When I start digikam it usually starts searching for new entries. Some day it started but stopped after a short time of searching. It just stops after e.g. 13% of searching and crashes. Chrashes means, it is still there but no longer usable. 

What I did so far:
System update
digikam reinstall
searched the web --> nothing
used gdb (see below)


Reproducible: Always

Steps to Reproduce:
I simply reproduce ist like this:
1. I put all new pictures (CR2) in specific subdirectories on an external HDD
2. start digikam
3. digikam starts searching for new entries
4. after a while ist just stops. With existing database after 91%. With new database after 13%. So actually on different places in the db and different pictures.

Actual Results:  
digikam just stops and hangs somehow. If I stop the process i am not able to access any album and I do not see any thumbnails.

Expected Results:  
Import all pictures into the db.

Some infos about the system:
Linux biohazard 4.0.5-gentoo-mykernel-nvidia #2 SMP Fri Jul 31 23:25:53 CEST 2015 x86_64 Intel(R) Pentium(R) 4 CPU 3.20GHz GenuineIntel GNU/Linux
Digikam installed versions:  4.4.0-r1(4)^t(21:37:31 27.07.2015)(debug gphoto2 mysql semantic-desktop thumbnails video
gcc Installed versions:  4.8.4(4.8)^s(02:34:06 15.06.2015)(cxx fortran multilib nls nptl openmp sanitize

Here are the last lines of the debugger:


digikam(3010)/digikam (core) Digikam::ImageScanner::prepareAddImage: Adding new item 
"/run/media/andy/BILDER_03/2003/2003_10_25_Australien/Panorama/2003_101_1535_1539_panorama.jpg"
digikam(3010)/digikam (core) Digikam::ImageScanner::scanTags: Pick Label found :  0
digikam(3010)/digikam (core) Digikam::ImageScanner::scanTags: Assigned Pick Label Tag  :  20
digikam(3010)/digikam (core) Digikam::ImageScanner::scanTags: Color Label found :  0
digikam(3010)/digikam (core) Digikam::ImageScanner::scanTags: Assigned Color Label Tag  :  10
digikam(3010)/digikam (core) Digikam::DMetadata::getImageHistory: Loading image history  ""
digikam(3010)/digikam (core) Digikam::ImageScanner::commit: Scanning took 123 ms
digikam(3010)/digikam (core) Digikam::ImageScanner::~ImageScanner: Finishing took 1 ms
digikam(3010)/digikam (core) Digikam::DImg::load: "/run/media/andy/BILDER_03/2003/2003_10_25_Australien/Panorama/2003_101_1535_1539_panorama.tif"  : 
TIFF file identified
digikam(3010)/digikam (core) Digikam::ImageScanner::prepareAddImage: Adding new item 
"/run/media/andy/BILDER_03/2003/2003_10_25_Australien/Panorama/2003_101_1535_1539_panorama.tif"
digikam(3010)/digikam (core) Digikam::ImageScanner::scanTags: Pick Label found :  0
digikam(3010)/digikam (core) Digikam::ImageScanner::scanTags: Assigned Pick Label Tag  :  20
digikam(3010)/digikam (core) Digikam::ImageScanner::scanTags: Color Label found :  0
digikam(3010)/digikam (core) Digikam::ImageScanner::scanTags: Assigned Color Label Tag  :  10
digikam(3010)/digikam (core) Digikam::DMetadata::getImageHistory: Loading image history  ""
digikam(3010)/digikam (core) Digikam::ImageScanner::commit: Scanning took 93 ms
digikam(3010)/digikam (core) Digikam::ImageScanner::~ImageScanner: Finishing took 1 ms
[Switching to Thread 0x7fffd70b4700 (LWP 3014)]
Catchpoint 1 (exception thrown), 0x00007ffff19b719f in __cxa_throw () from /usr/lib/gcc/x86_64-pc-linux-gnu/4.8.4/libstdc++.so.6


This is the backtrace:

(gdb) bt
#0  0x00007ffff19b719f in __cxa_throw () from /usr/lib/gcc/x86_64-pc-linux-gnu/4.8.4/libstdc++.so.6
#1  0x00007ffff0032f45 in Exiv2::JpegBase::readMetadata() () from /usr/lib64/libexiv2.so.13
#2  0x00007ffff6fbbfaa in KExiv2Iface::KExiv2::load(QString const&) const () from /usr/lib64/libkexiv2.so.11
#3  0x00007ffff605066a in Digikam::DMetadata::load(QString const&) const () from /usr/lib64/libdigikamcore.so.4.4.0
#4  0x00007ffff65fb020 in Digikam::ImageScanner::loadFromDisk() () from /usr/lib64/libdigikamdatabase.so.4.4.0
#5  0x00007ffff65fb1d0 in Digikam::ImageScanner::newFile(int) () from /usr/lib64/libdigikamdatabase.so.4.4.0
#6  0x00007ffff6593a6e in Digikam::CollectionScanner::scanNewFile(QFileInfo const&, int) () from /usr/lib64/libdigikamdatabase.so.4.4.0
#7  0x00007ffff6596f54 in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) ()
   from /usr/lib64/libdigikamdatabase.so.4.4.0
#8  0x00007ffff6596e82 in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) ()
   from /usr/lib64/libdigikamdatabase.so.4.4.0
#9  0x00007ffff6596e82 in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) ()
   from /usr/lib64/libdigikamdatabase.so.4.4.0
#10 0x00007ffff6596e82 in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) ()
   from /usr/lib64/libdigikamdatabase.so.4.4.0
#11 0x00007ffff659762d in Digikam::CollectionScanner::scanAlbumRoot(Digikam::CollectionLocation const&) () from 
/usr/lib64/libdigikamdatabase.so.4.4.0
#12 0x00007ffff659894e in Digikam::CollectionScanner::completeScan() () from /usr/lib64/libdigikamdatabase.so.4.4.0
#13 0x00000000005f5566 in ?? ()
#14 0x00007ffff1f45acd in ?? () from /usr/lib64/qt4/libQtCore.so.4
#15 0x00007fffef676102 in start_thread () from /lib64/libpthread.so.0
#16 0x00007ffff11981cd in clone () from /lib64/libc.so.6
(gdb)