Created attachment 107440 [details]
Test document that always reproduce the bug.

I'm using the debian experimental 3.0.1 package rebuilt for stretch.

When opening the attached file I get it looks like an infinite loop at RunAroundHelper::fit.

#0  RunAroundHelper::fit (this=this@entry=0x7ffd79884a80, resetHorizontalPosition=resetHorizontalPosition@entry=false, isRightToLeft=<optimized out>, position=...) at ./libs/textlayout/RunAroundHelper.cpp:106
#1  0x00007f64111318fc in KoTextLayoutArea::layoutBlock (this=this@entry=0x559f6942f300, cursor=cursor@entry=0x559f6941c4b0) at ./libs/textlayout/KoTextLayoutArea.cpp:1350
#2  0x00007f6411134b53 in KoTextLayoutArea::layout (this=this@entry=0x559f6942f300, cursor=cursor@entry=0x559f6941c4b0) at ./libs/textlayout/KoTextLayoutArea.cpp:689
#3  0x00007f641114bdbd in KoTextLayoutRootArea::layoutRoot (this=this@entry=0x559f6942f300, cursor=cursor@entry=0x559f6941c4b0) at ./libs/textlayout/KoTextLayoutRootArea.cpp:69
#4  0x00007f641114ed8d in KoTextDocumentLayout::doLayout (this=this@entry=0x559f69404ad0) at ./libs/textlayout/KoTextDocumentLayout.cpp:819
#5  0x00007f641114f618 in KoTextDocumentLayout::layout (this=0x559f69404ad0) at ./libs/textlayout/KoTextDocumentLayout.cpp:703
#6  0x00007f6411cd3499 in QObject::event (this=0x559f69404ad0, e=<optimized out>) at kernel/qobject.cpp:1263
#7  0x00007f6412050b8c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#8  0x00007f6412058341 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#9  0x00007f6412a8d3a7 in KoApplication::notify (this=<optimized out>, receiver=0x559f69404ad0, event=0x559f68ea3da0) at ./libs/main/KoApplication.cpp:657
#10 0x00007f6411ca69e0 in QCoreApplication::notifyInternal2 (receiver=0x559f69404ad0, event=event@entry=0x559f68ea3da0) at kernel/qcoreapplication.cpp:988
#11 0x00007f6411ca916d in QCoreApplication::sendEvent (event=0x559f68ea3da0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#12 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x559f68e2da00) at kernel/qcoreapplication.cpp:1649
#13 0x00007f6411ca95d8 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1503
#14 0x00007f6411cfac43 in postEventSourceDispatch (s=0x559f68e80030) at kernel/qeventdispatcher_glib.cpp:276
#15 0x00007f640b3b97f7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#16 0x00007f640b3b9a60 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#17 0x00007f640b3b9b0c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#18 0x00007f6411cfb04f in QEventDispatcherGlib::processEvents (this=0x559f68e958c0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#19 0x00007f640fe34cdb in KoProgressUpdater::update (this=<optimized out>) at ./libs/widgetutils/KoProgressUpdater.cpp:166
#20 0x00007f6411cd25e9 in QMetaObject::activate (sender=0x559f6932b2a0, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3740
#21 0x00007f6411cd25e9 in QMetaObject::activate (sender=sender@entry=0x559f693297e0, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x7ffd798854b0)
    at kernel/qobject.cpp:3740
#22 0x00007f6411cd2f07 in QMetaObject::activate (sender=sender@entry=0x559f693297e0, m=m@entry=0x7f6410042be0 <KoUpdater::staticMetaObject>, local_signal_index=local_signal_index@entry=1, 
    argv=argv@entry=0x7ffd798854b0) at kernel/qobject.cpp:3602
#23 0x00007f640fe3edc1 in KoUpdater::sigProgress (this=this@entry=0x559f693297e0, _t1=<optimized out>, _t1@entry=100)
    at ./obj-x86_64-linux-gnu/libs/widgetutils/kowidgetutils_automoc.dir/moc_KoUpdater_S7VTS5GQ4NKEZV.cpp:158
#24 0x00007f640fe36274 in KoUpdater::setProgress (this=0x559f693297e0, percent=percent@entry=100) at ./libs/widgetutils/KoUpdater.cpp:56
#25 0x00007f6412a96d7c in KoDocument::openFile (this=0x559f68e8b100) at ./libs/main/KoDocument.cpp:1610
#26 0x00007f6412a9e632 in KoDocument::Private::openFile (this=0x559f68f1a580) at ./libs/main/KoDocument.cpp:271
#27 KoDocument::Private::openLocalFile (this=0x559f68f1a580) at ./libs/main/KoDocument.cpp:293
#28 0x00007f6412a9cd0d in KoDocument::openUrlInternal (this=this@entry=0x559f68e8b100, url=file:///home/raul/debs/calligra/testdocs/t5/t5d.odt) at ./libs/main/KoDocument.cpp:2675
#29 0x00007f6412a9d050 in KoDocument::openUrl (this=0x559f68e8b100, _url=file:///home/raul/debs/calligra/testdocs/t5/t5d.odt) at ./libs/main/KoDocument.cpp:1241
#30 0x00007f6412aa32fb in KoMainWindow::openDocumentInternal (this=this@entry=0x559f68f8b7c0, url=file:///home/raul/debs/calligra/testdocs/t5/t5d.odt, newpart=newpart@entry=0x559f68f23700, 
    newdoc=newdoc@entry=0x559f68e8b100) at ./libs/main/KoMainWindow.cpp:759
#31 0x00007f6412aa4de9 in KoMainWindow::openDocument (this=this@entry=0x559f68f8b7c0, newPart=0x559f68f23700, url=file:///home/raul/debs/calligra/testdocs/t5/t5d.odt) at ./libs/main/KoMainWindow.cpp:738
#32 0x00007f6412a89563 in KoApplication::start (this=this@entry=0x7ffd79886060) at ./libs/main/KoApplication.cpp:570
#33 0x00007f64130dd28b in kdemain (argc=<optimized out>, argv=<optimized out>) at ./words/app/main.cpp:54
---Type <return> to continue, or q <return> to quit---
#34 0x00007f6412d5a2b1 in __libc_start_main (main=0x559f683f0ab0 <main>, argc=2, argv=0x7ffd798861b8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffd798861a8)
    at ../csu/libc-start.c:291
#35 0x0000559f683f0aea in _start ()

From a gdb session I got these:
(gdb) info locals
maxLineWidth = 467.77403871160004
maxLineHeight = <optimized out>
maxNaturalTextWidth = 0
lineRect = {
  xp = 0, 
  yp = 2318704676.6306496, 
  w = 467.77403871160004, 
  h = -2318703850
}
lineRectPart = {
  xp = 0, 
  yp = 2318704676.6306496, 
  w = 467.77403871160004, 
  h = 0
}
movedDown = 2318703860