Application: kate (3.8.0)
KDE Platform Version: 4.8.00 (4.8.0
Qt Version: 4.7.4
Operating System: Linux 3.0.0-15-generic x86_64
Distribution: Ubuntu 11.10

-- Information about the crash:
Sometimes (though not always), Kate will crash when erasing the beginning of a C-style comment.

Example:
start with the following code in a c source file:
/* this is a comment */

Place the cursor after 'comment' (but before the end of the comment itself) and hold backspace until it looks as follows:

/  */

Kate often (but not always) crashes in this state (if C highlighting is on).

The crash can be reproduced some of the time.

-- Backtrace:
Application: Kate (kate), signal: Segmentation fault
[Current thread is 1 (Thread 0x7fd96829e780 (LWP 1539))]

Thread 4 (Thread 0x7fd953cb4700 (LWP 1540)):
#0  __libc_enable_asynccancel () at ../nptl/sysdeps/unix/sysv/linux/x86_64/cancellation.S:66
#1  0x00007fd967bfd758 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:85
#2  0x00007fd964d56f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd964d57429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fd965b12f3e in QEventDispatcherGlib::processEvents (this=0x2ab0580, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#5  0x00007fd965ae6cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007fd965ae6ef7 in QEventLoop::exec (this=0x7fd953cb3dd0, flags=...) at kernel/qeventloop.cpp:201
#7  0x00007fd9659fe27f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#8  0x00007fd965ac9cbf in QInotifyFileSystemWatcherEngine::run (this=0x2aaf9e0) at io/qfilesystemwatcher_inotify.cpp:248
#9  0x00007fd965a00d05 in QThreadPrivate::start (arg=0x2aaf9e0) at thread/qthread_unix.cpp:331
#10 0x00007fd965228efc in start_thread (arg=0x7fd953cb4700) at pthread_create.c:304
#11 0x00007fd967c0989d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7fd95334f700 (LWP 1541)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007fd956da6fe2 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007fd956da7019 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007fd965228efc in start_thread (arg=0x7fd95334f700) at pthread_create.c:304
#4  0x00007fd967c0989d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fd95150c700 (LWP 1542)):
#0  0x00007fd967bfd773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fd964d56f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd964d57429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd965b12f3e in QEventDispatcherGlib::processEvents (this=0x7fd94c000910, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007fd965ae6cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fd965ae6ef7 in QEventLoop::exec (this=0x7fd95150bdd0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007fd9659fe27f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007fd965ac9cbf in QInotifyFileSystemWatcherEngine::run (this=0x2f80290) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007fd965a00d05 in QThreadPrivate::start (arg=0x2f80290) at thread/qthread_unix.cpp:331
#9  0x00007fd965228efc in start_thread (arg=0x7fd95150c700) at pthread_create.c:304
#10 0x00007fd967c0989d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fd96829e780 (LWP 1539)):
[KCrash Handler]
#6  getStartMatching (endNode=0x3356c00, this=0x33b8540) at ../../part/syntax/katecodefolding.cpp:151
#7  KateCodeFoldingTree::getLineDepth (this=<optimized out>, line=<optimized out>, validEndings=<optimized out>) at ../../part/syntax/katecodefolding.cpp:945
#8  0x00007fd95745d22a in KateCodeFoldingTree::getLineDepth (this=0x27aba30, line=196) at ../../part/syntax/katecodefolding.cpp:918
#9  0x00007fd95745d282 in KateCodeFoldingTree::getLineInfo (this=0x27aba30, info=0x7fff3e23c090, line=196) at ../../part/syntax/katecodefolding.cpp:971
#10 0x00007fd95748a8ca in KateIconBorder::paintBorder (this=0x2aa3b70, y=<optimized out>, height=<optimized out>) at ../../part/view/kateviewhelpers.cpp:1194
#11 0x00007fd967094c9c in QWidget::event (this=0x2aa3b70, event=0x7fff3e23c800) at kernel/qwidget.cpp:8441
#12 0x00007fd967044474 in notify_helper (e=0x7fff3e23c800, receiver=0x2aa3b70, this=0x24982a0) at kernel/qapplication.cpp:4486
#13 QApplicationPrivate::notify_helper (this=0x24982a0, receiver=0x2aa3b70, e=0x7fff3e23c800) at kernel/qapplication.cpp:4458
#14 0x00007fd9670492e1 in QApplication::notify (this=0x7fff3e240b40, receiver=0x2aa3b70, e=0x7fff3e23c800) at kernel/qapplication.cpp:4365
#15 0x00007fd9662c6ae6 in KApplication::notify (this=0x7fff3e240b40, receiver=0x2aa3b70, event=0x7fff3e23c800) at ../../kdeui/kernel/kapplication.cpp:311
#16 0x00007fd965ae7afc in QCoreApplication::notifyInternal (this=0x7fff3e240b40, receiver=0x2aa3b70, event=0x7fff3e23c800) at kernel/qcoreapplication.cpp:787
#17 0x00007fd967091bd4 in sendSpontaneousEvent (event=0x7fff3e23c800, receiver=0x2aa3b70) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#18 QWidgetPrivate::drawWidget (this=0x2aa3c50, pdev=0x2c46b80, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5528
#19 0x00007fd9670927b0 in QWidgetPrivate::paintSiblingsRecursive (this=0x2d13330, pdev=0x2c46b80, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5735
#20 0x00007fd967092690 in QWidgetPrivate::paintSiblingsRecursive (this=0x2d13330, pdev=0x2c46b80, siblings=..., index=1, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5722
#21 0x00007fd967092690 in QWidgetPrivate::paintSiblingsRecursive (this=0x2d13330, pdev=0x2c46b80, siblings=..., index=2, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5722
#22 0x00007fd967092690 in QWidgetPrivate::paintSiblingsRecursive (this=0x2d13330, pdev=0x2c46b80, siblings=..., index=3, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5722
#23 0x00007fd967092690 in QWidgetPrivate::paintSiblingsRecursive (this=0x2d13330, pdev=0x2c46b80, siblings=..., index=4, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5722
#24 0x00007fd967092690 in QWidgetPrivate::paintSiblingsRecursive (this=0x2d13330, pdev=0x2c46b80, siblings=..., index=5, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5722
#25 0x00007fd96709192c in QWidgetPrivate::drawWidget (this=0x2d13330, pdev=0x2c46b80, rgn=..., offset=..., flags=<optimized out>, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5581
#26 0x00007fd9670927b0 in QWidgetPrivate::paintSiblingsRecursive (this=0x2cecb50, pdev=0x2c46b80, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5735
#27 0x00007fd96709192c in QWidgetPrivate::drawWidget (this=0x2cecb50, pdev=0x2c46b80, rgn=..., offset=..., flags=<optimized out>, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5581
#28 0x00007fd9670927b0 in QWidgetPrivate::paintSiblingsRecursive (this=0x2832600, pdev=0x2c46b80, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5735
#29 0x00007fd96709192c in QWidgetPrivate::drawWidget (this=0x2832600, pdev=0x2c46b80, rgn=..., offset=..., flags=<optimized out>, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5581
#30 0x00007fd9670927b0 in QWidgetPrivate::paintSiblingsRecursive (this=0x2832130, pdev=0x2c46b80, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5735
#31 0x00007fd967092690 in QWidgetPrivate::paintSiblingsRecursive (this=0x2832130, pdev=0x2c46b80, siblings=..., index=1, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5722
#32 0x00007fd96709192c in QWidgetPrivate::drawWidget (this=0x2832130, pdev=0x2c46b80, rgn=..., offset=..., flags=<optimized out>, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5581
#33 0x00007fd9670927b0 in QWidgetPrivate::paintSiblingsRecursive (this=0x282aa10, pdev=0x2c46b80, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5735
#34 0x00007fd96709192c in QWidgetPrivate::drawWidget (this=0x282aa10, pdev=0x2c46b80, rgn=..., offset=..., flags=<optimized out>, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5581
#35 0x00007fd9670927b0 in QWidgetPrivate::paintSiblingsRecursive (this=0x281ba80, pdev=0x2c46b80, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5735
#36 0x00007fd96709192c in QWidgetPrivate::drawWidget (this=0x281ba80, pdev=0x2c46b80, rgn=..., offset=..., flags=<optimized out>, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5581
#37 0x00007fd9670927b0 in QWidgetPrivate::paintSiblingsRecursive (this=0x281ad50, pdev=0x2c46b80, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5735
#38 0x00007fd96709192c in QWidgetPrivate::drawWidget (this=0x281ad50, pdev=0x2c46b80, rgn=..., offset=..., flags=<optimized out>, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5581
#39 0x00007fd9670927b0 in QWidgetPrivate::paintSiblingsRecursive (this=0x2819840, pdev=0x2c46b80, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5735
#40 0x00007fd96709192c in QWidgetPrivate::drawWidget (this=0x2819840, pdev=0x2c46b80, rgn=..., offset=..., flags=<optimized out>, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5581
#41 0x00007fd9670927b0 in QWidgetPrivate::paintSiblingsRecursive (this=0x2818ed0, pdev=0x2c46b80, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5735
#42 0x00007fd96709192c in QWidgetPrivate::drawWidget (this=0x2818ed0, pdev=0x2c46b80, rgn=..., offset=..., flags=<optimized out>, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5581
#43 0x00007fd9670927b0 in QWidgetPrivate::paintSiblingsRecursive (this=0x2817ca0, pdev=0x2c46b80, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5735
#44 0x00007fd96709192c in QWidgetPrivate::drawWidget (this=0x2817ca0, pdev=0x2c46b80, rgn=..., offset=..., flags=<optimized out>, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5581
#45 0x00007fd9670927b0 in QWidgetPrivate::paintSiblingsRecursive (this=0x280fdc0, pdev=0x2c46b80, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5735
#46 0x00007fd96709192c in QWidgetPrivate::drawWidget (this=0x280fdc0, pdev=0x2c46b80, rgn=..., offset=..., flags=<optimized out>, sharedPainter=0x0, backingStore=0x2654ea0) at kernel/qwidget.cpp:5581
#47 0x00007fd967255273 in QWidgetBackingStore::sync (this=0x2654ea0) at painting/qbackingstore.cpp:1338
#48 0x00007fd9670883b0 in QWidgetPrivate::syncBackingStore (this=0x280fdc0) at kernel/qwidget.cpp:1862
#49 0x00007fd9670951ac in QWidget::event (this=0x280fc50, event=0x2e3dad0) at kernel/qwidget.cpp:8588
#50 0x00007fd967456dab in QMainWindow::event (this=0x280fc50, event=0x2e3dad0) at widgets/qmainwindow.cpp:1478
#51 0x00007fd9663c2de8 in KXmlGuiWindow::event (this=0x280fc50, ev=0x2e3dad0) at ../../kdeui/xmlgui/kxmlguiwindow.cpp:126
#52 0x00007fd967044474 in notify_helper (e=0x2e3dad0, receiver=0x280fc50, this=0x24982a0) at kernel/qapplication.cpp:4486
#53 QApplicationPrivate::notify_helper (this=0x24982a0, receiver=0x280fc50, e=0x2e3dad0) at kernel/qapplication.cpp:4458
#54 0x00007fd9670492e1 in QApplication::notify (this=0x7fff3e240b40, receiver=0x280fc50, e=0x2e3dad0) at kernel/qapplication.cpp:4365
#55 0x00007fd9662c6ae6 in KApplication::notify (this=0x7fff3e240b40, receiver=0x280fc50, event=0x2e3dad0) at ../../kdeui/kernel/kapplication.cpp:311
#56 0x00007fd965ae7afc in QCoreApplication::notifyInternal (this=0x7fff3e240b40, receiver=0x280fc50, event=0x2e3dad0) at kernel/qcoreapplication.cpp:787
#57 0x00007fd965aeb51f in sendEvent (event=0x2e3dad0, receiver=0x280fc50) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#58 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x24638b0) at kernel/qcoreapplication.cpp:1428
#59 0x00007fd965b12a73 in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220
#60 postEventSourceDispatch (s=<optimized out>) at kernel/qeventdispatcher_glib.cpp:277
#61 0x00007fd964d56a5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#62 0x00007fd964d57258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#63 0x00007fd964d57429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#64 0x00007fd965b12ed6 in QEventDispatcherGlib::processEvents (this=0x2497e70, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#65 0x00007fd9670ec10e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#66 0x00007fd965ae6cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#67 0x00007fd965ae6ef7 in QEventLoop::exec (this=0x7fff3e240a80, flags=...) at kernel/qeventloop.cpp:201
#68 0x00007fd965aeb789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#69 0x00007fd967ecd0d5 in kdemain (argc=<optimized out>, argv=<optimized out>) at ../../../kate/app/katemain.cpp:377
#70 0x00007fd967b4930d in __libc_start_main (main=0x400630 <main(int, char**)>, argc=2, ubp_av=0x7fff3e242078, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff3e242068) at libc-start.c:226
#71 0x0000000000400661 in _start ()

Reported using DrKonqi