Version:            (using KDE 4.2.3)
OS:                Linux
Installed from:    Ubuntu Packages

Reproducible 90% of times as follows

- Open a project

- From the toolbar, click to viewpdf

- close the pdf viewer (okular in my case)

- close kile

then it crashes with the following backtrace:

Application: Kile (kile), signal SIGSEGV
0x00007f7c63bc0d21 in nanosleep () from /lib/libc.so.6
[Current thread is 0 (LWP 19486)]

Thread 2 (Thread 0x7f7c56d37950 (LWP 19490)):
#0  0x00007f7c63bf7742 in select () from /lib/libc.so.6
#1  0x00007f7c64768f06 in QProcessManager::run (this=0xde0080) at io/qprocess_unix.cpp:305
#2  0x00007f7c646a1952 in QThreadPrivate::start (arg=0xde0080) at thread/qthread_unix.cpp:189
#3  0x00007f7c615b13ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#4  0x00007f7c63bfefcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f7c68a54750 (LWP 19486)):
[KCrash Handler]
#5  0x00007f7c65533980 in ~QX11WindowSurface (this=0x1d0faa0) at painting/qwindowsurface_x11.cpp:84
#6  0x00007f7c6552d058 in ~QWidgetBackingStore (this=0x1d769b0) at painting/qbackingstore.cpp:828
#7  0x00007f7c6537a5d5 in QWidgetPrivate::deleteExtra (this=0x1562680) at kernel/qwidget.cpp:1503
#8  0x00007f7c6537ad6d in ~QWidgetPrivate (this=0x1562680) at kernel/qwidget.cpp:224
#9  0x00007f7c657670a3 in ~QMenuPrivate (this=0x1562680) at widgets/qmenu_p.h:151
#10 0x00007f7c647a180b in ~QObject (this=0x1562640) at kernel/qobject.cpp:865
#11 0x00007f7c6537fd6f in ~QWidget (this=0x1562640) at kernel/qwidget.cpp:1386
#12 0x00007f7c6575dfd9 in ~QMenu (this=0x1562640) at widgets/qmenu.cpp:1373
#13 0x00007f7c662ce93b in ~KMenu (this=0x1562640) at /build/buildd/kde4libs-4.2.3/kdeui/widgets/kmenu.cpp:173
#14 0x00007f7c661370ca in ~KSelectAction (this=0x1560fc0) at /build/buildd/kde4libs-4.2.3/kdeui/actions/kselectaction.cpp:100
#15 0x000000000059d350 in _start ()


This is another backtrace

Application: Kile (kile), signal SIGSEGV
0x00007fc88de0cd21 in nanosleep () from /lib/libc.so.6
[Current thread is 0 (LWP 19616)]

Thread 2 (Thread 0x7fc880f83950 (LWP 19617)):
#0  0x00007fc88de43742 in select () from /lib/libc.so.6
#1  0x00007fc88e9b4f06 in QProcessManager::run (this=0x21b6080) at io/qprocess_unix.cpp:305
#2  0x00007fc88e8ed952 in QThreadPrivate::start (arg=0x21b6080) at thread/qthread_unix.cpp:189
#3  0x00007fc88b7fd3ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#4  0x00007fc88de4afcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fc892ca0750 (LWP 19616)):
[KCrash Handler]
#5  QAction::setEnabled (this=0x2854020, b=false) at kernel/qaction.cpp:1010
#6  0x000000000061f2d0 in _start ()