Application: digikam (3.5.0)
KDE Platform Version: 4.13.0
Qt Version: 4.8.6
Operating System: Linux 3.13.0-24-generic x86_64
Distribution: Ubuntu 14.04 LTS

-- Information about the crash:
I clicked on "search for duplicates".
It was the first time I used the program, I had just scanned my recently added pictures for similar pictures.

-- Backtrace:
Application: digiKam (digikam), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fc23c641ac0 (LWP 7046))]

Thread 8 (Thread 0x7fc217d04700 (LWP 7047)):
#0  0x00007fc236054fbd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fc21c8af248 in ?? () from /lib/x86_64-linux-gnu/libusb-1.0.so.0
#2  0x00007fc2312e4182 in start_thread (arg=0x7fc217d04700) at pthread_create.c:312
#3  0x00007fc23606230d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 7 (Thread 0x7fc210bcc700 (LWP 7049)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fc236e43816 in wait (time=18446744073709551615, this=0x15ba890) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=this@entry=0x15b7420, mutex=mutex@entry=0x15b7418, time=time@entry=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x00000000005d5ede in Digikam::ScanController::run (this=0x11b6150) at /build/buildd/digikam-3.5.0/core/digikam/database/scancontroller.cpp:725
#4  0x00007fc236e4332f in QThreadPrivate::start (arg=0x11b6150) at thread/qthread_unix.cpp:349
#5  0x00007fc2312e4182 in start_thread (arg=0x7fc210bcc700) at pthread_create.c:312
#6  0x00007fc23606230d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 6 (Thread 0x7fc20bfff700 (LWP 7050)):
#0  0x00007fc2312e77ee in __pthread_mutex_unlock_usercnt (decr=1, mutex=0x7fc204000a60) at pthread_mutex_unlock.c:57
#1  __GI___pthread_mutex_unlock (mutex=0x7fc204000a60) at pthread_mutex_unlock.c:310
#2  0x00007fc22eb4d9c1 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc22eb0b8f9 in g_main_context_query () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fc22eb0bf52 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fc22eb0c0ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007fc236f727be in QEventDispatcherGlib::processEvents (this=0x7fc2040008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:436
#7  0x00007fc236f440af in QEventLoop::processEvents (this=this@entry=0x7fc20bffeae0, flags=...) at kernel/qeventloop.cpp:149
#8  0x00007fc236f443a5 in QEventLoop::exec (this=this@entry=0x7fc20bffeae0, flags=...) at kernel/qeventloop.cpp:204
#9  0x00007fc236e40c5f in QThread::exec (this=this@entry=0x1468160) at thread/qthread.cpp:537
#10 0x00007fc236f25823 in QInotifyFileSystemWatcherEngine::run (this=0x1468160) at io/qfilesystemwatcher_inotify.cpp:265
#11 0x00007fc236e4332f in QThreadPrivate::start (arg=0x1468160) at thread/qthread_unix.cpp:349
#12 0x00007fc2312e4182 in start_thread (arg=0x7fc20bfff700) at pthread_create.c:312
#13 0x00007fc23606230d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 5 (Thread 0x7fc20b7fe700 (LWP 7056)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fc236e43816 in wait (time=18446744073709551615, this=0x1482bf0) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=this@entry=0x114bab0, mutex=mutex@entry=0x114baa8, time=time@entry=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x00007fc239cbc79a in Digikam::ParkingThread::run (this=0x114ba90) at /build/buildd/digikam-3.5.0/core/libs/threads/threadmanager.cpp:119
#4  0x00007fc236e4332f in QThreadPrivate::start (arg=0x114ba90) at thread/qthread_unix.cpp:349
#5  0x00007fc2312e4182 in start_thread (arg=0x7fc20b7fe700) at pthread_create.c:312
#6  0x00007fc23606230d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 4 (Thread 0x7fc20a985700 (LWP 7060)):
#0  0x00007fc2360536bd in read () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fc22eb4cc20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc22eb0bb14 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc22eb0bf7b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fc22eb0c0ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fc236f727be in QEventDispatcherGlib::processEvents (this=0x7fc2000008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:436
#6  0x00007fc236f440af in QEventLoop::processEvents (this=this@entry=0x7fc20a984ae0, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007fc236f443a5 in QEventLoop::exec (this=this@entry=0x7fc20a984ae0, flags=...) at kernel/qeventloop.cpp:204
#8  0x00007fc236e40c5f in QThread::exec (this=this@entry=0xfc45a0) at thread/qthread.cpp:537
#9  0x00007fc236f25823 in QInotifyFileSystemWatcherEngine::run (this=0xfc45a0) at io/qfilesystemwatcher_inotify.cpp:265
#10 0x00007fc236e4332f in QThreadPrivate::start (arg=0xfc45a0) at thread/qthread_unix.cpp:349
#11 0x00007fc2312e4182 in start_thread (arg=0x7fc20a985700) at pthread_create.c:312
#12 0x00007fc23606230d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 3 (Thread 0x7fc17a0a6700 (LWP 7341)):
#0  0x00007fc236054fbd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fc22eb0bfe4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc22eb0c0ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc236f727be in QEventDispatcherGlib::processEvents (this=0x3941930, flags=...) at kernel/qeventdispatcher_glib.cpp:436
#4  0x00007fc236f440af in QEventLoop::processEvents (this=this@entry=0x7fc17a0a5aa0, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fc236f443a5 in QEventLoop::exec (this=this@entry=0x7fc17a0a5aa0, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007fc239cbbe43 in Digikam::WorkerObjectRunnable::run (this=0x7dc93d0) at /build/buildd/digikam-3.5.0/core/libs/threads/threadmanager.cpp:196
#7  0x00007fc236e36fee in QThreadPoolThread::run (this=0x2b66d90) at concurrent/qthreadpool.cpp:108
#8  0x00007fc236e4332f in QThreadPrivate::start (arg=0x2b66d90) at thread/qthread_unix.cpp:349
#9  0x00007fc2312e4182 in start_thread (arg=0x7fc17a0a6700) at pthread_create.c:312
#10 0x00007fc23606230d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7fc1ecff9700 (LWP 7352)):
#0  unixCheckClockType () at tools/qelapsedtimer_unix.cpp:110
#1  QElapsedTimer::isMonotonic () at tools/qelapsedtimer_unix.cpp:111
#2  0x00007fc236f73eae in QTimerInfoList::repairTimersIfNeeded (this=0x7fc1740011a0) at kernel/qeventdispatcher_unix.cpp:413
#3  0x00007fc236f73f1b in QTimerInfoList::timerWait (this=0x7fc1740011a0, tm=...) at kernel/qeventdispatcher_unix.cpp:461
#4  0x00007fc236f7267c in timerSourcePrepareHelper (src=<optimized out>, timeout=0x7fc1ecff88e4) at kernel/qeventdispatcher_glib.cpp:143
#5  0x00007fc236f72725 in timerSourcePrepare (source=<optimized out>, timeout=<optimized out>) at kernel/qeventdispatcher_glib.cpp:176
#6  0x00007fc22eb0b68d in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007fc22eb0bf03 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#8  0x00007fc22eb0c0ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#9  0x00007fc236f727be in QEventDispatcherGlib::processEvents (this=0x7fc1740031d0, flags=...) at kernel/qeventdispatcher_glib.cpp:436
#10 0x00007fc236f440af in QEventLoop::processEvents (this=this@entry=0x7fc1ecff8aa0, flags=...) at kernel/qeventloop.cpp:149
#11 0x00007fc236f443a5 in QEventLoop::exec (this=this@entry=0x7fc1ecff8aa0, flags=...) at kernel/qeventloop.cpp:204
#12 0x00007fc239cbbe43 in Digikam::WorkerObjectRunnable::run (this=0x754a7b0) at /build/buildd/digikam-3.5.0/core/libs/threads/threadmanager.cpp:196
#13 0x00007fc236e36fee in QThreadPoolThread::run (this=0x2b67c40) at concurrent/qthreadpool.cpp:108
#14 0x00007fc236e4332f in QThreadPrivate::start (arg=0x2b67c40) at thread/qthread_unix.cpp:349
#15 0x00007fc2312e4182 in start_thread (arg=0x7fc1ecff9700) at pthread_create.c:312
#16 0x00007fc23606230d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7fc23c641ac0 (LWP 7046)):
[KCrash Handler]
#6  0x0000000500000000 in ?? ()
#7  0x00007fc220bb0dac in sqlite3MemCompare (pMem1=pMem1@entry=0x7fffbfb6d7b0, pMem2=<optimized out>, pColl=0x78a0928) at sqlite3.c:60484
#8  0x00007fc220bb0f63 in sqlite3VdbeRecordCompare (nKey1=24, pKey1=0x7fc20c04ba2e, pPKey2=pPKey2@entry=0x7fffbfb6dab0) at sqlite3.c:64162
#9  0x00007fc220bc5579 in sqlite3BtreeMovetoUnpacked (pCur=0x713fd20, pIdxKey=0x7fffbfb6dab0, intKey=0, biasRight=<optimized out>, pRes=0x7fffbfb6daa0) at sqlite3.c:55077
#10 0x00007fc220bed9c5 in sqlite3VdbeExec (p=p@entry=0x717ea98) at sqlite3.c:70168
#11 0x00007fc220bf5ed7 in sqlite3Step (p=0x717ea98) at sqlite3.c:64828
#12 sqlite3_step (pStmt=<optimized out>) at sqlite3.c:64894
#13 0x00007fc2101c711c in QSQLiteResultPrivate::fetchNext (this=this@entry=0x479c920, values=..., idx=idx@entry=0, initialFetch=initialFetch@entry=true) at ../../../sql/drivers/sqlite/qsql_sqlite.cpp:235
#14 0x00007fc2101c7e48 in QSQLiteResult::exec (this=0x75645e0) at ../../../sql/drivers/sqlite/qsql_sqlite.cpp:447
#15 0x00007fc23c268b7d in QSqlQuery::exec (this=this@entry=0x7fffbfb6dfe8) at kernel/qsqlquery.cpp:949
#16 0x00007fc239c75a26 in Digikam::DatabaseCoreBackend::exec (this=0x14738d0, query=...) at /build/buildd/digikam-3.5.0/core/libs/database/core/databasecorebackend.cpp:1414
#17 0x00007fc239c75aac in Digikam::DatabaseCoreBackend::execQuery (this=this@entry=0x14738d0, query=..., boundValue1=...) at /build/buildd/digikam-3.5.0/core/libs/database/core/databasecorebackend.cpp:1056
#18 0x00007fc239c76b50 in Digikam::DatabaseCoreBackend::execQuery (this=this@entry=0x14738d0, sql=..., boundValue1=...) at /build/buildd/digikam-3.5.0/core/libs/database/core/databasecorebackend.cpp:1005
#19 0x00007fc239c76b99 in Digikam::DatabaseCoreBackend::execSql (this=0x14738d0, sql=..., boundValue1=..., values=values@entry=0x7fffbfb6e030, lastInsertId=lastInsertId@entry=0x0) at /build/buildd/digikam-3.5.0/core/libs/database/core/databasecorebackend.cpp:902
#20 0x00007fc23963a42e in Digikam::AlbumDB::getSetting (this=this@entry=0x11ab220, keyword=...) at /build/buildd/digikam-3.5.0/core/libs/database/albumdb.cpp:972
#21 0x00007fc23963ad5c in Digikam::AlbumDB::getFilterSettings (this=0x11ab220, imageFilter=imageFilter@entry=0x7fffbfb6e270, videoFilter=videoFilter@entry=0x0, audioFilter=audioFilter@entry=0x0) at /build/buildd/digikam-3.5.0/core/libs/database/albumdb.cpp:1017
#22 0x000000000063a2c0 in Digikam::AlbumSettings::getRawFileFilter (this=this@entry=0x1104250) at /build/buildd/digikam-3.5.0/core/digikam/utils/albumsettings.cpp:958
#23 0x0000000000533f42 in Digikam::KipiInterface::hostSetting (this=this@entry=0x1f849d0, settingName=...) at /build/buildd/digikam-3.5.0/core/utilities/kipiiface/kipiinterface.cpp:363
#24 0x00000000005339f4 in Digikam::KipiInterface::currentAlbum (this=0x1f849d0) at /build/buildd/digikam-3.5.0/core/utilities/kipiiface/kipiinterface.cpp:110
#25 0x00007fc17fdeed94 in KIPIAdvancedSlideshowPlugin::Plugin_AdvancedSlideshow::slotAlbumChanged (this=0x35602c0, anyAlbum=<optimized out>) at /build/buildd/digikam-3.5.0/extra/kipi-plugins/advancedslideshow/plugin/plugin_advancedslideshow.cpp:175
#26 0x00007fc236f5987a in QMetaObject::activate (sender=0x1f849d0, m=m@entry=0x7fc23a7cce60 <KIPI::Interface::staticMetaObject>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x7fffbfb6e5c0) at kernel/qobject.cpp:3539
#27 0x00007fc23a5b94c2 in KIPI::Interface::currentAlbumChanged (this=<optimized out>, _t1=true) at ./interface.moc:128
#28 0x00007fc236f5987a in QMetaObject::activate (sender=0x15acb70, m=m@entry=0x844e60 <Digikam::AlbumManager::staticMetaObject>, local_signal_index=local_signal_index@entry=6, argv=argv@entry=0x7fffbfb6e6f0) at kernel/qobject.cpp:3539
#29 0x00000000005a2e04 in signalAlbumCurrentChanged (_t1=0x7147690, this=<optimized out>) at /build/buildd/digikam-3.5.0/obj-x86_64-linux-gnu/core/digikam/albummanager.moc:267
#30 Digikam::AlbumManager::setCurrentAlbum (this=<optimized out>, album=<optimized out>) at /build/buildd/digikam-3.5.0/core/digikam/album/albummanager.cpp:1846
#31 0x000000000065dd99 in Digikam::DigikamView::slotLeftSidebarChangedTab (this=<optimized out>, w=<optimized out>) at /build/buildd/digikam-3.5.0/core/digikam/views/digikamview.cpp:1874
#32 0x0000000000661f76 in Digikam::DigikamView::qt_static_metacall (_o=<optimized out>, _id=<optimized out>, _a=<optimized out>, _c=<optimized out>) at /build/buildd/digikam-3.5.0/obj-x86_64-linux-gnu/core/digikam/digikamview.moc:337
#33 0x00007fc236f5987a in QMetaObject::activate (sender=0x18bf040, m=m@entry=0x7fc23a0c2820 <Digikam::Sidebar::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fffbfb6e8b0) at kernel/qobject.cpp:3539
#34 0x00007fc239ce123f in Digikam::Sidebar::signalChangedTab (this=<optimized out>, _t1=0x20a8830) at /build/buildd/digikam-3.5.0/obj-x86_64-linux-gnu/core/digikam/sidebar.moc:111
#35 0x00007fc239ce203e in Digikam::Sidebar::setActiveTab (this=<optimized out>, w=<optimized out>) at /build/buildd/digikam-3.5.0/core/libs/widgets/common/sidebar.cpp:357
#36 0x000000000065bb90 in slotLeftSideBarActivate (widget=<optimized out>, this=0x14867b0) at /build/buildd/digikam-3.5.0/core/digikam/views/digikamview.cpp:2011
#37 Digikam::DigikamView::slotNewDuplicatesSearch (this=0x14867b0, album=album@entry=0x0) at /build/buildd/digikam-3.5.0/core/digikam/views/digikamview.cpp:920
#38 0x000000000066224c in Digikam::DigikamView::qt_static_metacall (_o=<optimized out>, _id=<optimized out>, _a=<optimized out>, _c=<optimized out>) at /build/buildd/digikam-3.5.0/obj-x86_64-linux-gnu/core/digikam/digikamview.moc:294
#39 0x00007fc236f5987a in QMetaObject::activate (sender=sender@entry=0x2db93f0, m=m@entry=0x7fc2383e1de0 <QAction::staticMetaObject>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x7fffbfb6ea50) at kernel/qobject.cpp:3539
#40 0x00007fc237931a62 in QAction::triggered (this=this@entry=0x2db93f0, _t1=false) at .moc/release-shared/moc_qaction.cpp:276
#41 0x00007fc237933433 in QAction::activate (this=this@entry=0x2db93f0, event=event@entry=QAction::Trigger) at kernel/qaction.cpp:1257
#42 0x00007fc237d61489 in QMenuPrivate::activateCausedStack (this=this@entry=0x2e6cbe0, causedStack=..., action=action@entry=0x2db93f0, action_e=action_e@entry=QAction::Trigger, self=self@entry=true) at widgets/qmenu.cpp:1038
#43 0x00007fc237d659b9 in QMenuPrivate::activateAction (this=0x2e6cbe0, action=0x2db93f0, action_e=action_e@entry=QAction::Trigger, self=self@entry=true) at widgets/qmenu.cpp:1130
#44 0x00007fc237d69385 in QMenu::mouseReleaseEvent (this=this@entry=0x35a6c60, e=e@entry=0x7fffbfb6f180) at widgets/qmenu.cpp:2372
#45 0x00007fc2386f94f5 in KMenu::mouseReleaseEvent (this=0x35a6c60, e=0x7fffbfb6f180) at ../../kdeui/widgets/kmenu.cpp:464
#46 0x00007fc23798750a in QWidget::event (this=this@entry=0x35a6c60, event=event@entry=0x7fffbfb6f180) at kernel/qwidget.cpp:8376
#47 0x00007fc237d697bb in QMenu::event (this=0x35a6c60, e=0x7fffbfb6f180) at widgets/qmenu.cpp:2481
#48 0x00007fc237937e2c in QApplicationPrivate::notify_helper (this=this@entry=0xf6f310, receiver=receiver@entry=0x35a6c60, e=e@entry=0x7fffbfb6f180) at kernel/qapplication.cpp:4567
#49 0x00007fc23793e5dd in QApplication::notify (this=this@entry=0x7fffbfb6fdc0, receiver=receiver@entry=0x35a6c60, e=e@entry=0x7fffbfb6f180) at kernel/qapplication.cpp:4110
#50 0x00007fc238642baa in KApplication::notify (this=0x7fffbfb6fdc0, receiver=0x35a6c60, event=0x7fffbfb6f180) at ../../kdeui/kernel/kapplication.cpp:311
#51 0x00007fc236f454dd in QCoreApplication::notifyInternal (this=0x7fffbfb6fdc0, receiver=receiver@entry=0x35a6c60, event=event@entry=0x7fffbfb6f180) at kernel/qcoreapplication.cpp:953
#52 0x00007fc23793dd93 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#53 QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x35a6c60, event=event@entry=0x7fffbfb6f180, alienWidget=alienWidget@entry=0x0, nativeWidget=nativeWidget@entry=0x35a6c60, buttonDown=buttonDown@entry=0x7fc23841d318 <qt_button_down>, lastMouseReceiver=..., spontaneous=spontaneous@entry=true) at kernel/qapplication.cpp:3178
#54 0x00007fc2379b2cfc in QETWidget::translateMouseEvent (this=this@entry=0x35a6c60, event=event@entry=0x7fffbfb6f4d0) at kernel/qapplication_x11.cpp:4568
#55 0x00007fc2379b2269 in QApplication::x11ProcessEvent (this=0x7fffbfb6fdc0, event=event@entry=0x7fffbfb6f4d0) at kernel/qapplication_x11.cpp:3627
#56 0x00007fc2379d9b02 in x11EventSourceDispatch (s=0xf6e760, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#57 0x00007fc22eb0be04 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#58 0x00007fc22eb0c048 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#59 0x00007fc22eb0c0ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#60 0x00007fc236f727a1 in QEventDispatcherGlib::processEvents (this=0xf68f20, flags=...) at kernel/qeventdispatcher_glib.cpp:434
#61 0x00007fc2379d9bb6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#62 0x00007fc236f440af in QEventLoop::processEvents (this=this@entry=0x7fffbfb6f8a0, flags=...) at kernel/qeventloop.cpp:149
#63 0x00007fc236f443a5 in QEventLoop::exec (this=this@entry=0x7fffbfb6f8a0, flags=...) at kernel/qeventloop.cpp:204
#64 0x00007fc236f49b79 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1225
#65 0x00007fc23793637c in QApplication::exec () at kernel/qapplication.cpp:3828
#66 0x0000000000492023 in main (argc=<optimized out>, argv=<optimized out>) at /build/buildd/digikam-3.5.0/core/digikam/main/main.cpp:235

Possible duplicates by query: bug 333792, bug 333791, bug 333790, bug 333741, bug 333700.

Reported using DrKonqi