Application: kwin_x11 (5.3.0)

Qt Version: 5.4.1
Operating System: Linux 3.19.0-15-generic x86_64
Distribution: Ubuntu 15.04

-- Information about the crash:
Error occured when I was changing, my monitor setup in KDE settings. I chaged position of external monitor (from left to top) and changed main monitor (from external to NTB monitor), then error occured. It usually occurs when I change configuration of my monitor setup.

The crash can be reproduced sometimes.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f49087a8800 (LWP 7922))]

Thread 3 (Thread 0x7f48ebfff700 (LWP 7929)):
#0  0x00007f4908281743 in select () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f4906873101 in qt_safe_select (nfds=14, fdread=fdread@entry=0x7f48e0000a78, fdwrite=fdwrite@entry=0x7f48e0000d08, fdexcept=fdexcept@entry=0x7f48e0000f98, orig_timeout=orig_timeout@entry=0x0) at kernel/qcore_unix.cpp:75
#2  0x00007f4906874cd2 in select (timeout=0x0, exceptfds=0x7f48e0000f98, writefds=0x7f48e0000d08, readfds=0x7f48e0000a78, nfds=<optimized out>, this=0x7f48e00008c0) at kernel/qeventdispatcher_unix.cpp:320
#3  QEventDispatcherUNIXPrivate::doSelect (this=this@entry=0x7f48e00008e0, flags=..., flags@entry=..., timeout=timeout@entry=0x0) at kernel/qeventdispatcher_unix.cpp:196
#4  0x00007f4906875275 in QEventDispatcherUNIX::processEvents (this=0x7f48e00008c0, flags=...) at kernel/qeventdispatcher_unix.cpp:607
#5  0x00007f490681c3e2 in QEventLoop::exec (this=this@entry=0x7f48ebffeda0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f49065dbb44 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f490043ef65 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f49065e0b0e in QThreadPrivate::start (arg=0x21cdb50) at thread/qthread_unix.cpp:337
#9  0x00007f4907b006aa in start_thread (arg=0x7f48ebfff700) at pthread_create.c:333
#10 0x00007f490828aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f48e9463700 (LWP 7931)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f49053e4644 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f49053e4689 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f4907b006aa in start_thread (arg=0x7f48e9463700) at pthread_create.c:333
#4  0x00007f490828aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f49087a8800 (LWP 7922)):
[KCrash Handler]
#6  gen7_update_renderbuffer_surface (brw=0x7f48f0010038, rb=0x28c6fa0, layered=<optimized out>, unit=0) at ../../../../../../../src/mesa/drivers/dri/i965/gen7_wm_surface_state.c:466
#7  0x00007f48eac0df9d in brw_update_renderbuffer_surfaces (brw=0x7f48f0010038) at ../../../../../../../src/mesa/drivers/dri/i965/brw_wm_surface_state.c:733
#8  0x00007f48eabed584 in brw_upload_state (brw=0x7f48f0010038) at ../../../../../../../src/mesa/drivers/dri/i965/brw_state_upload.c:648
#9  0x00007f48eab7cb44 in brw_try_draw_prims (indirect=<optimized out>, max_index=<optimized out>, min_index=<optimized out>, ib=<optimized out>, nr_prims=<optimized out>, prims=<optimized out>, arrays=<optimized out>, ctx=<optimized out>) at ../../../../../../../src/mesa/drivers/dri/i965/brw_draw.c:514
#10 brw_draw_prims (ctx=0x7f48f0010038, prims=0x7ffe3c1990c0, nr_prims=1, ib=0x0, index_bounds_valid=1 '\001', min_index=0, max_index=23, unused_tfb_object=0x0, indirect=0x0) at ../../../../../../../src/mesa/drivers/dri/i965/brw_draw.c:607
#11 0x00007f48ea9df07c in vbo_draw_arrays (ctx=0x7f48f0010038, mode=4, start=0, count=24, numInstances=1, baseInstance=0) at ../../../../src/mesa/vbo/vbo_exec_array.c:645
#12 0x00007f490088e371 in KWin::GLVertexBuffer::draw (this=this@entry=0x29b3c90, region=..., primitiveMode=primitiveMode@entry=4, first=first@entry=0, count=24, hardwareClipping=hardwareClipping@entry=false) at ../../libkwineffects/kwinglutils.cpp:2393
#13 0x00007f4900892189 in KWin::GLVertexBuffer::render (this=this@entry=0x29b3c90, region=..., primitiveMode=primitiveMode@entry=4, hardwareClipping=hardwareClipping@entry=false) at ../../libkwineffects/kwinglutils.cpp:2346
#14 0x00007f49008921fd in KWin::GLVertexBuffer::render (this=this@entry=0x29b3c90, primitiveMode=primitiveMode@entry=4) at ../../libkwineffects/kwinglutils.cpp:2340
#15 0x00007f4907e2efaa in KWin::SceneOpenGL2::doPaintBackground (this=<optimized out>, vertices=...) at ../scene_opengl.cpp:1054
#16 0x00007f4907e34705 in KWin::SceneOpenGL::paintBackground (this=this@entry=0x2878820, region=...) at ../scene_opengl.cpp:742
#17 0x00007f4907e1b2ac in KWin::Scene::paintSimpleScreen (this=this@entry=0x2878820, orig_mask=orig_mask@entry=0, region=...) at ../scene.cpp:371
#18 0x00007f4907e2e743 in KWin::SceneOpenGL2::paintSimpleScreen (this=this@entry=0x2878820, mask=mask@entry=0, region=...) at ../scene_opengl.cpp:1015
#19 0x00007f4907e17e15 in KWin::Scene::finalPaintScreen (this=0x2878820, mask=mask@entry=0, region=..., data=...) at ../scene.cpp:201
#20 0x00007f4907e52f1f in KWin::EffectsHandlerImpl::paintScreen (this=0x2ec2870, mask=mask@entry=0, region=..., data=...) at ../effects.cpp:397
#21 0x00007f4905dec66f in KWin::Effect::paintScreen (this=this@entry=0x3617c50, mask=mask@entry=0, region=..., data=...) at ../../libkwineffects/kwineffects.cpp:535
#22 0x00007f4907e52ecd in KWin::EffectsHandlerImpl::paintScreen (this=0x2ec2870, mask=mask@entry=0, region=..., data=...) at ../effects.cpp:394
#23 0x00007f4905dec66f in KWin::Effect::paintScreen (this=this@entry=0x21488a0, mask=mask@entry=0, region=..., data=...) at ../../libkwineffects/kwineffects.cpp:535
#24 0x00007f4907e52ecd in KWin::EffectsHandlerImpl::paintScreen (this=0x2ec2870, mask=0, region=..., data=...) at ../effects.cpp:394
#25 0x00007f4907e17a7a in KWin::Scene::paintScreen (this=this@entry=0x2878820, mask=mask@entry=0x7ffe3c19981c, damage=..., repaint=..., updateRegion=updateRegion@entry=0x7ffe3c199830, validRegion=validRegion@entry=0x7ffe3c199840) at ../scene.cpp:151
#26 0x00007f4907e35037 in KWin::SceneOpenGL::paint (this=0x2878820, damage=..., toplevels=...) at ../scene_opengl.cpp:661
#27 0x00007f4907e0ff33 in KWin::Compositor::performCompositing (this=0x2084740) at ../composite.cpp:700
#28 0x00007f49068506f3 in QObject::event (this=0x2084740, e=<optimized out>) at kernel/qobject.cpp:1267
#29 0x00007f4907128b2c in QApplicationPrivate::notify_helper (this=0x2005250, receiver=0x2084740, e=0x7ffe3c199c50) at kernel/qapplication.cpp:3720
#30 0x00007f490712e000 in QApplication::notify (this=0x7ffe3c199e90, receiver=0x2084740, e=0x7ffe3c199c50) at kernel/qapplication.cpp:3503
#31 0x00007f490681ec2b in QCoreApplication::notifyInternal (this=0x7ffe3c199e90, receiver=0x2084740, event=event@entry=0x7ffe3c199c50) at kernel/qcoreapplication.cpp:935
#32 0x00007f4906876ae5 in sendEvent (event=0x7ffe3c199c50, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#33 QTimerInfoList::activateTimers (this=0x2032438) at kernel/qtimerinfo_unix.cpp:635
#34 0x00007f49068746a0 in QEventDispatcherUNIX::activateTimers (this=this@entry=0x2031760) at kernel/qeventdispatcher_unix.cpp:549
#35 0x00007f4906875243 in QEventDispatcherUNIX::processEvents (this=0x2031760, flags=flags@entry=...) at kernel/qeventdispatcher_unix.cpp:611
#36 0x00007f48f277596d in QUnixEventDispatcherQPA::processEvents (this=<optimized out>, flags=...) at eventdispatchers/qunixeventdispatcher.cpp:62
#37 0x00007f490681c3e2 in QEventLoop::exec (this=this@entry=0x7ffe3c199db0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#38 0x00007f490682402c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#39 0x00007f4906b6331c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1510
#40 0x00007f49071247a5 in QApplication::exec () at kernel/qapplication.cpp:2956
#41 0x00007f4908553310 in kdemain (argc=2, argv=0x7ffe3c199ff8) at ../main_x11.cpp:300
#42 0x00007f49081a4a40 in __libc_start_main (main=0x400790 <main(int, char**)>, argc=2, argv=0x7ffe3c199ff8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffe3c199fe8) at libc-start.c:289
#43 0x00000000004007c9 in _start ()

Reported using DrKonqi