Bug 474839

Summary: Kwin crashes in KWin::BlurEffect::blurRegion() when moving tabs out of Firefox window and back
Product: [Plasma] kwin Reporter: Roke Julian Lockhart Beedell <4wy78uwh>
Component: generalAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED DUPLICATE    
Severity: crash CC: kde, nate, oguilherme
Priority: NOR Keywords: drkonqi
Version First Reported In: 5.27.8   
Target Milestone: ---   
Platform: openSUSE   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:
Attachments: KWin 6.0.4 crash on X11

Description Roke Julian Lockhart Beedell 2023-09-24 19:42:40 UTC 
Application: kwin_x11 (5.27.8)

Qt Version: 5.15.10
Frameworks Version: 5.110.0
Operating System: Linux 6.5.4-1-default x86_64
Windowing System: X11
Distribution: "openSUSE Tumbleweed"
DrKonqi: 5.27.8 [CoredumpBackend]

-- Information about the crash:
Kwin supposedly crashed when I moved a tab out of, and back to, a https://software.opensuse.org/package/MozillaFirefox window.

The crash does not seem to be reproducible.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault

           PID: 1954 (kwin_x11)
           UID: 1000 (RokeJulianLockhart)
           GID: 1000 (RokeJulianLockhart)
        Signal: 11 (SEGV)
     Timestamp: Sun 2023-09-24 20:30:03 BST (6min ago)
  Command Line: /usr/bin/kwin_x11 --replace
    Executable: /usr/bin/kwin_x11
 Control Group: /user.slice/user-1000.slice/user@1000.service/session.slice/plasma-kwin_x11.service
          Unit: user@1000.service
     User Unit: plasma-kwin_x11.service
         Slice: user-1000.slice
     Owner UID: 1000 (RokeJulianLockhart)
       Boot ID: c215152475c6499180bd92be9206a37c
    Machine ID: d3545653066242818a13eda3902f11b9
      Hostname: s1e8h4
       Storage: /var/lib/systemd/coredump/core.kwin_x11.1000.c215152475c6499180bd92be9206a37c.1954.1695583803000000.zst (present)
  Size on Disk: 8.8M
       Message: Process 1954 (kwin_x11) of user 1000 dumped core.
                
                Stack trace of thread 1954:
                #0  0x00007fe64de972c8 pthread_sigmask@GLIBC_2.2.5 (libc.so.6 + 0x972c8)
                #1  0x00007fe64de3f3cd sigprocmask (libc.so.6 + 0x3f3cd)
                #2  0x00007fe6511b98db _ZN6KCrash15setCrashHandlerEPFviE (libKF5Crash.so.5 + 0x58db)
                #3  0x00007fe6511bbd93 _ZN6KCrash19defaultCrashHandlerEi (libKF5Crash.so.5 + 0x7d93)
                #4  0x00007fe64de3f1b0 __restore_rt (libc.so.6 + 0x3f1b0)
                #5  0x000055b8e67981e6 n/a (kwin_x11 + 0xa21e6)
                #6  0x000055b8e67984e8 n/a (kwin_x11 + 0xa24e8)
                #7  0x00007fe650bfea2a _ZN4KWin18EffectsHandlerImpl14prePaintWindowEPNS_12EffectWindowERNS_18WindowPrePaintDataENSt6chrono8durationIlSt5ratioILl1ELl1000EEEE (libkwin.so.5 + 0x1fea2a)
                #8  0x00007fe650c82004 _ZN4KWin14WorkspaceScene24preparePaintSimpleScreenEv (libkwin.so.5 + 0x282004)
                #9  0x00007fe650c84ad5 _ZN4KWin14WorkspaceScene8prePaintEPNS_13SceneDelegateE (libkwin.so.5 + 0x284ad5)
                #10 0x00007fe650bc32df _ZN4KWin10Compositor12prePaintPassEPNS_11RenderLayerE (libkwin.so.5 + 0x1c32df)
                #11 0x00007fe650bc76ef _ZN4KWin10Compositor9compositeEPNS_10RenderLoopE (libkwin.so.5 + 0x1c76ef)
                #12 0x00007fe650bc8142 _ZN4KWin13X11Compositor9compositeEPNS_10RenderLoopE (libkwin.so.5 + 0x1c8142)
                #13 0x00007fe64f325812 n/a (libQt5Core.so.5 + 0x325812)
                #14 0x00007fe650b7b212 _ZN4KWin10RenderLoop14frameRequestedEPS0_ (libkwin.so.5 + 0x17b212)
                #15 0x00007fe650bcda53 _ZN4KWin17RenderLoopPrivate8dispatchEv (libkwin.so.5 + 0x1cda53)
                #16 0x00007fe64f325812 n/a (libQt5Core.so.5 + 0x325812)
                #17 0x00007fe64f3295ea _ZN6QTimer7timeoutENS_14QPrivateSignalE (libQt5Core.so.5 + 0x3295ea)
                #18 0x00007fe64f31922b _ZN7QObject5eventEP6QEvent (libQt5Core.so.5 + 0x31922b)
                #19 0x00007fe64e7a519e _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent (libQt5Widgets.so.5 + 0x1a519e)
                #20 0x00007fe64f2ed568 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt5Core.so.5 + 0x2ed568)
                #21 0x00007fe64f345899 _ZN14QTimerInfoList14activateTimersEv (libQt5Core.so.5 + 0x345899)
                #22 0x00007fe64f346144 n/a (libQt5Core.so.5 + 0x346144)
                #23 0x00007fe64cb13ef0 n/a (libglib-2.0.so.0 + 0x5bef0)
                #24 0x00007fe64cb15b18 n/a (libglib-2.0.so.0 + 0x5db18)
                #25 0x00007fe64cb161cc g_main_context_iteration (libglib-2.0.so.0 + 0x5e1cc)
                #26 0x00007fe64f3464a6 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5 + 0x3464a6)
                #27 0x00007fe64f2ebffb _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2ebffb)
                #28 0x00007fe64f2f4490 _ZN16QCoreApplication4execEv (libQt5Core.so.5 + 0x2f4490)
                #29 0x000055b8e673c4dd n/a (kwin_x11 + 0x464dd)
                #30 0x00007fe64de281b0 __libc_start_call_main (libc.so.6 + 0x281b0)
                #31 0x00007fe64de28279 __libc_start_main@@GLIBC_2.34 (libc.so.6 + 0x28279)
                #32 0x000055b8e673d9a5 n/a (kwin_x11 + 0x479a5)
                
                Stack trace of thread 1981:
                #0  0x00007fe64de8c50e __futex_abstimed_wait_common (libc.so.6 + 0x8c50e)
                #1  0x00007fe64de8f250 pthread_cond_wait@@GLIBC_2.3.2 (libc.so.6 + 0x8f250)
                #2  0x00007fe6418c807b n/a (/usr/lib64/dri/radeonsi_dri.so (deleted) + 0xc807b)
                ELF object binary architecture: AMD x86-64


This GDB supports auto-downloading debuginfo from the following URLs:
  <https://debuginfod.opensuse.org/>
Enable debuginfod for this session? (y or [n]) [answered N; input not from terminal]
Debuginfod has been disabled.
To make this setting permanent, add 'set debuginfod enabled off' to .gdbinit.
[New LWP 1954]
[New LWP 1981]
[New LWP 1978]
[New LWP 1979]
[New LWP 1980]
[New LWP 1986]
[New LWP 1985]
[New LWP 2004]
[New LWP 1964]
[New LWP 2005]
[New LWP 2012]
[New LWP 2013]
[New LWP 13797]
[New LWP 13796]
[New LWP 2011]
[New LWP 1997]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `/usr/bin/kwin_x11 --replace'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007fe64de972c8 in pthread_sigmask@GLIBC_2.2.5 () from /lib64/libc.so.6
[Current thread is 1 (Thread 0x7fe64b2d3a00 (LWP 1954))]
[Current thread is 11 (Thread 0x7fe611ffb6c0 (LWP 2012))]

Thread 16 (Thread 0x7fe62d3fe6c0 (LWP 1997)):
#0  0x00007fe64df09d2f in poll () at /lib64/libc.so.6
#1  0x00007fe64cb15abf in  () at /lib64/libglib-2.0.so.0
#2  0x00007fe64cb161cc in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#3  0x00007fe64f3464a6 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fe60c000b70, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#4  0x00007fe64f2ebffb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fe62d3fdb60, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:69
#5  0x00007fe64f102dce in QThread::exec() (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#6  0x00007fe650142665 in  () at /lib64/libQt5Qml.so.5
#7  0x00007fe64f103ffd in operator() (__closure=<optimized out>) at thread/qthread_unix.cpp:350
#8  (anonymous namespace)::terminate_on_exception<QThreadPrivate::start(void*)::<lambda()> > (t=<optimized out>) at thread/qthread_unix.cpp:287
#9  QThreadPrivate::start(void*) (arg=0x55b8e7944a70) at thread/qthread_unix.cpp:310
#10 0x00007fe64de8ff64 in start_thread () at /lib64/libc.so.6
#11 0x00007fe64df1847c in clone3 () at /lib64/libc.so.6

Thread 15 (Thread 0x7fe6127fc6c0 (LWP 2011)):
#0  0x00007fe64de8c50e in __futex_abstimed_wait_common () at /lib64/libc.so.6
#1  0x00007fe64de8f250 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libc.so.6
#2  0x00007fe6418c807b in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007fe641911267 in  () at /usr/lib64/dri/radeonsi_dri.so
#4  0x00007fe64de8ff64 in start_thread () at /lib64/libc.so.6
#5  0x00007fe64df1847c in clone3 () at /lib64/libc.so.6

Thread 14 (Thread 0x7fe62dbff6c0 (LWP 13796)):
#0  0x00007fe64de8c50e in __futex_abstimed_wait_common () at /lib64/libc.so.6
#1  0x00007fe64de8f250 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libc.so.6
#2  0x00007fe6418c807b in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007fe641911267 in  () at /usr/lib64/dri/radeonsi_dri.so
#4  0x00007fe64de8ff64 in start_thread () at /lib64/libc.so.6
#5  0x00007fe64df1847c in clone3 () at /lib64/libc.so.6

Thread 13 (Thread 0x7fe613fff6c0 (LWP 13797)):
#0  0x00007fe64de8c50e in __futex_abstimed_wait_common () at /lib64/libc.so.6
#1  0x00007fe64de8f250 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libc.so.6
#2  0x00007fe6418c807b in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007fe641911267 in  () at /usr/lib64/dri/radeonsi_dri.so
#4  0x00007fe64de8ff64 in start_thread () at /lib64/libc.so.6
#5  0x00007fe64df1847c in clone3 () at /lib64/libc.so.6

Thread 12 (Thread 0x7fe6117fa6c0 (LWP 2013)):
#0  0x00007fe64de8c50e in __futex_abstimed_wait_common () at /lib64/libc.so.6
#1  0x00007fe64de8f250 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libc.so.6
#2  0x00007fe6418c807b in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007fe641911267 in  () at /usr/lib64/dri/radeonsi_dri.so
#4  0x00007fe64de8ff64 in start_thread () at /lib64/libc.so.6
#5  0x00007fe64df1847c in clone3 () at /lib64/libc.so.6

Thread 11 (Thread 0x7fe611ffb6c0 (LWP 2012)):
#0  0x00007fe64de8c50e in __futex_abstimed_wait_common () at /lib64/libc.so.6
#1  0x00007fe64de8f250 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libc.so.6
#2  0x00007fe6418c807b in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007fe641911267 in  () at /usr/lib64/dri/radeonsi_dri.so
#4  0x00007fe64de8ff64 in start_thread () at /lib64/libc.so.6
#5  0x00007fe64df1847c in clone3 () at /lib64/libc.so.6

Thread 10 (Thread 0x7fe612ffd6c0 (LWP 2005)):
#0  0x00007fe64de8c50e in __futex_abstimed_wait_common () at /lib64/libc.so.6
#1  0x00007fe64de8f250 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libc.so.6
#2  0x00007fe6418c807b in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007fe641911267 in  () at /usr/lib64/dri/radeonsi_dri.so
#4  0x00007fe64de8ff64 in start_thread () at /lib64/libc.so.6
#5  0x00007fe64df1847c in clone3 () at /lib64/libc.so.6

Thread 9 (Thread 0x7fe648ead6c0 (LWP 1964)):
#0  0x00007fe64df09d2f in poll () at /lib64/libc.so.6
#1  0x00007fe64cb15abf in  () at /lib64/libglib-2.0.so.0
#2  0x00007fe64cb161cc in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#3  0x00007fe64f3464be in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fe644000b70, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007fe64f2ebffb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fe648eacb50, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:69
#5  0x00007fe64f102dce in QThread::exec() (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#6  0x00007fe64e586517 in  () at /lib64/libQt5DBus.so.5
#7  0x00007fe64f103ffd in operator() (__closure=<optimized out>) at thread/qthread_unix.cpp:350
#8  (anonymous namespace)::terminate_on_exception<QThreadPrivate::start(void*)::<lambda()> > (t=<optimized out>) at thread/qthread_unix.cpp:287
#9  QThreadPrivate::start(void*) (arg=0x7fe64e5ff060) at thread/qthread_unix.cpp:310
#10 0x00007fe64de8ff64 in start_thread () at /lib64/libc.so.6
#11 0x00007fe64df1847c in clone3 () at /lib64/libc.so.6

Thread 8 (Thread 0x7fe6137fe6c0 (LWP 2004)):
#0  0x00007fe64de8c50e in __futex_abstimed_wait_common () at /lib64/libc.so.6
#1  0x00007fe64de8f250 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libc.so.6
#2  0x00007fe6418c807b in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007fe641911267 in  () at /usr/lib64/dri/radeonsi_dri.so
#4  0x00007fe64de8ff64 in start_thread () at /lib64/libc.so.6
#5  0x00007fe64df1847c in clone3 () at /lib64/libc.so.6

Thread 7 (Thread 0x7fe62f7fe6c0 (LWP 1985)):
#0  0x00007fe64de8c50e in __futex_abstimed_wait_common () at /lib64/libc.so.6
#1  0x00007fe64de8f250 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libc.so.6
#2  0x00007fe6418c807b in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007fe641911267 in  () at /usr/lib64/dri/radeonsi_dri.so
#4  0x00007fe64de8ff64 in start_thread () at /lib64/libc.so.6
#5  0x00007fe64df1847c in clone3 () at /lib64/libc.so.6

Thread 6 (Thread 0x7fe62effd6c0 (LWP 1986)):
#0  0x00007fe64de8c50e in __futex_abstimed_wait_common () at /lib64/libc.so.6
#1  0x00007fe64de8f250 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libc.so.6
#2  0x00007fe6418c807b in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007fe641911267 in  () at /usr/lib64/dri/radeonsi_dri.so
#4  0x00007fe64de8ff64 in start_thread () at /lib64/libc.so.6
#5  0x00007fe64df1847c in clone3 () at /lib64/libc.so.6

Thread 5 (Thread 0x7fe634bff6c0 (LWP 1980)):
#0  0x00007fe64de8c50e in __futex_abstimed_wait_common () at /lib64/libc.so.6
#1  0x00007fe64de8f250 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libc.so.6
#2  0x00007fe6418c807b in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007fe641911267 in  () at /usr/lib64/dri/radeonsi_dri.so
#4  0x00007fe64de8ff64 in start_thread () at /lib64/libc.so.6
#5  0x00007fe64df1847c in clone3 () at /lib64/libc.so.6

Thread 4 (Thread 0x7fe640c536c0 (LWP 1979)):
#0  0x00007fe64de8c50e in __futex_abstimed_wait_common () at /lib64/libc.so.6
#1  0x00007fe64de8f250 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libc.so.6
#2  0x00007fe6418c807b in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007fe641911267 in  () at /usr/lib64/dri/radeonsi_dri.so
#4  0x00007fe64de8ff64 in start_thread () at /lib64/libc.so.6
#5  0x00007fe64df1847c in clone3 () at /lib64/libc.so.6

Thread 3 (Thread 0x7fe6415ca6c0 (LWP 1978)):
#0  0x00007fe64de8c50e in __futex_abstimed_wait_common () at /lib64/libc.so.6
#1  0x00007fe64de8f250 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libc.so.6
#2  0x00007fe6418c807b in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007fe641911267 in  () at /usr/lib64/dri/radeonsi_dri.so
#4  0x00007fe64de8ff64 in start_thread () at /lib64/libc.so.6
#5  0x00007fe64df1847c in clone3 () at /lib64/libc.so.6

Thread 2 (Thread 0x7fe62ffff6c0 (LWP 1981)):
#0  0x00007fe64de8c50e in __futex_abstimed_wait_common () at /lib64/libc.so.6
#1  0x00007fe64de8f250 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libc.so.6
#2  0x00007fe6418c807b in  () at /usr/lib64/dri/radeonsi_dri.so
#3  0x00007fe641911267 in  () at /usr/lib64/dri/radeonsi_dri.so
#4  0x00007fe64de8ff64 in start_thread () at /lib64/libc.so.6
#5  0x00007fe64df1847c in clone3 () at /lib64/libc.so.6

Thread 1 (Thread 0x7fe64b2d3a00 (LWP 1954)):
[KCrash Handler]
#5  0x000055b8e67981e6 in KWin::BlurEffect::blurRegion(KWin::EffectWindow const*) const (this=this@entry=0x55b8e81053c0, w=w@entry=0x55b8e86ad410) at /usr/src/debug/kwin-5.27.8/src/effects/blur/blur.cpp:473
#6  0x000055b8e67984e8 in KWin::BlurEffect::prePaintWindow(KWin::EffectWindow*, KWin::WindowPrePaintData&, std::chrono::duration<long, std::ratio<1l, 1000l> >) (presentTime=std::chrono::duration = { <optimized out>ms }, data=..., w=<optimized out>, this=0x55b8e81053c0) at /usr/src/debug/kwin-5.27.8/src/effects/blur/blur.cpp:571
#7  KWin::BlurEffect::prePaintWindow(KWin::EffectWindow*, KWin::WindowPrePaintData&, std::chrono::duration<long, std::ratio<1l, 1000l> >) (this=0x55b8e81053c0, w=<optimized out>, data=..., presentTime=std::chrono::duration = { <optimized out>ms }) at /usr/src/debug/kwin-5.27.8/src/effects/blur/blur.cpp:540
#8  0x00007fe650bfea2a in KWin::EffectsHandlerImpl::prePaintWindow(KWin::EffectWindow*, KWin::WindowPrePaintData&, std::chrono::duration<long, std::ratio<1l, 1000l> >) (this=0x55b8e7910250, w=<optimized out>, data=<optimized out>, presentTime=std::chrono::duration = { <optimized out>ms }) at /usr/src/debug/kwin-5.27.8/src/effects.cpp:415
#9  0x00007fe650c82004 in KWin::WorkspaceScene::preparePaintSimpleScreen() (this=0x55b8e79a8dc0) at /usr/src/debug/kwin-5.27.8/src/scene/workspacescene.cpp:319
#10 0x00007fe650c84ad5 in KWin::WorkspaceScene::prePaint(KWin::SceneDelegate*) (this=0x55b8e79a8dc0, delegate=<optimized out>) at /usr/src/debug/kwin-5.27.8/src/scene/workspacescene.cpp:231
#11 0x00007fe650bc32df in KWin::Compositor::prePaintPass(KWin::RenderLayer*) (this=this@entry=0x55b8e7a71130, layer=layer@entry=0x55b8e7a65800) at /usr/src/debug/kwin-5.27.8/src/composite.cpp:714
#12 0x00007fe650bc76ef in KWin::Compositor::composite(KWin::RenderLoop*) (this=0x55b8e7a71130, renderLoop=0x55b8e778d910) at /usr/src/debug/kwin-5.27.8/src/composite.cpp:657
#13 0x00007fe650bc8142 in KWin::X11Compositor::composite(KWin::RenderLoop*) (this=0x55b8e7a71130, renderLoop=<optimized out>) at /usr/src/debug/kwin-5.27.8/src/composite.cpp:961
#14 0x00007fe64f325812 in QtPrivate::QSlotObjectBase::call(QObject*, void**) (a=0x7fffac7a0880, r=0x55b8e7a71130, this=0x55b8e79345a0) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
#15 doActivate<false>(QObject*, int, void**) (sender=0x55b8e778d910, signal_index=5, argv=0x7fffac7a0880) at kernel/qobject.cpp:3925
#16 0x00007fe64f31e47f in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (sender=<optimized out>, m=m@entry=0x7fe650fc30e0, local_signal_index=local_signal_index@entry=2, argv=argv@entry=0x7fffac7a0880) at kernel/qobject.cpp:3985
#17 0x00007fe650b7b212 in KWin::RenderLoop::frameRequested(KWin::RenderLoop*) (this=<optimized out>, _t1=<optimized out>) at /usr/src/debug/kwin-5.27.8/build/src/kwin_autogen/TAC5DWH4SE/moc_renderloop.cpp:206
#18 0x00007fe650bcda53 in KWin::RenderLoopPrivate::dispatch() (this=0x55b8e778d990) at /usr/src/debug/kwin-5.27.8/src/core/renderloop.cpp:157
#19 0x00007fe64f325812 in QtPrivate::QSlotObjectBase::call(QObject*, void**) (a=0x7fffac7a09a0, r=0x55b8e778d910, this=0x55b8e778da90) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
#20 doActivate<false>(QObject*, int, void**) (sender=0x55b8e778d9a8, signal_index=3, argv=0x7fffac7a09a0) at kernel/qobject.cpp:3925
#21 0x00007fe64f31e47f in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (sender=<optimized out>, m=m@entry=0x7fe64f5c79a0, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fffac7a09a0) at kernel/qobject.cpp:3985
#22 0x00007fe64f3295ea in QTimer::timeout(QTimer::QPrivateSignal) (this=<optimized out>, _t1=...) at .moc/moc_qtimer.cpp:205
#23 0x00007fe64f31922b in QObject::event(QEvent*) (this=0x55b8e778d9a8, e=0x7fffac7a0af0) at kernel/qobject.cpp:1369
#24 0x00007fe64e7a519e in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=<optimized out>, receiver=0x55b8e778d9a8, e=0x7fffac7a0af0) at kernel/qapplication.cpp:3640
#25 0x00007fe64f2ed568 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0x55b8e778d9a8, event=0x7fffac7a0af0) at kernel/qcoreapplication.cpp:1064
#26 0x00007fe64f2ed72e in QCoreApplication::sendEvent(QObject*, QEvent*) (receiver=<optimized out>, event=<optimized out>) at kernel/qcoreapplication.cpp:1462
#27 0x00007fe64f345899 in QTimerInfoList::activateTimers() (this=0x55b8e7517180) at kernel/qtimerinfo_unix.cpp:643
#28 0x00007fe64f346144 in timerSourceDispatch(GSource*, GSourceFunc, gpointer) (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:183
#29 0x00007fe64cb13ef0 in  () at /lib64/libglib-2.0.so.0
#30 0x00007fe64cb15b18 in  () at /lib64/libglib-2.0.so.0
#31 0x00007fe64cb161cc in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#32 0x00007fe64f3464a6 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x55b8e7517300, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#33 0x00007fe64f2ebffb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fffac7a0d30, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:69
#34 0x00007fe64f2f4490 in QCoreApplication::exec() () at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#35 0x000055b8e673c4dd in main(int, char**) (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/kwin-5.27.8/src/main_x11.cpp:447

Reported using DrKonqi
Comment 1 Nate Graham 2023-09-25 17:52:11 UTC 
Cannot reproduce on Plasma 6 Wayland.
Comment 2 Roke Julian Lockhart Beedell 2023-09-25 23:35:54 UTC 
(In reply to Nate Graham from comment #1)
> Cannot reproduce on Plasma 6 Wayland.

I'm using Plasma 5 X11.
Comment 3 Guilherme Silva 2024-05-18 09:41:02 UTC 
Created attachment 169588 [details]
KWin 6.0.4 crash on X11

I think I just experienced this same crash, on Plasma 6.0.4 + X11 + NVIDIA. Full system info:

Operating System: Arch Linux 
KDE Plasma Version: 6.0.4
KDE Frameworks Version: 6.2.0
Qt Version: 6.7.0
Kernel Version: 6.9.1-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 4 × Intel® Core™ i5-3570K CPU @ 3.40GHz
Memory: 7,7 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 660/PCIe/SSE2

I can't reproduce the crash anymore, however.

I remember I just had Firefox opened, and then after I began dragging a random image from Nate's latest blog post, KWin restarted.

I'm attaching the gdb backtrace of the crash, according to this guide: https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports#Generate_backtrace_from_core
Comment 4 David Edmundson 2024-06-05 10:02:30 UTC 

*** This bug has been marked as a duplicate of bug 437925 ***