Application: scangui (4.12.0)
KDE Platform Version: 4.14.16
Qt Version: 4.8.7
Operating System: Linux 4.4.0-109-generic x86_64
Distribution: Ubuntu 16.04.3 LTS

-- Information about the crash:
- What I was doing when the application crashed: nothing particular. Scan was performed directly after booting system with usual set of programs opened with which scanning worked earlier (Chromium Browser, Evoltion Email, Clementine, Konsole).

-- Backtrace:
Application: Skanowanie Obrazów (scangui), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fd8c83c2980 (LWP 5804))]

Thread 6 (Thread 0x7fd8b4d45700 (LWP 7576)):
[KCrash Handler]
#6  0x00007fd8c7964527 in KIPIPlugins::KPWriteImage::write2PNG (this=this@entry=0x7fd8b4d44bb0, destPath=...) at /build/digikam-J9prv3/digikam-4.12.0/extra/kipi-plugins/common/libkipiplugins/tools/imageio/kpwriteimage.cpp:498
#7  0x0000000000409578 in KIPIAcquireImagesPlugin::SaveImgThread::run (this=0x1a5e8a0) at /build/digikam-J9prv3/digikam-4.12.0/extra/kipi-plugins/acquireimages/saveimgthread.cpp:170
#8  0x00007fd8c5791e3c in QThreadPrivate::start (arg=0x1a5e8a0) at thread/qthread_unix.cpp:352
#9  0x00007fd8c0e076ba in start_thread (arg=0x7fd8b4d45700) at pthread_create.c:333
#10 0x00007fd8c50d23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7fd89b362700 (LWP 6360)):
#0  0x00007fd8c50c670d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fd8c04d838c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd8c04d849c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd8c58d22ce in QEventDispatcherGlib::processEvents (this=0x7fd8b00c2110, flags=...) at kernel/qeventdispatcher_glib.cpp:452
#4  0x00007fd8c58a018f in QEventLoop::processEvents (this=this@entry=0x7fd89b361c00, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fd8c58a04f5 in QEventLoop::exec (this=this@entry=0x7fd89b361c00, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007fd8c578f549 in QThread::exec (this=this@entry=0x1c39ec0) at thread/qthread.cpp:538
#7  0x00007fd8c5880223 in QInotifyFileSystemWatcherEngine::run (this=0x1c39ec0) at io/qfilesystemwatcher_inotify.cpp:265
#8  0x00007fd8c5791e3c in QThreadPrivate::start (arg=0x1c39ec0) at thread/qthread_unix.cpp:352
#9  0x00007fd8c0e076ba in start_thread (arg=0x7fd89b362700) at pthread_create.c:333
#10 0x00007fd8c50d23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7fd89bb63700 (LWP 5809)):
#0  0x00007fd8c50c670d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fd8aeb3494a in ?? () from /usr/lib/x86_64-linux-gnu/libavahi-common.so.3
#2  0x00007fd8aeb344d3 in avahi_simple_poll_run () from /usr/lib/x86_64-linux-gnu/libavahi-common.so.3
#3  0x00007fd8aeb346a8 in avahi_simple_poll_iterate () from /usr/lib/x86_64-linux-gnu/libavahi-common.so.3
#4  0x00007fd8aeb348dd in avahi_simple_poll_loop () from /usr/lib/x86_64-linux-gnu/libavahi-common.so.3
#5  0x00007fd8aeb349a4 in ?? () from /usr/lib/x86_64-linux-gnu/libavahi-common.so.3
#6  0x00007fd8c0e076ba in start_thread (arg=0x7fd89bb63700) at pthread_create.c:333
#7  0x00007fd8c50d23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7fd8a975d700 (LWP 5808)):
#0  0x00007fd8c50c670d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fd8af59f64c in ?? () from /lib/x86_64-linux-gnu/libusb-1.0.so.0
#2  0x00007fd8c0e076ba in start_thread (arg=0x7fd8a975d700) at pthread_create.c:333
#3  0x00007fd8c50d23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7fd8ac5ca700 (LWP 5807)):
#0  0x00007fd8c50c670d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fd8c04d838c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd8c04d849c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd8c58d22ce in QEventDispatcherGlib::processEvents (this=0x7fd8a40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:452
#4  0x00007fd8c58a018f in QEventLoop::processEvents (this=this@entry=0x7fd8ac5c9c00, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fd8c58a04f5 in QEventLoop::exec (this=this@entry=0x7fd8ac5c9c00, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007fd8c578f549 in QThread::exec (this=this@entry=0x1704c50) at thread/qthread.cpp:538
#7  0x00007fd8c5880223 in QInotifyFileSystemWatcherEngine::run (this=0x1704c50) at io/qfilesystemwatcher_inotify.cpp:265
#8  0x00007fd8c5791e3c in QThreadPrivate::start (arg=0x1704c50) at thread/qthread_unix.cpp:352
#9  0x00007fd8c0e076ba in start_thread (arg=0x7fd8ac5ca700) at pthread_create.c:333
#10 0x00007fd8c50d23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7fd8c83c2980 (LWP 5804)):
#0  0x00007fd8c50c224d in read () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fd8c051b6f0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd8c04d7e74 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd8c04d8330 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fd8c04d849c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fd8c58d22ae in QEventDispatcherGlib::processEvents (this=0x158a1a0, flags=...) at kernel/qeventdispatcher_glib.cpp:450
#6  0x00007fd8c5e7c616 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#7  0x00007fd8c58a018f in QEventLoop::processEvents (this=this@entry=0x7fffe6d1dac0, flags=...) at kernel/qeventloop.cpp:149
#8  0x00007fd8c58a04f5 in QEventLoop::exec (this=this@entry=0x7fffe6d1dac0, flags=...) at kernel/qeventloop.cpp:204
#9  0x00007fd8c58a64b9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1227
#10 0x00007fd8c5dcd22c in QApplication::exec () at kernel/qapplication.cpp:3828
#11 0x00000000004062bd in main (argc=<optimized out>, argv=<optimized out>) at /build/digikam-J9prv3/digikam-4.12.0/extra/kipi-plugins/acquireimages/scangui.cpp:82

Reported using DrKonqi