Application: digikam (4.12.0)
KDE Platform Version: 4.14.16
Qt Version: 4.8.7
Operating System: Linux 4.4.0-36-generic i686
Distribution: Linux Mint 18 Sarah

-- Information about the crash:
- What I was doing when the application crashed: clicked 
"ok" in digikam image editor after choosing B&W effect

The crash can be reproduced every time.

-- Backtrace:
Application: digiKam (digikam), signal: Segmentation fault
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0xacbfa9c0 (LWP 19436))]

Thread 5 (Thread 0x9c6fab40 (LWP 20910)):
[KCrash Handler]
#7  __memcpy_ssse3 () at ../sysdeps/i386/i686/multiarch/memcpy-ssse3.S:144
#8  0xb6d4fa68 in Digikam::DImg::putImageData(unsigned char*, bool) () from /usr/lib/digikam/libdigikamcore.so.4.12.0
#9  0xb6e04c5a in Digikam::MixerFilter::filterImage() () from /usr/lib/digikam/libdigikamcore.so.4.12.0
#10 0xb6da15b9 in Digikam::DImgThreadedFilter::startFilterDirectly() () from /usr/lib/digikam/libdigikamcore.so.4.12.0
#11 0xb6dfb0dc in Digikam::BWSepiaFilter::applyChannelMixer(Digikam::DImg&) () from /usr/lib/digikam/libdigikamcore.so.4.12.0
#12 0xb6dfb43d in Digikam::BWSepiaFilter::blackAndWhiteConversion(Digikam::DImg&, int) () from /usr/lib/digikam/libdigikamcore.so.4.12.0
#13 0xb6dfba64 in Digikam::BWSepiaFilter::filterImage() () from /usr/lib/digikam/libdigikamcore.so.4.12.0
#14 0xb6da15b9 in Digikam::DImgThreadedFilter::startFilterDirectly() () from /usr/lib/digikam/libdigikamcore.so.4.12.0
#15 0xb6da042d in Digikam::DImgThreadedFilter::run() () from /usr/lib/digikam/libdigikamcore.so.4.12.0
#16 0xb6f82723 in Digikam::DynamicThread::DynamicThreadPriv::run() () from /usr/lib/digikam/libdigikamcore.so.4.12.0
#17 0xb456c3c9 in ?? () from /usr/lib/i386-linux-gnu/libQtCore.so.4
#18 0xb4579d3e in ?? () from /usr/lib/i386-linux-gnu/libQtCore.so.4
#19 0xb392e2b5 in start_thread (arg=0x9c6fab40) at pthread_create.c:333
#20 0xb422816e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:114

Thread 4 (Thread 0xaa7ffb40 (LWP 19439)):
#0  0xb30855cf in g_main_context_prepare () from /lib/i386-linux-gnu/libglib-2.0.so.0
#1  0xb3086014 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#2  0xb3086244 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0xb46ca11c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/i386-linux-gnu/libQtCore.so.4
#4  0xb4695c5d in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/i386-linux-gnu/libQtCore.so.4
#5  0xb4695fee in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/i386-linux-gnu/libQtCore.so.4
#6  0xb45770eb in QThread::exec() () from /usr/lib/i386-linux-gnu/libQtCore.so.4
#7  0xb46754a6 in ?? () from /usr/lib/i386-linux-gnu/libQtCore.so.4
#8  0xb4579d3e in ?? () from /usr/lib/i386-linux-gnu/libQtCore.so.4
#9  0xb392e2b5 in start_thread (arg=0xaa7ffb40) at pthread_create.c:333
#10 0xb422816e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:114

Thread 3 (Thread 0xab135b40 (LWP 19438)):
#0  0xb7708c31 in __kernel_vsyscall ()
#1  0xb3933a8c in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/i386/pthread_cond_wait.S:187
#2  0xb42348cd in __pthread_cond_wait (cond=0x97eec90, mutex=0x97eec78) at forward.c:149
#3  0xb457a312 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/i386-linux-gnu/libQtCore.so.4
#4  0x082256be in ?? ()
#5  0xb4579d3e in ?? () from /usr/lib/i386-linux-gnu/libQtCore.so.4
#6  0xb392e2b5 in start_thread (arg=0xab135b40) at pthread_create.c:333
#7  0xb422816e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:114

Thread 2 (Thread 0xac9f7b40 (LWP 19437)):
#0  0xb7708c31 in __kernel_vsyscall ()
#1  0xb421df8f in poll () at ../sysdeps/unix/syscall-template.S:84
#2  0xafb417cb in ?? () from /lib/i386-linux-gnu/libusb-1.0.so.0
#3  0xb392e2b5 in start_thread (arg=0xac9f7b40) at pthread_create.c:333
#4  0xb422816e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:114

Thread 1 (Thread 0xacbfa9c0 (LWP 19436)):
#0  0xb7708c31 in __kernel_vsyscall ()
#1  0xb3933a8c in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/i386/pthread_cond_wait.S:187
#2  0xb42348cd in __pthread_cond_wait (cond=0x9a20970, mutex=0x9a20958) at forward.c:149
#3  0xb457a312 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/i386-linux-gnu/libQtCore.so.4
#4  0xb456b72e in ?? () from /usr/lib/i386-linux-gnu/libQtCore.so.4
#5  0xb456cbfc in QThreadPool::~QThreadPool() () from /usr/lib/i386-linux-gnu/libQtCore.so.4
#6  0xb456cc4a in QThreadPool::~QThreadPool() () from /usr/lib/i386-linux-gnu/libQtCore.so.4
#7  0xb46b1227 in QObjectPrivate::deleteChildren() () from /usr/lib/i386-linux-gnu/libQtCore.so.4
#8  0xb46b3a27 in QObject::~QObject() () from /usr/lib/i386-linux-gnu/libQtCore.so.4
#9  0xb6f7deef in Digikam::ThreadManager::~ThreadManager() () from /usr/lib/digikam/libdigikamcore.so.4.12.0
#10 0xb6f7df64 in ?? () from /usr/lib/digikam/libdigikamcore.so.4.12.0
#11 0xb6d5de59 in ?? () from /usr/lib/digikam/libdigikamcore.so.4.12.0
#12 0xb416f973 in __run_exit_handlers (status=1, listp=0xb42f33dc <__exit_funcs>, run_list_atexit=true) at exit.c:82
#13 0xb416f9cf in __GI_exit (status=1) at exit.c:104
#14 0xb1b4c537 in ?? () from /usr/lib/i386-linux-gnu/libgdk-x11-2.0.so.0
#15 0xb58a6f19 in KApplication::xioErrhandler(_XDisplay*) () from /usr/lib/libkdeui.so.5
#16 0xb58a6ff1 in ?? () from /usr/lib/libkdeui.so.5
#17 0xb38162ed in _XIOError () from /usr/lib/i386-linux-gnu/libX11.so.6
#18 0xb3813b56 in _XEventsQueued () from /usr/lib/i386-linux-gnu/libX11.so.6
#19 0xb3804fac in XEventsQueued () from /usr/lib/i386-linux-gnu/libX11.so.6
#20 0xb4da54e1 in ?? () from /usr/lib/i386-linux-gnu/libQtGui.so.4
#21 0xb3085aca in g_main_context_check () from /lib/i386-linux-gnu/libglib-2.0.so.0
#22 0xb30860a1 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#23 0xb3086244 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#24 0xb46ca0f5 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/i386-linux-gnu/libQtCore.so.4
#25 0xb4da5b66 in ?? () from /usr/lib/i386-linux-gnu/libQtGui.so.4
#26 0xb4695c5d in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/i386-linux-gnu/libQtCore.so.4
#27 0xb4695fee in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/i386-linux-gnu/libQtCore.so.4
#28 0xb469c5f6 in QCoreApplication::exec() () from /usr/lib/i386-linux-gnu/libQtCore.so.4
#29 0xb4ce64e4 in QApplication::exec() () from /usr/lib/i386-linux-gnu/libQtGui.so.4
#30 0x080bc135 in ?? ()
#31 0xb4159637 in __libc_start_main (main=0x80badb0, argc=1, argv=0xbfedf844, init=0x84e4ec0 <__libc_csu_init>, fini=0x84e4f20 <__libc_csu_fini>, rtld_fini=0xb7718780 <_dl_fini>, stack_end=0xbfedf83c) at ../csu/libc-start.c:291
#32 0x080bf294 in _start ()

Reported using DrKonqi