Hello,

I was using digikam for years and I appreciate a lot this wonderfull software.
Unfortunatly, my photo collection has grown in the last years, and now Digikam is unusable... take hours to launch trying to scan the collection and finaly crashes.

I have about 220000 files in my photo collection, for a total of 485GB. These files are stored on a local hard disk (SATA 7200RPM), and I have a descent computer ( Intel i7 3.2GHz, 8GB RAM, running Cubuntu 14.10), and digikam is using a MySql database located on a different server, over a gigabit network.

I am using digikam 4.4.0 (kde platform 4.14.1) on Cubuntu 14.10 running cinnamon desktop.

In this version of Digikam, there is no option anymore to avoid initial scanning, because Digikam is doing the scanning in background. But the launch stil take between 15 to 30mn...
And then, it start scanning files in background, which takes forever, and generaly end up crashing.
By the time being, I can not seen the thumbnails in the folders... so I can not use digikam anymore.

What can I do to be able to use digikam again on my large photo collection ?

Will it be possible to improve digikam to allow it to manage hudge photo collections. Here what I would suggest:
- Allow to disable automatic scanning
- be able to launch scanning durng the night
- when user click on a folder, digikam only scan this folder in realtime, if the data are not already present in the database, making digikam usable even if the initial scanning has not been fully performed

What do you think ?

Any help will be greatly appreciated !
Thanks in advance.
Bernard

As I said... Digikam ends up crashing. Here is the crash report:

Code: Select all

Application: digiKam (digikam), signal: Aborted
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 0x7f1e2fea6ac0 (LWP 5325))]

Thread 4 (Thread 0x7f1e06f20700 (LWP 5329)):
#0  0x00007f1e288cb39d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f1e0c488248 in ?? () from /lib/x86_64-linux-gnu/libusb-1.0.so.0
#2  0x00007f1e24b030a5 in start_thread (arg=0x7f1e06f20700) at pthread_create.c:309
#3  0x00007f1e288d584d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 3 (Thread 0x7f1df912b700 (LWP 5330)):
[KCrash Handler]
#6  0x00007f1e28811d27 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#7  0x00007f1e28813418 in __GI_abort () at abort.c:89
#8  0x00007f1e288539f4 in __libc_message (do_abort=do_abort@entry=1, fmt=fmt@entry=0x7f1e2895ca40 "*** Error in `%s': %s: 0x%s ***\n") at ../sysdeps/posix/libc_fatal.c:175
#9  0x00007f1e2885b006 in malloc_printerr (ptr=<optimized out>, str=0x7f1e2895cbe0 "free(): invalid next size (fast)", action=1) at malloc.c:4996
#10 _int_free (av=<optimized out>, p=<optimized out>, have_lock=0) at malloc.c:3840
#11 0x00007f1e25cd69f7 in Exiv2::RiffVideo::infoTagsHandler() () from /usr/lib/x86_64-linux-gnu/libexiv2.so.13
#12 0x00007f1e25cdb885 in Exiv2::RiffVideo::decodeBlock() () from /usr/lib/x86_64-linux-gnu/libexiv2.so.13
#13 0x00007f1e25cdb4d8 in Exiv2::RiffVideo::tagDecoder(Exiv2::DataBuf&, unsigned long) () from /usr/lib/x86_64-linux-gnu/libexiv2.so.13
#14 0x00007f1e25cdb885 in Exiv2::RiffVideo::decodeBlock() () from /usr/lib/x86_64-linux-gnu/libexiv2.so.13
#15 0x00007f1e25cdbbf8 in Exiv2::RiffVideo::readMetadata() () from /usr/lib/x86_64-linux-gnu/libexiv2.so.13
#16 0x00007f1e2db12c1d in KExiv2Iface::KExiv2::load(QString const&) const () from /usr/lib/libkexiv2.so.11
#17 0x00007f1e2d3f8c36 in Digikam::DMetadata::load(QString const&) const () from /usr/lib/digikam/libdigikamcore.so.4.4.0
#18 0x00007f1e2ce261c7 in Digikam::ImageScanner::loadFromDisk() () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#19 0x00007f1e2ce26450 in Digikam::ImageScanner::newFile(int) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#20 0x00007f1e2cdb7de6 in Digikam::CollectionScanner::scanNewFile(QFileInfo const&, int) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#21 0x00007f1e2cdbb852 in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#22 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#23 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#24 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#25 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#26 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#27 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#28 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#29 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#30 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#31 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#32 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#33 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#34 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#35 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#36 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#37 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#38 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#39 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#40 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#41 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#42 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#43 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#44 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#45 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#46 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#47 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#48 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#49 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#50 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#51 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#52 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#53 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#54 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#55 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#56 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#57 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#58 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#59 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#60 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#61 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#62 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#63 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#64 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#65 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#66 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#67 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#68 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#69 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#70 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#71 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#72 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#73 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#74 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#75 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#76 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#77 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#78 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#79 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#80 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#81 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#82 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#83 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#84 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#85 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#86 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#87 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#88 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#89 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#90 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#91 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#92 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#93 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#94 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#95 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#96 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#97 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#98 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#99 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#100 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#101 0x00007f1e2cdbb70f in Digikam::CollectionScanner::scanAlbum(Digikam::CollectionLocation const&, QString const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#102 0x00007f1e2cdbc0a3 in Digikam::CollectionScanner::scanAlbumRoot(Digikam::CollectionLocation const&) () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#103 0x00007f1e2cdbdc8d in Digikam::CollectionScanner::completeScan() () from /usr/lib/digikam/libdigikamdatabase.so.4.4.0
#104 0x000000000060a6d0 in ?? ()
#105 0x00007f1e296c339f in QThreadPrivate::start (arg=0x2d9d580) at thread/qthread_unix.cpp:349
#106 0x00007f1e24b030a5 in start_thread (arg=0x7f1df912b700) at pthread_create.c:309
#107 0x00007f1e288d584d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7f1df892a700 (LWP 5331)):
#0  0x00007f1e288cb39d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f1e208a1ee4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f1e208a1ffc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f1e297f104e in QEventDispatcherGlib::processEvents (this=0x7f1dec0008e0, flags=...) at kernel/qeventdispatcher_glib.cpp:436
#4  0x00007f1e297c24f1 in QEventLoop::processEvents (this=this@entry=0x7f1df8929ae0, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f1e297c2805 in QEventLoop::exec (this=this@entry=0x7f1df8929ae0, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007f1e296c0c39 in QThread::exec (this=this@entry=0x2d9ff80) at thread/qthread.cpp:538
#7  0x00007f1e297a4033 in QInotifyFileSystemWatcherEngine::run (this=0x2d9ff80) at io/qfilesystemwatcher_inotify.cpp:265
#8  0x00007f1e296c339f in QThreadPrivate::start (arg=0x2d9ff80) at thread/qthread_unix.cpp:349
#9  0x00007f1e24b030a5 in start_thread (arg=0x7f1df892a700) at pthread_create.c:309
#10 0x00007f1e288d584d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7f1e2fea6ac0 (LWP 5325)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f1e296c3894 in wait (time=18446744073709551615, this=0x2d9d6b0) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=this@entry=0x2d9d660, mutex=mutex@entry=0x2d9d638, time=time@entry=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x00007f1e296c2f6e in QThread::wait (this=<optimized out>, time=18446744073709551615) at thread/qthread_unix.cpp:720
#4  0x00000000006099ab in ?? ()
#5  0x0000000000609b47 in ?? ()
#6  0x00007f1e28815599 in __run_exit_handlers (status=1, listp=0x7f1e28b996c8 <__exit_funcs>, run_list_atexit=run_list_atexit@entry=true) at exit.c:82
#7  0x00007f1e288155e5 in __GI_exit (status=<optimized out>) at exit.c:104
#8  0x00007f1e1418baa4 in ?? () from /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
#9  0x00007f1e2aef3fd0 in KApplication::xioErrhandler (this=0x7fff26db0630, dpy=0x29af840) at ../../kdeui/kernel/kapplication.cpp:419
#10 0x00007f1e272c488e in _XIOError () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#11 0x00007f1e272c21fd in _XEventsQueued () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#12 0x00007f1e272b4190 in XEventsQueued () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#13 0x00007f1e2a26ff5c in x11EventSourceCheck (s=0x2979530) at kernel/qguieventdispatcher_glib.cpp:85
#14 0x00007f1e208a18c1 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#15 0x00007f1e208a1e83 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#16 0x00007f1e208a1ffc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#17 0x00007f1e297f1031 in QEventDispatcherGlib::processEvents (this=0x287e5c0, flags=...) at kernel/qeventdispatcher_glib.cpp:434
#18 0x00007f1e2a2704e6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#19 0x00007f1e297c24f1 in QEventLoop::processEvents (this=this@entry=0x2d924a0, flags=...) at kernel/qeventloop.cpp:149
#20 0x00007f1e297c2805 in QEventLoop::exec (this=0x2d924a0, flags=...) at kernel/qeventloop.cpp:204
#21 0x0000000000606591 in ?? ()
#22 0x000000000052a487 in ?? ()
#23 0x00007f1e297dbf41 in QObject::event (this=0x79719c0, e=<optimized out>) at kernel/qobject.cpp:1222
#24 0x00007f1e2a1cd11c in QApplicationPrivate::notify_helper (this=this@entry=0x297a190, receiver=receiver@entry=0x79719c0, e=e@entry=0x2d9e1e0) at kernel/qapplication.cpp:4570
#25 0x00007f1e2a1d3870 in QApplication::notify (this=this@entry=0x7fff26db0630, receiver=receiver@entry=0x79719c0, e=e@entry=0x2d9e1e0) at kernel/qapplication.cpp:4356
#26 0x00007f1e2aef557a in KApplication::notify (this=0x7fff26db0630, receiver=0x79719c0, event=0x2d9e1e0) at ../../kdeui/kernel/kapplication.cpp:311
#27 0x00007f1e297c386d in QCoreApplication::notifyInternal (this=0x7fff26db0630, receiver=receiver@entry=0x79719c0, event=event@entry=0x2d9e1e0) at kernel/qcoreapplication.cpp:953
#28 0x00007f1e297c6f41 in sendEvent (event=0x2d9e1e0, receiver=0x79719c0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#29 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x287ccc0) at kernel/qcoreapplication.cpp:1577
#30 0x00007f1e297c73d3 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1470
#31 0x00007f1e297f0ed3 in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#32 postEventSourceDispatch (s=0x297b180) at kernel/qeventdispatcher_glib.cpp:287
#33 0x00007f1e208a1c5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#34 0x00007f1e208a1f48 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#35 0x00007f1e208a1ffc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#36 0x00007f1e297f1031 in QEventDispatcherGlib::processEvents (this=0x287e5c0, flags=...) at kernel/qeventdispatcher_glib.cpp:434
#37 0x00007f1e2a2704e6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#38 0x00007f1e297c24f1 in QEventLoop::processEvents (this=this@entry=0x7fff26db0140, flags=...) at kernel/qeventloop.cpp:149
#39 0x00007f1e297c2805 in QEventLoop::exec (this=this@entry=0x7fff26db0140, flags=...) at kernel/qeventloop.cpp:204
#40 0x00007f1e297c7f67 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1225
#41 0x0000000000495f76 in ?? ()
#42 0x00007f1e287fcec5 in __libc_start_main (main=0x494e30, argc=5, argv=0x7fff26db0838, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff26db0828) at libc-start.c:287
#43 0x000000000049856f in _start ()



Any idea ?
Thanks in advance.

for an outlier case like this I'd suggest the mailing list or irc