Application: akonadi_imap_resource (4.88.0)
 (Compiled from sources)
Qt Version: 5.5.0
Operating System: Linux 4.1.2-2-ARCH x86_64
Distribution (Platform): Archlinux Packages

-- Information about the crash:
second time I hit tihs assert in resourcebase.cpp:

        Q_ASSERT_X(scheduler->currentTask().type == ResourceScheduler::SyncCollection,
                   "createItemSyncInstance", "Calling items retrieval methods although no item retrieval is in progress");

not sure how to reproduce it yet, seems to happen sporadically and may or may not be related to lack of an internet connection

The crash can be reproduced sometimes.

-- Backtrace:
Application: Akonadi Resource (akonadi_imap_resource), signal: Aborted
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f59dd903840 (LWP 2647))]

Thread 6 (Thread 0x7f59dc068700 (LWP 2692)):
#0  0x00007f59ea758e8d in poll () from /usr/lib/libc.so.6
#1  0x00007f59e7d869f2 in ?? () from /usr/lib/libxcb.so.1
#2  0x00007f59e7d8856f in xcb_wait_for_event () from /usr/lib/libxcb.so.1
#3  0x00007f59dd157ca9 in ?? () from /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f59eb372a9e in ?? () from /usr/lib/libQt5Core.so.5
#5  0x00007f59e7fd9354 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007f59ea761bfd in clone () from /usr/lib/libc.so.6

Thread 5 (Thread 0x7f59d9d69700 (LWP 2773)):
#0  0x00007f59ea754f1d in read () from /usr/lib/libc.so.6
#1  0x00007f59e6764f60 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007f59e672172c in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#3  0x00007f59e6721c20 in ?? () from /usr/lib/libglib-2.0.so.0
#4  0x00007f59e6721d8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#5  0x00007f59eb5aa25b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#6  0x00007f59eb55126a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#7  0x00007f59eb36daf4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#8  0x00007f59eb372a9e in ?? () from /usr/lib/libQt5Core.so.5
#9  0x00007f59e7fd9354 in start_thread () from /usr/lib/libpthread.so.0
#10 0x00007f59ea761bfd in clone () from /usr/lib/libc.so.6

Thread 4 (Thread 0x7f59d9568700 (LWP 27665)):
#0  0x00007f59e67663f9 in g_mutex_lock () from /usr/lib/libglib-2.0.so.0
#1  0x00007f59e67217d6 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#2  0x00007f59e6721ce0 in ?? () from /usr/lib/libglib-2.0.so.0
#3  0x00007f59e6721d8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#4  0x00007f59eb5aa25b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#5  0x00007f59eb55126a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#6  0x00007f59eb36daf4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#7  0x00007f59eb372a9e in ?? () from /usr/lib/libQt5Core.so.5
#8  0x00007f59e7fd9354 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007f59ea761bfd in clone () from /usr/lib/libc.so.6

Thread 3 (Thread 0x7f59cb5aa700 (LWP 1651)):
#0  0x00007f59e67212b1 in g_main_context_prepare () from /usr/lib/libglib-2.0.so.0
#1  0x00007f59e6721ba8 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007f59e6721d8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007f59eb5aa25b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#4  0x00007f59eb55126a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#5  0x00007f59eb36daf4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#6  0x00007f59eb372a9e in ?? () from /usr/lib/libQt5Core.so.5
#7  0x00007f59e7fd9354 in start_thread () from /usr/lib/libpthread.so.0
#8  0x00007f59ea761bfd in clone () from /usr/lib/libc.so.6

Thread 2 (Thread 0x7f59ca148700 (LWP 9373)):
#0  0x00007f59e7fded18 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#1  0x00007f59eb373c66 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQt5Core.so.5
#2  0x00007f59eb36f723 in ?? () from /usr/lib/libQt5Core.so.5
#3  0x00007f59eb372a9e in ?? () from /usr/lib/libQt5Core.so.5
#4  0x00007f59e7fd9354 in start_thread () from /usr/lib/libpthread.so.0
#5  0x00007f59ea761bfd in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x7f59dd903840 (LWP 2647)):
[KCrash Handler]
#6  0x00007f59ea6ad528 in raise () from /usr/lib/libc.so.6
#7  0x00007f59ea6ae93a in abort () from /usr/lib/libc.so.6
#8  0x00007f59eb360f31 in QMessageLogger::fatal(char const*, ...) const () from /usr/lib/libQt5Core.so.5
#9  0x00007f59eb35c101 in qt_assert_x(char const*, char const*, char const*, int) () from /usr/lib/libQt5Core.so.5
#10 0x00007f59eec8bae6 in Akonadi::ResourceBasePrivate::createItemSyncInstanceIfMissing (this=0x1f65c20) at /home/milian/projects/kf5/src/kde/kdepimlibs/akonadi/src/agentbase/resourcebase.cpp:186
#11 0x00007f59eec8747a in Akonadi::ResourceBase::setItemStreamingEnabled (this=0x1f5beb0, enable=true) at /home/milian/projects/kf5/src/kde/kdepimlibs/akonadi/src/agentbase/resourcebase.cpp:1257
#12 0x0000000000492406 in ImapResourceBase::retrieveItems (this=0x1f5beb0, col=...) at /home/milian/projects/kf5/src/kde/kdepim-runtime/resources/imap/imapresourcebase.cpp:437
#13 0x00007f59eec852d7 in Akonadi::ResourceBasePrivate::slotItemRetrievalCollectionFetchDone (this=0x1f65c20, job=0x1fd9df0) at /home/milian/projects/kf5/src/kde/kdepimlibs/akonadi/src/agentbase/resourcebase.cpp:951
#14 0x00007f59eec89d34 in Akonadi::ResourceBase::qt_static_metacall (_o=0x1f5beb0, _c=QMetaObject::InvokeMetaMethod, _id=42, _a=0x7ffc6f9852c0) at /home/milian/projects/kf5/build/kde/kdepimlibs/akonadi/src/agentbase/moc_resourcebase.cpp:294
#15 0x00007f59eb581fea in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQt5Core.so.5
#16 0x00007f59ed51a13f in KJob::result (this=0x1fd9df0, _t1=0x1fd9df0) at /home/milian/projects/kf5/build/frameworks/kcoreaddons/src/lib/moc_kjob.cpp:552
#17 0x00007f59ed51958e in KJob::emitResult (this=0x1fd9df0) at /home/milian/projects/kf5/src/frameworks/kcoreaddons/src/lib/jobs/kjob.cpp:294
#18 0x00007f59eead525e in Akonadi::JobPrivate::delayedEmitResult (this=0x1ea2cf0) at /home/milian/projects/kf5/src/kde/kdepimlibs/akonadi/src/core/jobs/job.cpp:153
#19 0x00007f59eead6722 in Akonadi::Job::qt_static_metacall (_o=0x1fd9df0, _c=QMetaObject::InvokeMetaMethod, _id=7, _a=0x1fc4c00) at /home/milian/projects/kf5/build/kde/kdepimlibs/akonadi/src/core/moc_job.cpp:107
#20 0x00007f59eb582eb1 in QObject::event(QEvent*) () from /usr/lib/libQt5Core.so.5
#21 0x00007f59ec74a00c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#22 0x00007f59ec74f4e6 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#23 0x00007f59eb55389b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#24 0x00007f59eb555c96 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQt5Core.so.5
#25 0x00007f59eb5a9e33 in ?? () from /usr/lib/libQt5Core.so.5
#26 0x00007f59e67219fd in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#27 0x00007f59e6721ce0 in ?? () from /usr/lib/libglib-2.0.so.0
#28 0x00007f59e6721d8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#29 0x00007f59eb5aa23f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#30 0x00007f59eb55126a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#31 0x00007f59eb55920c in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#32 0x00007f59eec81c83 in Akonadi::ResourceBase::init (r=0x1f5beb0) at /home/milian/projects/kf5/src/kde/kdepimlibs/akonadi/src/agentbase/resourcebase.cpp:599
#33 0x000000000046b49f in Akonadi::ResourceBase::init<ImapResource> (argc=3, argv=0x7ffc6f985b18) at /home/milian/projects/compiled/kf5/include/KF5/AkonadiAgentBase/resourcebase.h:193
#34 0x000000000046b382 in main (argc=3, argv=0x7ffc6f985b18) at /home/milian/projects/kf5/src/kde/kdepim-runtime/resources/imap/main.cpp:22

Report to https://bugs.kde.org/

Reproducible: Sometimes