Bug 486350

Application: akonadi_maildir_resource (5.24.5 (23.08.5))

Qt Version: 5.15.13
Frameworks Version: 5.115.0
Operating System: Linux 6.1.12-060112-generic x86_64
Windowing System: X11
Distribution: Ubuntu 24.04 LTS
DrKonqi: 5.27.11 [KCrashBackend]

-- Information about the crash:
When Kmail is configured with a lot of accounts (> 4), a lot of filters (>20) and large mail dirs a manual check causes sometimes the crash of akonadi_maildir_resource.
Restarting the akonadi_maildir_resource helps.

It seems there is a null pointer used (receiver=0x0) which is not checked:
#26 0x00007f5aa94db94b in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x55bd091cbf30) at kernel/qcoreapplication.cpp:1821

I think this happens as race condition.

The crash can be reproduced sometimes.

-- Backtrace:
Application: christoph.thielecke@gmx.de (akonadi_maildir_resource), signal: Segmentation fault

[KCrash Handler]
#4  0x00007f5aaa09ce99 in QHash<QByteArray, Akonadi::Attribute*>::findNode (ahp=0x0, akey=..., this=0x40) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qhash.h:945
#5  QHash<QByteArray, Akonadi::Attribute*>::contains (akey=..., this=0x40) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qhash.h:920
#6  Akonadi::AttributeStorage::hasAttribute (this=0x40, type=...) at /usr/src/akonadi-4:23.08.5-0ubuntu3/src/core/attributestorage.cpp:69
#7  0x00007f5aaa0bb570 in Akonadi::Collection::hasAttribute (this=this@entry=0x55bd0944d5d0, type=...) at /usr/src/akonadi-4:23.08.5-0ubuntu3/src/core/collection.cpp:163
#8  0x00007f5aaa442980 in Akonadi::Collection::hasAttribute<Akonadi::SpecialCollectionAttribute> (this=0x55bd0944d5d0) at /usr/src/akonadi-4:23.08.5-0ubuntu3/src/core/collection.h:595
#9  (anonymous namespace)::sortCollectionsForSync (l=..., r=...) at /usr/src/akonadi-4:23.08.5-0ubuntu3/src/agentbase/resourcebase.cpp:855
#10 0x00007f5aaa447290 in __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(Akonadi::Collection const&, Akonadi::Collection const&)>::operator()<QTypedArrayData<Akonadi::Collection>::iterator, QTypedArrayData<Akonadi::Collection>::iterator> (__it2=..., __it1=..., this=<synthetic pointer>) at /usr/include/c++/13/bits/predefined_ops.h:158
#11 std::__unguarded_partition<QTypedArrayData<Akonadi::Collection>::iterator, __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(Akonadi::Collection const&, Akonadi::Collection const&)> > (__comp=..., __pivot=..., __last=..., __first=...) at /usr/include/c++/13/bits/stl_algo.h:1880
#12 std::__unguarded_partition_pivot<QTypedArrayData<Akonadi::Collection>::iterator, __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(Akonadi::Collection const&, Akonadi::Collection const&)> > (__comp=..., __last=..., __first=...) at /usr/include/c++/13/bits/stl_algo.h:1899
#13 std::__introsort_loop<QTypedArrayData<Akonadi::Collection>::iterator, int, __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(Akonadi::Collection const&, Akonadi::Collection const&)> > (__first=..., __last=..., __depth_limit=<optimized out>, __comp=__comp@entry=...) at /usr/include/c++/13/bits/stl_algo.h:1930
#14 0x00007f5aaa4408d2 in std::__sort<QTypedArrayData<Akonadi::Collection>::iterator, __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(Akonadi::Collection const&, Akonadi::Collection const&)> > (__comp=..., __last=..., __first=...) at /usr/include/c++/13/bits/stl_algo.h:1947
#15 std::sort<QTypedArrayData<Akonadi::Collection>::iterator, bool (*)(Akonadi::Collection const&, Akonadi::Collection const&)> (__first=..., __last=..., __comp=0x7f5aaa442850 <(anonymous namespace)::sortCollectionsForSync(Akonadi::Collection const&, Akonadi::Collection const&)>) at /usr/include/c++/13/bits/stl_algo.h:4894
#16 Akonadi::ResourceBasePrivate::slotLocalListDone (this=0x55bd0942ca20, job=<optimized out>) at /usr/src/akonadi-4:23.08.5-0ubuntu3/src/agentbase/resourcebase.cpp:897
#17 0x00007f5aa9512e16 in QtPrivate::QSlotObjectBase::call (a=0x7fff9c665c90, r=0x55bd0942ca20, this=0x55bd09c61e40) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
#18 doActivate<false> (sender=0x55bd09c53200, signal_index=6, argv=0x7fff9c665c90) at kernel/qobject.cpp:3925
#19 0x00007f5aa950b697 in QMetaObject::activate (sender=sender@entry=0x55bd09c53200, m=<optimized out>, local_signal_index=local_signal_index@entry=3, argv=argv@entry=0x7fff9c665c90) at kernel/qobject.cpp:3985
#20 0x00007f5aaa2cd266 in KJob::result (this=this@entry=0x55bd09c53200, _t1=<optimized out>, _t1@entry=0x55bd09c53200, _t2=...) at /usr/src/kcoreaddons-5.115.0-0ubuntu5/obj-x86_64-linux-gnu/src/lib/KF5CoreAddons_autogen/include/moc_kjob.cpp:633
#21 0x00007f5aaa2d30eb in KJob::finishJob (this=0x55bd09c53200, emitResult=<optimized out>) at /usr/src/kcoreaddons-5.115.0-0ubuntu5/src/lib/jobs/kjob.cpp:98
#22 0x00007f5aa9506343 in QObject::event (this=0x55bd09c53200, e=0x55bd09a66070) at kernel/qobject.cpp:1347
#23 0x00007f5aa996bd45 in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x55bd09c53200, e=0x55bd09a66070) at kernel/qapplication.cpp:3640
#24 0x00007f5aa94d8118 in QCoreApplication::notifyInternal2 (receiver=0x55bd09c53200, event=0x55bd09a66070) at kernel/qcoreapplication.cpp:1064
#25 0x00007f5aa94d8332 in QCoreApplication::sendEvent (receiver=<optimized out>, event=<optimized out>) at kernel/qcoreapplication.cpp:1462
#26 0x00007f5aa94db94b in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x55bd091cbf30) at kernel/qcoreapplication.cpp:1821
#27 0x00007f5aa94dbebd in QCoreApplication::sendPostedEvents (receiver=<optimized out>, event_type=<optimized out>) at kernel/qcoreapplication.cpp:1680
#28 0x00007f5aa9535c0f in postEventSourceDispatch (s=0x55bd09385400) at kernel/qeventdispatcher_glib.cpp:277
#29 0x00007f5aa91145b5 in ??? () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#30 0x00007f5aa9173717 in ??? () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#31 0x00007f5aa9113a53 in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#32 0x00007f5aa9535279 in QEventDispatcherGlib::processEvents (this=0x55bd09389ff0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#33 0x00007f5aa94d6a7b in QEventLoop::exec (this=this@entry=0x7fff9c6660c0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:69
#34 0x00007f5aa94df3e8 in QCoreApplication::exec () at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#35 0x000055bd07fc8874 in Akonadi::ResourceBase::init<MaildirResource> (argv=<optimized out>, argc=<optimized out>) at /usr/include/KPim5/AkonadiAgentBase/akonadi/resourcebase.h:184
#36 main (argc=<optimized out>, argv=<optimized out>) at /usr/src/kdepim-runtime-4:23.08.5-0ubuntu3/resources/maildir/main.cpp:9
[Inferior 1 (process 18928) detached]

Reported using DrKonqi