Hi!   KDE Crash Handler had an error when sending the report, so I will copy and paste it's information here.  


///////
Application: digikam (4.2.0)
KDE Platform Version: 4.14.1
Qt Version: 4.8.6
Operating System: Linux 3.16.0-22-generic x86_64
Distribution: Ubuntu Utopic Unicorn (development branch)

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

Digikam consistantly crashes when the "scanning for new files" bar reaches 100%.  I have included a video link to show the behavior.     Please note the bottom right, where you can see the bar climbing towards 100% before crashing.  The video shows 4 crashes.

https://www.youtube.com/watch?v=i3xORCE6ttc&feature=youtu.be

The only customizations I can think of:   Customizing which file types Digikam recognizes.  (Added a svg, svgz, xfc, various video formats, and a few other's which I can not remember.)    In addition, I have ~250,000-400,000+ files in my library.

I believe this behavior also happened with 4.3.0 while I was on 14.04 (4.2.0 worked fine at that point, from my memory.).   I am unable to test 4.4.3 on 14.10 due to not being able to find a working ppa and not exactly being technologically inclined to install otherwise.


Unlikely to be helpful clues:

Also, prior to this behavior, I would experience crashing when accessing certain folders.   (Presumably folders that contained a certain filetype Digikam was K.O.ing itself from.)   And Prior to this, I was experiencing crashing when working with tags (either renaming them, adding, deleting them..  Not sure).   Also, I would notice an odd behavior in renaming a folder causing all of my folders to open which were opened on the last shutdown (I'm guessing). 


Computer Specs:  

OS: Lubuntu 14.10
Processor: I5-3750k.   ...Or whatever the common K series I5 Ivy Bridge number is.
Ram: 16gbs ddr3
HDD: Root has 2GBs of free space, and the Digikam configuration files database and thumbnails database drive has 4.5 GBs of free space.  
Graphics: Intel HD 4000

The crash can be reproduced every time.

-- Backtrace:
Application: digiKam (digikam), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
[Current thread is 1 (Thread 0x7f165b79cac0 (LWP 2683))]

Thread 4 (Thread 0x7f1636e68700 (LWP 3107)):
#0  0x00007f165477f39d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f163c549248 in ?? () from /lib/x86_64-linux-gnu/libusb-1.0.so.0
#2  0x00007f1650bcf0a5 in start_thread (arg=0x7f1636e68700) at pthread_create.c:309
#3  0x00007f165478984d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 3 (Thread 0x7f1630656700 (LWP 3137)):
[KCrash Handler]
#5  0x00007f1651b498f8 in Exiv2::MatroskaVideo::decodeBlock() () from /usr/lib/x86_64-linux-gnu/libexiv2.so.13
#6  0x00007f1651b4a30d in Exiv2::MatroskaVideo::readMetadata() () from /usr/lib/x86_64-linux-gnu/libexiv2.so.13
#7  0x00007f16593ffbcd in KExiv2Iface::KExiv2::load(QString const&) const () from /usr/lib/libkexiv2.so.11
#8  0x00007f1658d02e06 in Digikam::DMetadata::load(QString const&) const () from /usr/lib/digikam/libdigikamcore.so.4.2.0
#9  0x00007f1658747817 in Digikam::ImageScanner::loadFromDisk() () from /usr/lib/digikam/libdigikamdatabase.so.4.2.0
#10 0x00007f1658747a00 in Digikam::ImageScanner::newFile(int) () from /usr/lib/digikam/libdigikamdatabase.so.4.2.0
#11 0x00007f16586d9806 in Digikam::CollectionScanner::scanNewFile(QFileInfo const&, int) () from /usr/lib/digikam/libdigikamdatabase.so.4.2.0
#12 0x00007f16586dcef2 in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.2.0
#13 0x00007f16586dcdac in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.2.0
#14 0x00007f16586dd743 in Digikam::CollectionScanner::scanAlbumRoot(Digikam::CollectionLocation const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.2.0
#15 0x00007f16586def85 in Digikam::CollectionScanner::completeScan() () from /usr/lib/digikam/libdigikamdatabase.so.4.2.0
#16 0x00000000006031a0 in ?? ()
#17 0x00007f165647c39f in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#18 0x00007f1650bcf0a5 in start_thread (arg=0x7f1630656700) at pthread_create.c:309
#19 0x00007f165478984d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7f162fe55700 (LWP 3138)):
#0  0x00007f164d708369 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f164d6c3479 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f164d6c3e0b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f164d6c3ffc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f16565aa04e in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#5  0x00007f165657b4f1 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#6  0x00007f165657b805 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#7  0x00007f1656479c39 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#8  0x00007f165655d033 in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#9  0x00007f165647c39f in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#10 0x00007f1650bcf0a5 in start_thread (arg=0x7f162fe55700) at pthread_create.c:309
#11 0x00007f165478984d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7f165b79cac0 (LWP 2683)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f165647c894 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#2  0x00007f165647bf6e in QThread::wait(unsigned long) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#3  0x000000000060175b in ?? ()
#4  0x0000000000601a27 in ?? ()
#5  0x00007f16546c9599 in __run_exit_handlers (status=1, listp=0x7f1654a4d6c8 <__exit_funcs>, run_list_atexit=run_list_atexit@entry=true) at exit.c:82
#6  0x00007f16546c95e5 in __GI_exit (status=<optimized out>) at exit.c:104
#7  0x00007f16556f4818 in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#8  0x00007f1656fecfd0 in KApplication::xioErrhandler(_XDisplay*) () from /usr/lib/libkdeui.so.5
#9  0x00007f165317888e in _XIOError () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#10 0x00007f16531761fd in _XEventsQueued () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#11 0x00007f1653168190 in XEventsQueued () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#12 0x00007f165572ff5c in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#13 0x00007f164d6c38c1 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#14 0x00007f164d6c3e83 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#15 0x00007f164d6c3ffc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#16 0x00007f16565aa04e in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#17 0x00007f16557304e6 in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#18 0x00007f165657b4f1 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#19 0x00007f165657b805 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#20 0x00000000005feb81 in ?? ()
#21 0x0000000000525f37 in ?? ()
#22 0x00007f1656594f41 in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#23 0x00007f165568d11c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#24 0x00007f1655693870 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#25 0x00007f1656fee57a in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#26 0x00007f165657c86d in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#27 0x00007f165657ff41 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#28 0x00007f16565a9ed3 in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#29 0x00007f164d6c3c5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#30 0x00007f164d6c3f48 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#31 0x00007f164d6c3ffc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#32 0x00007f16565aa031 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#33 0x00007f16557304e6 in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#34 0x00007f165657b4f1 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#35 0x00007f165657b805 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#36 0x00007f1656580f67 in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#37 0x0000000000494246 in ?? ()
#38 0x00007f16546b0ec5 in __libc_start_main (main=0x493100, argc=1, argv=0x7fff40b47d08, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff40b47cf8) at libc-start.c:287
#39 0x000000000049683f in _start ()

Reproducible: Always

Steps to Reproduce:
1. Open Digikam
2. *Kablamoo!!*
3. Cry

Actual Results:  
Digikam will crash when opened

Expected Results:  
Digikam will not crash when opened