the backtrace looks fishy, and a crash in the dynamic_cast means it tried to cast an invalid item. Please run KDevelop through valgrind and reproduce.

Created attachment 54166 [details]
valgrind log

(In reply to comment #2)
> Created an attachment (id=54166) [details]
> valgrind log

when it crashed, i produced this backtrace, but it seems to be valgrind-related

#0  vgModuleLocal_do_syscall_for_client_WRK () at m_syswrap/syscall-amd64-linux.S:147
#1  0x0000000000000008 in ?? ()
#2  0x0000000409177de0 in ?? ()
#3  0x0000000409177e20 in ?? ()
#4  0x0000000038eada80 in vgPlain_threads ()
#5  0x0000000000000023 in ?? ()
#6  0x0000000038eada80 in vgPlain_threads ()
#7  0x0000000039268100 in syscallInfo ()
#8  0x0000000409177e20 in ?? ()
#9  0x0000000000000001 in ?? ()
#10 0x0000000038eada70 in vgPlain_threads ()
#11 0x0000000039268070 in syscallInfo ()
#12 0x0000000038066766 in do_syscall_for_client (tid=1, trc=<value optimized out>) at m_syswrap/syswrap-main.c:308
#13 vgPlain_client_syscall (tid=1, trc=<value optimized out>) at m_syswrap/syswrap-main.c:1538
#14 0x0000000038062e73 in handle_syscall (tid=<value optimized out>, trc=<value optimized out>) at m_scheduler/scheduler.c:885
#15 0x000000003806460b in vgPlain_scheduler (tid=1) at m_scheduler/scheduler.c:1081
#16 0x000000003808e141 in thread_wrapper (tidW=<value optimized out>) at m_syswrap/syswrap-linux.c:94
#17 run_a_thread_NORETURN (tidW=<value optimized out>) at m_syswrap/syswrap-linux.c:127
#18 0x0000000000000000 in ?? ()

thanks

we need to use something safer than the foreach on a copy of the keys as they might get invalidated when a composite job gets killed and in turn delete it's child jobs.

commit 9057cee8d5be1fd69ec4897495be7feae7c3a384
branch 1.2
Author: Milian Wolff <mail@milianw.de>
Date:   Sat Dec 18 14:46:45 2010 +0100

    safely iterate over job list where kill can delete child jobs
    
    BUG: 258904

diff --git a/shell/runcontroller.cpp b/shell/runcontroller.cpp
index 6f595a1..6cb121e 100644
--- a/shell/runcontroller.cpp
+++ b/shell/runcontroller.cpp
@@ -589,7 +589,13 @@ void KDevelop::RunController::checkState()
 
 void KDevelop::RunController::stopAllProcesses()
 {
+    // composite jobs might remove child jobs, see also:
+    // https://bugs.kde.org/show_bug.cgi?id=258904
+    // foreach already iterates over a copy
     foreach (KJob* job, d->jobs.keys()) {
+        // now we check the real list whether it was deleted
+        if (!d->jobs.contains(job))
+            continue;
         if (job->capabilities() & KJob::Killable)
             job->kill(KJob::EmitResult);
     }

commit 229ca71317347dc5e1401bcffc52587e0dcad0e3
branch master
Author: Milian Wolff <mail@milianw.de>
Date:   Sat Dec 18 14:46:45 2010 +0100

    safely iterate over job list where kill can delete child jobs
    
    BUG: 258904

diff --git a/shell/runcontroller.cpp b/shell/runcontroller.cpp
index 6f595a1..6cb121e 100644
--- a/shell/runcontroller.cpp
+++ b/shell/runcontroller.cpp
@@ -589,7 +589,13 @@ void KDevelop::RunController::checkState()
 
 void KDevelop::RunController::stopAllProcesses()
 {
+    // composite jobs might remove child jobs, see also:
+    // https://bugs.kde.org/show_bug.cgi?id=258904
+    // foreach already iterates over a copy
     foreach (KJob* job, d->jobs.keys()) {
+        // now we check the real list whether it was deleted
+        if (!d->jobs.contains(job))
+            continue;
         if (job->capabilities() & KJob::Killable)
             job->kill(KJob::EmitResult);
     }

commit 91a5447e09851fdbf576fe4525619c03a518231e
branch 1.1
Author: Milian Wolff <mail@milianw.de>
Date:   Sat Dec 18 14:46:45 2010 +0100

    backport from 1.2: safely iterate over job list where kill can delete child jobs
    
    CCBUG: 258904

diff --git a/shell/runcontroller.cpp b/shell/runcontroller.cpp
index 213f724..63d4316 100644
--- a/shell/runcontroller.cpp
+++ b/shell/runcontroller.cpp
@@ -586,7 +586,13 @@ void KDevelop::RunController::checkState()
 
 void KDevelop::RunController::stopAllProcesses()
 {
+    // composite jobs might remove child jobs, see also:
+    // https://bugs.kde.org/show_bug.cgi?id=258904
+    // foreach already iterates over a copy
     foreach (KJob* job, d->jobs.keys()) {
+        // now we check the real list whether it was deleted
+        if (!d->jobs.contains(job))
+            continue;
         if (job->capabilities() & KJob::Killable)
             job->kill(KJob::EmitResult);
     }

*** Bug 262071 has been marked as a duplicate of this bug. ***

Git commit 3aea311f7bdfa1cdf8c36fb2ceecf7eb2534e815 by Milian Wolff.
Committed on 07/08/2012 at 11:28.
Pushed by mwolff into branch '1.4'.

When a job gets deleted, ensure we update the runcontroller.

This can happen when a job gets deleted, i.e. via QObject inheritance.
Then apparently it does *not* emit finished() and thus we could end up
with invalid pointers in the RunController leading to strange crashes
in e.g. dynamic_cast.

M  +10   -0    shell/runcontroller.cpp
M  +1    -2    shell/runcontroller.h

http://commits.kde.org/kdevplatform/3aea311f7bdfa1cdf8c36fb2ceecf7eb2534e815

*** Bug 304630 has been marked as a duplicate of this bug. ***

*** Bug 268825 has been marked as a duplicate of this bug. ***

*** Bug 316101 has been marked as a duplicate of this bug. ***

Doesn't seem to be fixed. This is from my duplicate bug report:

I re-configured my project (CMake) and kdevelop crashed with the following backtrace: Application: KDevelop (kdevelop), signal: Segmentation fault Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". [Current thread is 1 (Thread 0x7fbe2de517c0 (LWP 4115))] Thread 17 (Thread 0x7fbe1004c700 (LWP 4189)): #0 pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238 #1 0x00007fbe2bba30a7 in wait (time=1000, this=0x2a21970) at thread/qwaitcondition_unix.cpp:84 #2 QWaitCondition::wait (this=<optimized out>, mutex=0x2a21810, time=1000) at thread/qwaitcondition_unix.cpp:158 #3 0x00007fbe27a6be4b in KDevelop::DUChainPrivate::CleanupThread::run (this=0x2a217f0) at /home/stone/build/kdevplatform/language/duchain/duchain.cpp:282 #4 0x00007fbe2bba2bec in QThreadPrivate::start (arg=0x2a217f0) at thread/qthread_unix.cpp:338 #5 0x00007fbe29996f8e in start_thread (arg=0x7fbe1004c700) at pthread_create.c:311 #6 0x00007fbe2a8a8e1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113 Thread 16 (Thread 0x7fbdfebaf700 (LWP 4369)): #0 0x00007fff7b3fe8d2 in ?? () #1 0x0000000000000000 in ?? () Thread 15 (Thread 0x7fbdf48d0700 (LWP 4437)): #0 0x00007fff7b3fe8d2 in ?? () #1 0x0000000000000000 in ?? () Thread 14 (Thread 0x7fbdef598700 (LWP 4439)): #0 0x00007fff7b3fe8d2 in ?? () #1 0x0000000000000000 in ?? () Thread 13 (Thread 0x7fbdeed97700 (LWP 4440)): #0 0x00007fbe2a89c3cd in poll () at ../sysdeps/unix/syscall-template.S:81 #1 0x00007fbe24c6115c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #2 0x00007fbe24c61284 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #3 0x00007fbe2bcce026 in QEventDispatcherGlib::processEvents (this=0x7fbddc0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426 #4 0x00007fbe2bc9e37f in QEventLoop::processEvents (this=this@entry=0x7fbdeed96dc0, flags=...) at kernel/qeventloop.cpp:149 #5 0x00007fbe2bc9e608 in QEventLoop::exec (this=0x7fbdeed96dc0, flags=...) at kernel/qeventloop.cpp:204 #6 0x00007fbe2bba0410 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:542 #7 0x00007fbe2bba2bec in QThreadPrivate::start (arg=0x43c18e0) at thread/qthread_unix.cpp:338 #8 0x00007fbe29996f8e in start_thread (arg=0x7fbdeed97700) at pthread_create.c:311 #9 0x00007fbe2a8a8e1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113 Thread 12 (Thread 0x7fbdedd20700 (LWP 4461)): #0 pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185 #1 0x00007fbe26dd0e77 in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x7fbe270de660 <QTWTF::pageheap_memory>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359 #2 0x00007fbe26dd0ea9 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=<optimized out>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464 #3 0x00007fbe29996f8e in start_thread (arg=0x7fbdedd20700) at pthread_create.c:311 #4 0x00007fbe2a8a8e1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113 Thread 11 (Thread 0x7fbde3bef700 (LWP 4592)): #0 0x00007fbe2a89c3cd in poll () at ../sysdeps/unix/syscall-template.S:81 #1 0x00007fbe24c6115c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #2 0x00007fbe24c61284 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #3 0x00007fbe2bcce026 in QEventDispatcherGlib::processEvents (this=0x7fbdd80008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426 #4 0x00007fbe2bc9e37f in QEventLoop::processEvents (this=this@entry=0x7fbde3beed90, flags=...) at kernel/qeventloop.cpp:149 #5 0x00007fbe2bc9e608 in QEventLoop::exec (this=0x7fbde3beed90, flags=...) at kernel/qeventloop.cpp:204 #6 0x00007fbe2bba0410 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:542 #7 0x00007fbe2bc7fecf in QInotifyFileSystemWatcherEngine::run (this=0x6b28690) at io/qfilesystemwatcher_inotify.cpp:256 #8 0x00007fbe2bba2bec in QThreadPrivate::start (arg=0x6b28690) at thread/qthread_unix.cpp:338 #9 0x00007fbe29996f8e in start_thread (arg=0x7fbde3bef700) at pthread_create.c:311 #10 0x00007fbe2a8a8e1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113 Thread 10 (Thread 0x7fbdcffff700 (LWP 4890)): #0 pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185 #1 0x00007fbe218291e5 in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4 #2 0x00007fbe21829239 in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4 #3 0x00007fbe29996f8e in start_thread (arg=0x7fbdcffff700) at pthread_create.c:311 #4 0x00007fbe2a8a8e1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113 Thread 9 (Thread 0x7fbdcf7fe700 (LWP 4892)): #0 pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185 #1 0x00007fbe2156fea9 in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4 #2 0x00007fbe2185798e in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4 #3 0x00007fbe29996f8e in start_thread (arg=0x7fbdcf7fe700) at pthread_create.c:311 #4 0x00007fbe2a8a8e1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113 Thread 8 (Thread 0x7fbde14ee700 (LWP 4893)): #0 0x00007fbe2a89c3cd in poll () at ../sysdeps/unix/syscall-template.S:81 #1 0x00007fbe24c6115c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #2 0x00007fbe24c61284 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #3 0x00007fbe2bcce026 in QEventDispatcherGlib::processEvents (this=0x7fbdd05257b0, flags=...) at kernel/qeventdispatcher_glib.cpp:426 #4 0x00007fbe2bc9e37f in QEventLoop::processEvents (this=this@entry=0x7fbde14eddc0, flags=...) at kernel/qeventloop.cpp:149 #5 0x00007fbe2bc9e608 in QEventLoop::exec (this=0x7fbde14eddc0, flags=...) at kernel/qeventloop.cpp:204 #6 0x00007fbe2bba0410 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:542 #7 0x00007fbe2bba2bec in QThreadPrivate::start (arg=0x6c01d70) at thread/qthread_unix.cpp:338 #8 0x00007fbe29996f8e in start_thread (arg=0x7fbde14ee700) at pthread_create.c:311 #9 0x00007fbe2a8a8e1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113 Thread 7 (Thread 0x7fbde1cef700 (LWP 4904)): #0 0x00007fff7b3fe8d2 in ?? () #1 0x00007fbdd4003020 in ?? () #2 0x00000000c8001550 in ?? () #3 0x00007fbdc806a530 in ?? () #4 0x00007fbde1ceeb80 in ?? () #5 0x00007fbde1ceec38 in ?? () #6 0x0000000000000000 in ?? () Thread 6 (Thread 0x7fbdcdfbf700 (LWP 4913)): #0 0x00007fff7b3fe8d2 in ?? () #1 0x0000000000000000 in ?? () Thread 5 (Thread 0x7fbdcc9e2700 (LWP 5218)): #0 pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185 #1 0x00007fbe2bba314b in wait (time=18446744073709551615, this=0x19ad8a0) at thread/qwaitcondition_unix.cpp:86 #2 QWaitCondition::wait (this=<optimized out>, mutex=0x19f39a0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:158 #3 0x00007fbe2253f041 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x19f3740, th=0xa777d70) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365 #4 0x00007fbe2254194b in ThreadWeaver::WorkingHardState::applyForWork (this=0x19d5c70, th=0xa777d70) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71 #5 0x00007fbe22541964 in ThreadWeaver::WorkingHardState::applyForWork (this=0x19d5c70, th=0xa777d70) at ../../../threadweaver/Weaver/WorkingHardState.cpp:74 #6 0x00007fbe2254063f in ThreadWeaver::ThreadRunHelper::run (this=this@entry=0x7fbdcc9e1dc0, parent=0x19f3740, th=th@entry=0xa777d70) at ../../../threadweaver/Weaver/Thread.cpp:87 #7 0x00007fbe225406cb in ThreadWeaver::Thread::run (this=0xa777d70) at ../../../threadweaver/Weaver/Thread.cpp:142 #8 0x00007fbe2bba2bec in QThreadPrivate::start (arg=0xa777d70) at thread/qthread_unix.cpp:338 #9 0x00007fbe29996f8e in start_thread (arg=0x7fbdcc9e2700) at pthread_create.c:311 #10 0x00007fbe2a8a8e1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113 Thread 4 (Thread 0x7fbd7fffd700 (LWP 5219)): #0 pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185 #1 0x00007fbe2bba314b in wait (time=18446744073709551615, this=0x19ad8a0) at thread/qwaitcondition_unix.cpp:86 #2 QWaitCondition::wait (this=<optimized out>, mutex=0x19f39a0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:158 #3 0x00007fbe2253f041 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x19f3740, th=0x7fbd70002e50) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365 #4 0x00007fbe2254194b in ThreadWeaver::WorkingHardState::applyForWork (this=0x19d5c70, th=0x7fbd70002e50) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71 #5 0x00007fbe2254063f in ThreadWeaver::ThreadRunHelper::run (this=this@entry=0x7fbd7fffcdc0, parent=0x19f3740, th=th@entry=0x7fbd70002e50) at ../../../threadweaver/Weaver/Thread.cpp:87 #6 0x00007fbe225406cb in ThreadWeaver::Thread::run (this=0x7fbd70002e50) at ../../../threadweaver/Weaver/Thread.cpp:142 #7 0x00007fbe2bba2bec in QThreadPrivate::start (arg=0x7fbd70002e50) at thread/qthread_unix.cpp:338 #8 0x00007fbe29996f8e in start_thread (arg=0x7fbd7fffd700) at pthread_create.c:311 #9 0x00007fbe2a8a8e1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113 Thread 3 (Thread 0x7fbdcd7be700 (LWP 5507)): #0 0x00007fff7b3fe8d2 in ?? () #1 0x00007fbe24f12078 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #2 0x0000000000000000 in ?? () Thread 2 (Thread 0x7fbdce7c0700 (LWP 5508)): #0 pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238 #1 0x00007fbe2bba30a7 in wait (time=30000, this=0xa478cf0) at thread/qwaitcondition_unix.cpp:84 #2 QWaitCondition::wait (this=<optimized out>, mutex=0xa46ec08, time=30000) at thread/qwaitcondition_unix.cpp:158 #3 0x00007fbe2bb9664f in QThreadPoolThread::run (this=0xa48ef50) at concurrent/qthreadpool.cpp:141 #4 0x00007fbe2bba2bec in QThreadPrivate::start (arg=0xa48ef50) at thread/qthread_unix.cpp:338 #5 0x00007fbe29996f8e in start_thread (arg=0x7fbdce7c0700) at pthread_create.c:311 #6 0x00007fbe2a8a8e1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113 Thread 1 (Thread 0x7fbe2de517c0 (LWP 4115)): [KCrash Handler] #6 0x00007fbe28061b54 in KDevelop::ProjectBaseItem::project (this=0xa46b080) at /home/stone/build/kdevplatform/project/projectmodel.cpp:412 #7 0x00007fbde27663fa in MakeBuilder::runMake (this=0x7313630, item=0xb11d9a0, c=c@entry=MakeJob::BuildCommand, overrideTargets=..., variables=...) at /home/stone/build/kdevelop/projectbuilders/makebuilder/makebuilder.cpp:131 #8 0x00007fbde27665f0 in MakeBuilder::build (this=<optimized out>, dom=<optimized out>) at /home/stone/build/kdevelop/projectbuilders/makebuilder/makebuilder.cpp:53 #9 0x00007fbde2559a24 in CMakeBuilder::build (this=0x6d0cc60, dom=<optimized out>) at /home/stone/build/kdevelop/projectbuilders/cmakebuilder/cmakebuilder.cpp:135 #10 0x00007fbe2806aa9b in KDevelop::BuilderJobPrivate::addJob (this=0x9d576c0, t=t@entry=KDevelop::BuilderJob::Build, item=0xb11d9a0) at /home/stone/build/kdevplatform/project/builderjob.cpp:123 #11 0x00007fbe2806b0ee in KDevelop::BuilderJob::addItems (this=0xb10ac90, t=KDevelop::BuilderJob::Build, items=...) at /home/stone/build/kdevplatform/project/builderjob.cpp:164 #12 0x00007fbdf711b07a in ProjectManagerViewPlugin::runBuilderJob (this=this@entry=0x3edf480, type=type@entry=KDevelop::BuilderJob::Build, items=...) at /home/stone/build/kdevplatform/plugins/projectmanagerview/projectmanagerviewplugin.cpp:389 #13 0x00007fbdf711c2b0 in ProjectManagerViewPlugin::buildProjectItems (this=0x3edf480) at /home/stone/build/kdevplatform/plugins/projectmanagerview/projectmanagerviewplugin.cpp:416 #14 0x00007fbe2bcb40df in QMetaObject::activate (sender=0x388ce20, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fff7b3814c0) at kernel/qobject.cpp:3539 #15 0x00007fbe2b03f152 in QAction::triggered (this=this@entry=0x388ce20, _t1=false) at .moc/release-shared/moc_qaction.cpp:277 #16 0x00007fbe2b040580 in QAction::activate (this=0x388ce20, event=<optimized out>) at kernel/qaction.cpp:1257 #17 0x00007fbe2b404a9f in QAbstractButtonPrivate::click (this=this@entry=0x3ee3a90) at widgets/qabstractbutton.cpp:530 #18 0x00007fbe2b404d4c in QAbstractButton::mouseReleaseEvent (this=0x3eea810, e=0x7fff7b381d70) at widgets/qabstractbutton.cpp:1123 #19 0x00007fbe2b4c182a in QToolButton::mouseReleaseEvent (this=<optimized out>, e=<optimized out>) at widgets/qtoolbutton.cpp:718 #20 0x00007fbe2b092a89 in QWidget::event (this=0x3eea810, event=0x7fff7b381d70) at kernel/qwidget.cpp:8375 #21 0x00007fbe2b0458ec in QApplicationPrivate::notify_helper (this=this@entry=0x1704a00, receiver=receiver@entry=0x3eea810, e=e@entry=0x7fff7b381d70) at kernel/qapplication.cpp:4567 #22 0x00007fbe2b048a33 in QApplication::notify (this=<optimized out>, receiver=0x3eea810, e=0x7fff7b381d70) at kernel/qapplication.cpp:4110 #23 0x00007fbe2c229666 in KApplication::notify (this=0x7fff7b382ca0, receiver=0x3eea810, event=0x7fff7b381d70) at ../../kdeui/kernel/kapplication.cpp:311 #24 0x00007fbe2bc9f62e in QCoreApplication::notifyInternal (this=0x7fff7b382ca0, receiver=0x3eea810, event=0x7fff7b381d70) at kernel/qcoreapplication.cpp:946 #25 0x00007fbe2b04b933 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231 #26 QApplicationPrivate::sendMouseEvent (receiver=0x3eea810, event=0x7fff7b381d70, alienWidget=0x3eea810, nativeWidget=0x1bcc8d0, buttonDown=0x7fbe2bb23308 <qt_button_down>, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:3178 #27 0x00007fbe2b0c0ec4 in QETWidget::translateMouseEvent (this=this@entry=0x1bcc8d0, event=event@entry=0x7fff7b3824f0) at kernel/qapplication_x11.cpp:4631 #28 0x00007fbe2b0bfef1 in QApplication::x11ProcessEvent (this=0x7fff7b382ca0, event=0x7fff7b3824f0) at kernel/qapplication_x11.cpp:3746 #29 0x00007fbe2b0eb0b2 in x11EventSourceDispatch (s=0x1706270, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146 #30 0x00007fbe24c60e85 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #31 0x00007fbe24c611c8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #32 0x00007fbe24c61284 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #33 0x00007fbe2bcce006 in QEventDispatcherGlib::processEvents (this=0x1644ad0, flags=...) at kernel/qeventdispatcher_glib.cpp:424 #34 0x00007fbe2b0eb1ae in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204 #35 0x00007fbe2bc9e37f in QEventLoop::processEvents (this=this@entry=0x7fff7b3828c0, flags=...) at kernel/qeventloop.cpp:149 #36 0x00007fbe2bc9e608 in QEventLoop::exec (this=0x7fff7b3828c0, flags=...) at kernel/qeventloop.cpp:204 #37 0x00007fbe2bca3ce6 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1218 #38 0x000000000040da9a in main (argc=<optimized out>, argv=<optimized out>) at /home/stone/build/kdevelop/app/main.cpp:506 I have Qt 4.8.4. Reproducible: Sometimes

Reopening. Andre, the backtrace you posted was badly formatted.

Reposting it here for reference:
Thread 1 (Thread 0x7fbe2de517c0 (LWP 4115)):
[KCrash Handler]
#6  0x00007fbe28061b54 in KDevelop::ProjectBaseItem::project (this=0xa46b080) at /home/stone/build/kdevplatform/project/projectmodel.cpp:412
#7  0x00007fbde27663fa in MakeBuilder::runMake (this=0x7313630, item=0xb11d9a0, c=c@entry=MakeJob::BuildCommand, overrideTargets=..., variables=...) at /home/stone/build/kdevelop/projectbuilders/makebuilder/makebuilder.cpp:131
#8  0x00007fbde27665f0 in MakeBuilder::build (this=<optimized out>, dom=<optimized out>) at /home/stone/build/kdevelop/projectbuilders/makebuilder/makebuilder.cpp:53
#9  0x00007fbde2559a24 in CMakeBuilder::build (this=0x6d0cc60, dom=<optimized out>) at /home/stone/build/kdevelop/projectbuilders/cmakebuilder/cmakebuilder.cpp:135
#10 0x00007fbe2806aa9b in KDevelop::BuilderJobPrivate::addJob (this=0x9d576c0, t=t@entry=KDevelop::BuilderJob::Build, item=0xb11d9a0) at /home/stone/build/kdevplatform/project/builderjob.cpp:123
#11 0x00007fbe2806b0ee in KDevelop::BuilderJob::addItems (this=0xb10ac90, t=KDevelop::BuilderJob::Build, items=...) at /home/stone/build/kdevplatform/project/builderjob.cpp:164
#12 0x00007fbdf711b07a in ProjectManagerViewPlugin::runBuilderJob (this=this@entry=0x3edf480, type=type@entry=KDevelop::BuilderJob::Build, items=...) at /home/stone/build/kdevplatform/plugins/projectmanagerview/projectmanagerviewplugin.cpp:389
#13 0x00007fbdf711c2b0 in ProjectManagerViewPlugin::buildProjectItems (this=0x3edf480) at /home/stone/build/kdevplatform/plugins/projectmanagerview/projectmanagerviewplugin.cpp:416
#14 0x00007fbe2bcb40df in QMetaObject::activate (sender=0x388ce20, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fff7b3814c0) at kernel/qobject.cpp:3539
#15 0x00007fbe2b03f152 in QAction::triggered (this=this@entry=0x388ce20, _t1=false) at .moc/release-shared/moc_qaction.cpp:277
#16 0x00007fbe2b040580 in QAction::activate (this=0x388ce20, event=<optimized out>) at kernel/qaction.cpp:1257
#17 0x00007fbe2b404a9f in QAbstractButtonPrivate::click (this=this@entry=0x3ee3a90) at widgets/qabstractbutton.cpp:530
#18 0x00007fbe2b404d4c in QAbstractButton::mouseReleaseEvent (this=0x3eea810, e=0x7fff7b381d70) at widgets/qabstractbutton.cpp:1123
#19 0x00007fbe2b4c182a in QToolButton::mouseReleaseEvent (this=<optimized out>, e=<optimized out>) at widgets/qtoolbutton.cpp:718
#20 0x00007fbe2b092a89 in QWidget::event (this=0x3eea810, event=0x7fff7b381d70) at kernel/qwidget.cpp:8375
#21 0x00007fbe2b0458ec in QApplicationPrivate::notify_helper (this=this@entry=0x1704a00, receiver=receiver@entry=0x3eea810, e=e@entry=0x7fff7b381d70) at kernel/qapplication.cpp:4567
#22 0x00007fbe2b048a33 in QApplication::notify (this=<optimized out>, receiver=0x3eea810, e=0x7fff7b381d70) at kernel/qapplication.cpp:4110
#23 0x00007fbe2c229666 in KApplication::notify (this=0x7fff7b382ca0, receiver=0x3eea810, event=0x7fff7b381d70) at ../../kdeui/kernel/kapplication.cpp:311
#24 0x00007fbe2bc9f62e in QCoreApplication::notifyInternal (this=0x7fff7b382ca0, receiver=0x3eea810, event=0x7fff7b381d70) at kernel/qcoreapplication.cpp:946
#25 0x00007fbe2b04b933 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#26 QApplicationPrivate::sendMouseEvent (receiver=0x3eea810, event=0x7fff7b381d70, alienWidget=0x3eea810, nativeWidget=0x1bcc8d0, buttonDown=0x7fbe2bb23308 <qt_button_down>, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:3178
#27 0x00007fbe2b0c0ec4 in QETWidget::translateMouseEvent (this=this@entry=0x1bcc8d0, event=event@entry=0x7fff7b3824f0) at kernel/qapplication_x11.cpp:4631
#28 0x00007fbe2b0bfef1 in QApplication::x11ProcessEvent (this=0x7fff7b382ca0, event=0x7fff7b3824f0) at kernel/qapplication_x11.cpp:3746
#29 0x00007fbe2b0eb0b2 in x11EventSourceDispatch (s=0x1706270, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#30 0x00007fbe24c60e85 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#31 0x00007fbe24c611c8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#32 0x00007fbe24c61284 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#33 0x00007fbe2bcce006 in QEventDispatcherGlib::processEvents (this=0x1644ad0, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#34 0x00007fbe2b0eb1ae in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#35 0x00007fbe2bc9e37f in QEventLoop::processEvents (this=this@entry=0x7fff7b3828c0, flags=...) at kernel/qeventloop.cpp:149
#36 0x00007fbe2bc9e608 in QEventLoop::exec (this=0x7fff7b3828c0, flags=...) at kernel/qeventloop.cpp:204
#37 0x00007fbe2bca3ce6 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1218
#38 0x000000000040da9a in main (argc=<optimized out>, argv=<optimized out>) at /home/stone/build/kdevelop/app/main.cpp:506

*** Bug 317429 has been marked as a duplicate of this bug. ***

André, can you try to run it with valgrind too? is it happening any often for you?

Assuming this got fixed in 5.0 -- reopen if not.

*** Bug 381801 has been marked as a duplicate of this bug. ***