Application: okular (0.15.4)
KDE Platform Version: 4.9.4
Qt Version: 4.8.3
Operating System: Linux 3.5.0-23-generic x86_64
Distribution: Ubuntu 12.10

-- Information about the crash:
- What I was doing when the application crashed:

Tried to open the following path on my local hard drive: /home/ben/Downloads//[Jasmin_Blanchette,_Mark_Summerfield]_C++_GUI_Prog(BookFi.org).chm.
I simply downloaded it via rekonq and then got a notification in the KDE panel saying that the download was finished and the above URL was clickable in the Notifications widget (KDE panel). I just clicked on it and Okular got automatically invoked by KDE (I didn't do anything for this.) Then I got a pop-up windows with the error message: 'Malformed URL'. This pop-up kept re-opening when I closed it.  
So I right-clicked on the panel to close okular more forcefully and then I got that crash.

Notice: If I navigate to the directory '/home/ben/Downloads/' with Dolphin and then click on the file to open it, Okular then opens the file normally and displays its contents as expected.

100% reproducable.

-- Backtrace:
Application: Okular (okular), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7feb3aee4780 (LWP 26175))]

Thread 2 (Thread 0x7feb22eec700 (LWP 26177)):
#0  0x00007feb3520905d in __pthread_mutex_unlock_usercnt (mutex=<optimized out>, decr=<optimized out>) at pthread_mutex_unlock.c:52
#1  __pthread_mutex_unlock (mutex=0x7feb1c000a60) at pthread_mutex_unlock.c:290
#2  0x00007feb34d73e51 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007feb34d3660b in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007feb34d36cab in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007feb34d36ea4 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007feb38b32c16 in QEventDispatcherGlib::processEvents (this=0x7feb1c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#7  0x00007feb38b032bf in QEventLoop::processEvents (this=this@entry=0x7feb22eebdd0, flags=...) at kernel/qeventloop.cpp:149
#8  0x00007feb38b03548 in QEventLoop::exec (this=0x7feb22eebdd0, flags=...) at kernel/qeventloop.cpp:204
#9  0x00007feb38a04b10 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#10 0x00007feb38ae39af in QInotifyFileSystemWatcherEngine::run (this=0x1f1af40) at io/qfilesystemwatcher_inotify.cpp:248
#11 0x00007feb38a07aec in QThreadPrivate::start (arg=0x1f1af40) at thread/qthread_unix.cpp:338
#12 0x00007feb35205e9a in start_thread (arg=0x7feb22eec700) at pthread_create.c:308
#13 0x00007feb38142cbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#14 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7feb3aee4780 (LWP 26175)):
[KCrash Handler]
#6  Okular::DocumentPrivate::saveDocumentInfo (this=0x1924300) at ../core/document.cpp:910
#7  0x00007feb29734abd in Okular::Document::closeDocument (this=0x18fdc20) at ../core/document.cpp:1935
#8  0x00007feb299ec9d5 in closeUrl (this=0x18f8ca0, promptToSave=<optimized out>) at ../part.cpp:1412
#9  Okular::Part::closeUrl (this=0x18f8ca0, promptToSave=<optimized out>) at ../part.cpp:1360
#10 0x000000000040a09c in Shell::~Shell (this=0x18bcb60, __in_chrg=<optimized out>, __vtt_parm=<optimized out>) at ../../shell/shell.cpp:128
#11 0x000000000040a149 in Shell::~Shell (this=0x18bcb60, __in_chrg=<optimized out>, __vtt_parm=<optimized out>) at ../../shell/shell.cpp:133
#12 0x00007feb38b19468 in QObject::event (this=0x18bcb60, e=<optimized out>) at kernel/qobject.cpp:1176
#13 0x00007feb395360da in QWidget::event (this=0x18bcb60, event=0x20f4f50) at kernel/qwidget.cpp:8830
#14 0x00007feb398ff1cb in QMainWindow::event (this=0x18bcb60, event=0x20f4f50) at widgets/qmainwindow.cpp:1478
#15 0x00007feb3a2e07d8 in KXmlGuiWindow::event (this=0x18bcb60, ev=0x20f4f50) at ../../kdeui/xmlgui/kxmlguiwindow.cpp:126
#16 0x00007feb394e6e9c in QApplicationPrivate::notify_helper (this=this@entry=0x171bb30, receiver=receiver@entry=0x18bcb60, e=e@entry=0x20f4f50) at kernel/qapplication.cpp:4562
#17 0x00007feb394eb30a in QApplication::notify (this=0x7fffc5a89010, receiver=0x18bcb60, e=0x20f4f50) at kernel/qapplication.cpp:4423
#18 0x00007feb3a1ef1d6 in KApplication::notify (this=0x7fffc5a89010, receiver=0x18bcb60, event=0x20f4f50) at ../../kdeui/kernel/kapplication.cpp:311
#19 0x00007feb38b0456e in QCoreApplication::notifyInternal (this=0x7fffc5a89010, receiver=receiver@entry=0x18bcb60, event=event@entry=0x20f4f50) at kernel/qcoreapplication.cpp:915
#20 0x00007feb38b083f1 in sendEvent (event=0x20f4f50, receiver=0x18bcb60) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#21 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x16f0670) at kernel/qcoreapplication.cpp:1539
#22 0x00007feb38b32a63 in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#23 postEventSourceDispatch (s=0x171f240) at kernel/qeventdispatcher_glib.cpp:279
#24 0x00007feb34d36ab5 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007feb34d36de8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007feb34d36ea4 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007feb38b32bf6 in QEventDispatcherGlib::processEvents (this=0x16f1b30, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#28 0x00007feb3958bc1e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#29 0x00007feb38b032bf in QEventLoop::processEvents (this=this@entry=0x7fffc5a87650, flags=...) at kernel/qeventloop.cpp:149
#30 0x00007feb38b03548 in QEventLoop::exec (this=0x7fffc5a87650, flags=...) at kernel/qeventloop.cpp:204
#31 0x00007feb2548f623 in CHMGenerator::preparePageForSyncOperation (this=this@entry=0x1da5c70, zoom=zoom@entry=100, url=...) at ../../../generators/chm/generator_chm.cpp:195
#32 0x00007feb254906dd in CHMGenerator::loadDocument (this=0x1da5c70, fileName=..., pagesVector=...) at ../../../generators/chm/generator_chm.cpp:152
#33 0x00007feb2972ec27 in Okular::DocumentPrivate::openDocumentInternal (this=0x1924300, offer=..., isstdin=isstdin@entry=false, docFile=..., filedata=...) at ../core/document.cpp:766
#34 0x00007feb29737313 in Okular::Document::openDocument (this=0x18fdc20, docFile=..., url=..., _mime=...) at ../core/document.cpp:1770
#35 0x00007feb299ec096 in Okular::Part::openFile (this=0x18f8ca0) at ../part.cpp:1194
#36 0x00007feb3aacfae0 in KParts::ReadOnlyPartPrivate::openLocalFile (this=this@entry=0x18f80f0) at ../../kparts/part.cpp:590
#37 0x00007feb3aad0074 in KParts::ReadOnlyPart::openUrl (this=0x18f8ca0, url=...) at ../../kparts/part.cpp:554
#38 0x00007feb299df205 in openUrl (_url=..., this=0x18f8ca0) at ../part.cpp:1321
#39 Okular::Part::openUrl (this=0x18f8ca0, _url=...) at ../part.cpp:1292
#40 0x0000000000408cd4 in Shell::openUrl (this=0x18bcb60, url=...) at ../../shell/shell.cpp:141
#41 0x00007feb38b1943e in QObject::event (this=0x18bcb60, e=<optimized out>) at kernel/qobject.cpp:1195
#42 0x00007feb395360da in QWidget::event (this=0x18bcb60, event=0x1cf6c40) at kernel/qwidget.cpp:8830
#43 0x00007feb398ff1cb in QMainWindow::event (this=0x18bcb60, event=0x1cf6c40) at widgets/qmainwindow.cpp:1478
#44 0x00007feb3a2e07d8 in KXmlGuiWindow::event (this=0x18bcb60, ev=0x1cf6c40) at ../../kdeui/xmlgui/kxmlguiwindow.cpp:126
#45 0x00007feb394e6e9c in QApplicationPrivate::notify_helper (this=this@entry=0x171bb30, receiver=receiver@entry=0x18bcb60, e=e@entry=0x1cf6c40) at kernel/qapplication.cpp:4562
#46 0x00007feb394eb30a in QApplication::notify (this=0x7fffc5a89010, receiver=0x18bcb60, e=0x1cf6c40) at kernel/qapplication.cpp:4423
#47 0x00007feb3a1ef1d6 in KApplication::notify (this=0x7fffc5a89010, receiver=0x18bcb60, event=0x1cf6c40) at ../../kdeui/kernel/kapplication.cpp:311
#48 0x00007feb38b0456e in QCoreApplication::notifyInternal (this=0x7fffc5a89010, receiver=receiver@entry=0x18bcb60, event=event@entry=0x1cf6c40) at kernel/qcoreapplication.cpp:915
#49 0x00007feb38b083f1 in sendEvent (event=0x1cf6c40, receiver=0x18bcb60) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#50 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x16f0670) at kernel/qcoreapplication.cpp:1539
#51 0x00007feb38b32a63 in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#52 postEventSourceDispatch (s=0x171f240) at kernel/qeventdispatcher_glib.cpp:279
#53 0x00007feb34d36ab5 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#54 0x00007feb34d36de8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#55 0x00007feb34d36ea4 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#56 0x00007feb38b32bf6 in QEventDispatcherGlib::processEvents (this=0x16f1b30, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#57 0x00007feb3958bc1e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#58 0x00007feb38b032bf in QEventLoop::processEvents (this=this@entry=0x7fffc5a88dc0, flags=...) at kernel/qeventloop.cpp:149
#59 0x00007feb38b03548 in QEventLoop::exec (this=0x7fffc5a88dc0, flags=...) at kernel/qeventloop.cpp:204
#60 0x00007feb38b08708 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1187
#61 0x00000000004079ce in main (argc=<optimized out>, argv=<optimized out>) at ../../shell/main.cpp:85

Reported using DrKonqi