[Akonadi] [Bug 363741] akonadi server 16.04.1: crashing every few seconds

[Jan-Matthias Braun via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=363741

--- Comment #9 from Jan-Matthias Braun <jan_braun at gmx.net> ---
Connecting into the running process indeed provides a better backtrace,
although -- why? :-)

Here it is:
#0  0x0000000000000000 in ?? ()
#1  0x00007f6ef42d333b in ExternalPostList::ExternalPostList
(this=0x7f6f0835a170, db=..., source_=<optimized out>, factor_=<optimized out>, 
    matcher=0x7f6f137fcd30) at matcher/externalpostlist.cc:40
#2  0x00007f6ef41e6d6b in Xapian::Internal::QueryPostingSource::postlist
(this=<optimized out>, qopt=0x7f6f137fc650, factor=1)
    at api/queryinternal.cc:739
#3  0x00007f6ef41e50a1 in Xapian::Query::Internal::postlist_sub_xor
(this=<optimized out>, ctx=..., qopt=<optimized out>, 
    factor=<optimized out>) at api/queryinternal.cc:634
#4  0x00007f6ef41e6553 in Xapian::Internal::QueryBranch::do_or_like
(this=this at entry=0x7f6f0807b490, ctx=..., 
    qopt=qopt at entry=0x7f6f137fc650, factor=factor at entry=1,
elite_set_size=elite_set_size at entry=0, first=first at entry=1)
    at api/queryinternal.cc:1186
#5  0x00007f6ef41e6b1a in Xapian::Internal::QueryAndMaybe::postlist
(this=0x7f6f0807b490, qopt=0x7f6f137fc650, factor=1)
    at api/queryinternal.cc:1550
#6  0x00007f6ef42d35fa in LocalSubMatch::get_postlist (this=0x7f6f0807af50,
matcher=0x7f6f137fcd30, total_subqs_ptr=0x7f6f137fc7bc)
    at matcher/localsubmatch.cc:204
#7  0x00007f6ef42d9a51 in MultiMatch::get_mset (this=this at entry=0x7f6f137fcd30,
first=first at entry=0, maxitems=100000, 
    check_at_least=check_at_least at entry=100000, mset=..., stats=...,
mdecider=0x0, sorter=0x0) at matcher/multimatch.cc:419
#8  0x00007f6ef41d55e1 in Xapian::Enquire::Internal::get_mset
(this=0x7f6f0807ad10, first=<optimized out>, maxitems=<optimized out>, 
    check_at_least=<optimized out>, check_at_least at entry=0,
rset=rset at entry=0x0, mdecider=0x0) at api/omenquire.cc:548
#9  0x00007f6ef41d5924 in Xapian::Enquire::get_mset
(this=this at entry=0x7f6f137fd050, first=<optimized out>, maxitems=<optimized
out>, 
    check_at_least=check_at_least at entry=0, rset=rset at entry=0x0, mdecider=0x0)
at api/omenquire.cc:906
#10 0x00007f6ee05e968d in Akonadi::Search::XapianSearchStore::exec
(this=0x7f6ef009bf50, query=...)
    at
/var/tmp/portage/kde-apps/akonadi-search-16.04.49.9999/work/akonadi-search-16.04.49.9999/xapian/xapiansearchstore.cpp:177
#11 0x00007f6f12df8065 in Akonadi::Search::Query::exec
(this=this at entry=0x7f6f137fd2c0)
    at
/var/tmp/portage/kde-apps/akonadi-search-16.04.49.9999/work/akonadi-search-16.04.49.9999/core/query.cpp:252
#12 0x00007f6f180fff7d in SearchPlugin::search (this=<optimized out>,
akonadiQuery=..., collections=..., mimeTypes=...)
    at
/var/tmp/portage/kde-apps/akonadi-search-16.04.49.9999/work/akonadi-search-16.04.49.9999/akonadiplugin/searchplugin.cpp:348
#13 0x000000000055b4eb in Akonadi::Server::SearchRequest::searchPlugins
(this=this at entry=0x7f6f137fd900)
    at
/var/tmp/portage/kde-apps/akonadi-16.04.49.9999/work/akonadi-16.04.49.9999/src/server/search/searchrequest.cpp:112
#14 0x000000000055b893 in Akonadi::Server::SearchRequest::exec
(this=this at entry=0x7f6f137fd900)
    at
/var/tmp/portage/kde-apps/akonadi-16.04.49.9999/work/akonadi-16.04.49.9999/src/server/search/searchrequest.cpp:123
#15 0x0000000000444788 in Akonadi::Server::SearchManager::updateSearchImpl
(this=0x27003f0, collection=..., cond=<optimized out>)
    at
/var/tmp/portage/kde-apps/akonadi-16.04.49.9999/work/akonadi-16.04.49.9999/src/server/search/searchmanager.cpp:350
#16 0x00007f6f1f8deaa9 in QObject::event (this=0x27003f0, e=<optimized out>) at
kernel/qobject.cpp:1263
#17 0x00007f6f1f8b2b5b in doNotify (event=0x7f6f08031ea0, receiver=0x27003f0)
at kernel/qcoreapplication.cpp:1063
#18 QCoreApplication::notify (event=<optimized out>, receiver=<optimized out>,
this=<optimized out>) at kernel/qcoreapplication.cpp:1049
#19 QCoreApplication::notifyInternal2 (receiver=0x27003f0,
event=event at entry=0x7f6f08031ea0) at kernel/qcoreapplication.cpp:988
#20 0x00007f6f1f8b526b in QCoreApplication::sendEvent (event=0x7f6f08031ea0,
receiver=<optimized out>) at kernel/qcoreapplication.h:231
#21 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver at entry=0x0,
event_type=event_type at entry=0, data=0x2700600)
    at kernel/qcoreapplication.cpp:1649
#22 0x00007f6f1f8b56d8 in QCoreApplication::sendPostedEvents
(receiver=receiver at entry=0x0, event_type=event_type at entry=0)
    at kernel/qcoreapplication.cpp:1503
#23 0x00007f6f1f9063f3 in postEventSourceDispatch (s=0x7f6f080012d0) at
kernel/qeventdispatcher_glib.cpp:276
#24 0x00007f6f1dd2eb17 in g_main_context_dispatch () from
/usr/lib64/libglib-2.0.so.0
#25 0x00007f6f1dd2f4f8 in g_main_context_iterate.isra () from
/usr/lib64/libglib-2.0.so.0
#26 0x00007f6f1dd2f68c in g_main_context_iteration () from
/usr/lib64/libglib-2.0.so.0
#27 0x00007f6f1f9067ff in QEventDispatcherGlib::processEvents
(this=0x7f6f080008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#28 0x00007f6f1f8b0b1a in QEventLoop::exec (this=this at entry=0x7f6f137fde80,
flags=..., flags at entry=...) at kernel/qeventloop.cpp:210
#29 0x00007f6f1f6d2214 in QThread::exec (this=<optimized out>) at
thread/qthread.cpp:507
#30 0x00007f6f1f6d6e78 in QThreadPrivate::start (arg=0x27004c0) at
thread/qthread_unix.cpp:344
#31 0x00007f6f1ee5c434 in start_thread () from /lib64/libpthread.so.0
#32 0x00007f6f1f158ded in clone () from /lib64/libc.so.6

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