.
Thread 3 (Thread 0x7f4b58b72700 (LWP 17913)):
#0  0x00007f4b6458dbf9 in __GI___poll (fds=0x7f4b4c07dcb0, nfds=5, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
        resultvar = 18446744073709551100
        sc_cancel_oldtype = 0
#1  0x00007f4b6192f439 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f4b6192f54c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f4b64ed94df in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f4b64e7e61a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f4b64c9d22a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f4b66598d45 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007f4b64ca216d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f4b63bf26db in start_thread (arg=0x7f4b58b72700) at pthread_create.c:463
        pd = 0x7f4b58b72700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139961587672832, 2696363729823002904, 139961587670784, 0, 139961818987872, 140734233229056, -2594678217661419240, -2594724326580358888}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#9  0x00007f4b6459a88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
.
Thread 2 (Thread 0x7f4b59fd4700 (LWP 17912)):
#0  0x00007f4b6458dbf9 in __GI___poll (fds=0x7f4b59fd3ca8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
        resultvar = 18446744073709551100
        sc_cancel_oldtype = 0
#1  0x00007f4b5ddb0747 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f4b5ddb236a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f4b5cf841c9 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f4b64ca216d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f4b63bf26db in start_thread (arg=0x7f4b59fd4700) at pthread_create.c:463
        pd = 0x7f4b59fd4700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139961609045760, 2696363729823002904, 139961609043712, 0, 94883478232016, 140734233228880, -2594676481420889832, -2594724326580358888}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#6  0x00007f4b6459a88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
.
Thread 1 (Thread 0x7f4b677cb800 (LWP 17881)):
#0  0x00007f4b5322d498 in  () at /usr/lib/x86_64-linux-gnu/libexiv2.so.14
#1  0x00007f4b5361ad67 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kf5/kfilemetadata/kfilemetadata_exiv2extractor.so
#2  0x00007f4b5361b69e in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kf5/kfilemetadata/kfilemetadata_exiv2extractor.so
#3  0x0000564bc656e54b in  ()
#4  0x0000564bc656e950 in  ()
#5  0x00007f4b64ebbcc4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f4b64eafccb in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f4b65bfe82c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#8  0x00007f4b65c060f4 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#9  0x00007f4b64e805c8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f4b64ed897e in QTimerInfoList::activateTimers() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f4b64ed9179 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007f4b6192f287 in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#13 0x00007f4b6192f4c0 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#14 0x00007f4b6192f54c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#15 0x00007f4b64ed94df in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#16 0x00007f4b64e7e61a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007f4b64e87664 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x0000564bc656d96f in  ()
#19 0x00007f4b6449ab97 in __libc_start_main (main=0x564bc656d730, argc=1, argv=0x7fff3dfabe98, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff3dfabe88) at ../csu/libc-start.c:310
        result = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, -8503671129637326568, 94883450116640, 140734233230992, 0, 0, -2696227413933100776, -2594741794285096680}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x7f4b6760e733 <_dl_init+259>, 0x7f4b675fc838}, data = {prev = 0x0, cleanup = 0x0, canceltype = 1734403891}}}
        not_first_call = <optimized out>
#20 0x0000564bc656da4a in _start ()