0x715950,
e=0x7fff58553da0)
at /usr/src/debug/kdebase-4.6.2/konqueror/src/konqmainwindow.cpp:5522
#43 0x00007fbb9ea93124 in QApplicationPrivate::notify_helper (this=0x630980,
receiver=0x715950, e=0x7fff58553da0)
at kernel/qapplication.cpp:4462
#44 0x00007fbb9ea9b6ca in QApplication::notify (this=<optimized out>,
receiver=0x715950, e=0x7fff58553da0)
at kernel/qapplication.cpp:4341
#45 0x00007fbba02a4d46 in KApplication::notify (this=0x7fff58555790,
receiver=0x715950, event=0x7fff58553da0)
at /usr/src/debug/kdelibs-4.6.2/kdeui/kernel/kapplication.cpp:311
#46 0x00007fbb9f94255c in QCoreApplication::notifyInternal
(this=0x7fff58555790, receiver=0x715950, event=
0x7fff58553da0) at kernel/qcoreapplication.cpp:731
#47 0x00007fbb9eca1329 in sendEvent (event=0x7fff58553da0, receiver=0x715950)
at ../../src/corelib/kernel/qcoreapplication.h:215
#48 sendUpdateRequest (updateImmediately=true, widget=0x715950) at
painting/qbackingstore.cpp:507
#49 QWidgetBackingStore::markDirty (this=0xad94b0, rect=<optimized out>,
widget=<optimized out>,
updateImmediately=true, invalidateBuffer=<optimized out>) at
painting/qbackingstore.cpp:695
#50 0x00007fbb9ead6f38 in QWidget::repaint (this=0xa54be0, rect=...) at
kernel/qwidget.cpp:10322
#51 0x00007fbb9eed7880 in QScrollBarPrivate::stopRepeatAction (this=<optimized
out>) at widgets/qscrollbar.cpp:296
#52 0x00007fbb9eae4c4c in QWidget::event (this=0xa54be0, event=0x7fff585548e0)
at kernel/qwidget.cpp:8259
#53 0x00007fbb9eed8302 in QScrollBar::event (this=0xa54be0,
event=0x7fff585548e0) at widgets/qscrollbar.cpp:546
#54 0x00007fbb9ea93124 in QApplicationPrivate::notify_helper (this=0x630980,
receiver=0xa54be0, e=0x7fff585548e0)
at kernel/qapplication.cpp:4462
#55 0x00007fbb9ea9bf4a in QApplication::notify (this=<optimized out>,
receiver=0xa54be0, e=0x7fff585548e0)
at kernel/qapplication.cpp:4023
#56 0x00007fbba02a4d46 in KApplication::notify (this=0x7fff58555790,
receiver=0xa54be0, event=0x7fff585548e0)
at /usr/src/debug/kdelibs-4.6.2/kdeui/kernel/kapplication.cpp:311
#57 0x00007fbb9f94255c in QCoreApplication::notifyInternal
(this=0x7fff58555790, receiver=0xa54be0, event=
0x7fff585548e0) at kernel/qcoreapplication.cpp:731
#58 0x00007fbb9ea94135 in sendEvent (event=<optimized out>, receiver=<optimized
out>)
---Type <return> to continue, or q <return> to quit---
at ../../src/corelib/kernel/qcoreapplication.h:215
#59 QApplicationPrivate::sendMouseEvent (receiver=0xa54be0,
event=0x7fff585548e0, alienWidget=0xa54be0,
nativeWidget=0x715950, buttonDown=0x7fbb9f565198, lastMouseReceiver=...,
spontaneous=true)
at kernel/qapplication.cpp:3122
#60 0x00007fbb9eb12b48 in QETWidget::translateMouseEvent (this=0x715950,
event=<optimized out>)
at kernel/qapplication_x11.cpp:4461
#61 0x00007fbb9eb11229 in QApplication::x11ProcessEvent (this=0x7fff58555790,
event=0x7fff58555240)
at kernel/qapplication_x11.cpp:3587
#62 0x00007fbb9eb38ee2 in x11EventSourceDispatch (s=0x6356b0, callback=0,
user_data=0x0)
at kernel/qguieventdispatcher_glib.cpp:146
#63 0x00007fbb9a4dcbd3 in g_main_dispatch (context=0x634840) at gmain.c:2440
#64 g_main_context_dispatch (context=0x634840) at gmain.c:3013
#65 0x00007fbb9a4dd3b0 in g_main_context_iterate (context=0x634840, block=1,
dispatch=1, self=<optimized out>)
at gmain.c:3091
#66 0x00007fbb9a4dd650 in g_main_context_iteration (context=0x634840,
may_block=1) at gmain.c:3154
#67 0x00007fbb9f96d31f in QEventDispatcherGlib::processEvents (this=0x60d240,
flags=<optimized out>)
at kernel/qeventdispatcher_glib.cpp:422
#68 0x00007fbb9eb38b7e in QGuiEventDispatcherGlib::processEvents
(this=<optimized out>, flags=<optimized out>)
at kernel/qguieventdispatcher_glib.cpp:204
#69 0x00007fbb9f941992 in QEventLoop::processEvents (this=<optimized out>,
flags=...) at kernel/qeventloop.cpp:149
#70 0x00007fbb9f941ba5 in QEventLoop::exec (this=0x7fff58555560, flags=...) at
kernel/qeventloop.cpp:201
#71 0x00007fbb9f94600b in QCoreApplication::exec () at
kernel/qcoreapplication.cpp:1008
#72 0x00007fbba211337a in kdemain (argc=<optimized out>, argv=<optimized out>)
at /usr/src/debug/kdebase-4.6.2/konqueror/src/konqmain.cpp:219
#73 0x00007fbba1d10bfd in __libc_start_main (main=0x400770