I just had my 2nd hang in a context browser popup, this time one I triggered myself in order to jump to a variable definition in some header file. The (partial) backtrace: #0 0x00007fc4df38b93d in nanosleep () at ../sysdeps/unix/syscall-template.S:81 #1 0x00007fc4dfc8488d in qt_nanosleep (amount=...) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.8.0/qtbase/src/corelib/kernel/qelapsedtimer_unix.cpp:195 #2 0x00007fc4dfa67134 in QThread::usleep (usecs=usecs@entry=500) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.8.0/qtbase/src/corelib/thread/qthread_unix.cpp:511 #3 0x00007fc4dd52babe in KDevelop::DUChainLock::lockForWrite ( this=0x7fc4ddcc8ce0 <KDevelop::(anonymous namespace)::Q_QGS_sdDUChainPrivate::innerFunction()::holder+32>, timeout=0) at /opt/local/var/lnxports/build/_opt_local_site-ports_kf5_kdevplatform5/kf5-kdevplatform-devel/work/kf5-kdevplatform-5/language/duchain/duchainlock.cpp:155 #4 0x00007fc4dd52bcdc in KDevelop::DUChainWriteLocker::lock (this=0x7ffe666ff340) at /opt/local/var/lnxports/build/_opt_local_site-ports_kf5_kdevplatform5/kf5-kdevplatform-devel/work/kf5-kdevplatform-5/language/duchain/duchainlock.cpp:249 #5 0x00007fc4dd4d3526 in KDevelop::DUChain::documentLoadedPrepare (this=0x17dbc60, doc=0x947bb80) at /opt/local/var/lnxports/build/_opt_local_site-ports_kf5_kdevplatform5/kf5-kdevplatform-devel/work/kf5-kdevplatform-5/language/duchain/duchain.cpp:1504 #6 0x00007fc4dfc5e32e in call (a=0x7ffe666ff4c0, r=0x17dbc60, this=<optimised out>) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtCore/../../src/corelib/kernel/qobject_impl.h:101 #7 QMetaObject::activate (sender=0x1624d10, signalOffset=<optimised out>, local_signal_index=local_signal_index@entry=9, argv=argv@entry=0x7ffe666ff4c0) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.8.0/qtbase/src/corelib/kernel/qobject.cpp:3723 #8 0x00007fc4dfc5e8c7 in QMetaObject::activate (sender=<optimised out>, m=m@entry=0x7fc4e1ca76a0 <KDevelop::IDocumentController::staticMetaObject>, local_signal_index=local_signal_index@entry=9, argv=argv@entry=0x7ffe666ff4c0) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.8.0/qtbase/src/corelib/kernel/qobject.cpp:3602 #9 0x00007fc4e1a93c52 in KDevelop::IDocumentController::documentLoadedPrepare (this=<optimised out>, _t1=<optimised out>, _t1@entry=0x947bb80) at /opt/local/var/lnxports/build/_opt_local_site-ports_kf5_kdevplatform5/kf5-kdevplatform-devel/work/build/interfaces/KDevPlatformInterfaces_automoc.dir/moc_idocumentcontr_BKHINBC3JP6LAY.cpp:565 #10 0x00007fc4e1a85960 in KDevelop::IDocument::notifyLoaded (this=0x947bb80) at /opt/local/var/lnxports/build/_opt_local_site-ports_kf5_kdevplatform5/kf5-kdevplatform-devel/work/kf5-kdevplatform-5/interfaces/idocument.cpp:130 #11 0x00007fc4dfc5e32e in call (a=0x7ffe666ff600, r=0x947bb60, this=<optimised out>) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtCore/../../src/corelib/kernel/qobject_impl.h:101 #12 QMetaObject::activate (sender=sender@entry=0xa20c060, signalOffset=<optimised out>, local_signal_index=local_signal_index@entry=15, argv=argv@entry=0x7ffe666ff600) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.8.0/qtbase/src/corelib/kernel/qobject.cpp:3723 #13 0x00007fc4dfc5e8c7 in QMetaObject::activate (sender=sender@entry=0xa20c060, m=<optimised out>, local_signal_index=local_signal_index@entry=15, argv=argv@entry=0x7ffe666ff600) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.8.0/qtbase/src/corelib/kernel/qobject.cpp:3602 #14 0x00007fc4dc2c4272 in KTextEditor::Document::textChanged(KTextEditor::Document*) (this=this@entry=0xa20c060, _t1=<optimised out>, _t1@entry=0xa20c060) at /opt/local/var/lnxports/build/_opt_local_site-ports_kf5_KF5-Frameworks/kf5-ktexteditor/work/build/src/KF5TextEditor_automoc.dir/moc_document_G7ZZNPEZ2BAWZM.cpp:577 ---Type <return> to continue, or q <return> to quit---q Quit (gdb) f 3 #3 0x00007fc4dd52babe in KDevelop::DUChainLock::lockForWrite ( this=0x7fc4ddcc8ce0 <KDevelop::(anonymous namespace)::Q_QGS_sdDUChainPrivate::innerFunction()::holder+32>, timeout=0) at /opt/local/var/lnxports/build/_opt_local_site-ports_kf5_kdevplatform5/kf5-kdevplatform-devel/work/kf5-kdevplatform-5/language/duchain/duchainlock.cpp:155 155 QThread::usleep(uSleepTime); (gdb) l 150 d->m_writerRecursion = 0; 151 } 152 } 153 154 if (!timeout || t.elapsed() < timeout) { 155 QThread::usleep(uSleepTime); 156 } else { 157 //Fail! 158 return false; 159 } (gdb) p timeout $1 = 0 (gdb) p timeout=1000 $3 = 1000 (gdb) p t.restart() $4 = -9222948135378 (gdb) p t.elapsed() $5 = 3613 (gdb) c Continuing. Wouldn't it be possible to use a "large" value for the timeout argument, rather than 0. I have no idea what triggered this; my system wasn't even particularly busy.
Created attachment 105625 [details] workaround patch I'll be running the attached patch to see just how often this occurs (and if 10-12 second timeouts are "reasonably eternal"). I don't know if there's any use to it, but I kinda like my idea to randomise the timeout so that theoretically only 1 of a series of deadlocked threads will ever time out :)
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This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!