https://bugs.kde.org/show_bug.cgi?id=483265
--- Comment #2 from jfgor...@yahoo.com ---
More details from one of the core dump files. See end of this comment for stack
trace.
$ coredumpctl debug
PID: 43368 (kwin_x11)
UID: 1000 (...)
GID: 1000 (...)
Signal: 11 (SEGV)
Timestamp: Mon 2024-03-11 11:11:40 PDT (8h 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 (...)
Boot ID: 30e2661df8714b19ac6329370a270baf
Machine ID: 46a9da6614144c20accc36ef53b6d08a
Hostname: ...
Storage:
/var/lib/systemd/coredump/core.kwin_x11.1000.30e2661df8714b19ac6329370a270baf.43368.1710180700000000.zst
(present)
Size on Disk: 5.7M
Message: Process 43368 (kwin_x11) of user 1000 dumped core.
Stack trace of thread 43368:
#0 0x00007a95fbb90479 _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x390479)
#1 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#2 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#3 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#4 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#5 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#6 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#7 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#8 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#9 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#10 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#11 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#12 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#13 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#14 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#15 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#16 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#17 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#18 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#19 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#20 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#21 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#22 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#23 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#24 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#25 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#26 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#27 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#28 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#29 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#30 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#31 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#32 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#33 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#34 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#35 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#36 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#37 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#38 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#39 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#40 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#41 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#42 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#43 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#44 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#45 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#46 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#47 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#48 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#49 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#50 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#51 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#52 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#53 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#54 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#55 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#56 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#57 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#58 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#59 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#60 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#61 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#62 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
#63 0x00007a95fbb904cd _ZN4KWin9X11Window9findModalEb
(libkwin.so.6 + 0x3904cd)
Stack trace of thread 43385:
#0 0x00007a95f9d190bf __poll (libc.so.6 + 0xfb0bf)
#1 0x00007a95f7f6c2f6 n/a (libglib-2.0.so.0 + 0xb82f6)
#2 0x00007a95f7f0c162 g_main_context_iteration
(libglib-2.0.so.0 + 0x58162)
#3 0x00007a95f91739c4
_ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE
(libQt6Core.so.6 + 0x3739c4)
#4 0x00007a95f8f43d6e
_ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 +
0x143d6e)
#5 0x00007a95f902106f _ZN7QThread4execEv (libQt6Core.so.6 +
0x22106f)
#6 0x00007a95fa6139df n/a (libQt6DBus.so.6 + 0x299df)
#7 0x00007a95f90a0bd3 n/a (libQt6Core.so.6 + 0x2a0bd3)
#8 0x00007a95f9ca955a n/a (libc.so.6 + 0x8b55a)
#9 0x00007a95f9d26a3c n/a (libc.so.6 + 0x108a3c)
Stack trace of thread 43387:
#0 0x00007a95f9ca5ebe n/a (libc.so.6 + 0x87ebe)
#1 0x00007a95f9ca8a65 pthread_cond_timedwait (libc.so.6 +
0x8aa65)
#2 0x00007a95f90a3ba4
_ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt6Core.so.6 + 0x2a3ba4)
#3 0x00007a95f90a64aa n/a (libQt6Core.so.6 + 0x2a64aa)
#4 0x00007a95f90a0bd3 n/a (libQt6Core.so.6 + 0x2a0bd3)
#5 0x00007a95f9ca955a n/a (libc.so.6 + 0x8b55a)
#6 0x00007a95f9d26a3c n/a (libc.so.6 + 0x108a3c)
Stack trace of thread 43388:
#0 0x00007a95f9ca5ebe n/a (libc.so.6 + 0x87ebe)
#1 0x00007a95f9ca8a65 pthread_cond_timedwait (libc.so.6 +
0x8aa65)
#2 0x00007a95f90a3ba4
_ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt6Core.so.6 + 0x2a3ba4)
#3 0x00007a95f90a64aa n/a (libQt6Core.so.6 + 0x2a64aa)
#4 0x00007a95f90a0bd3 n/a (libQt6Core.so.6 + 0x2a0bd3)
#5 0x00007a95f9ca955a n/a (libc.so.6 + 0x8b55a)
#6 0x00007a95f9d26a3c n/a (libc.so.6 + 0x108a3c)
Stack trace of thread 43389:
#0 0x00007a95f9ca5ebe n/a (libc.so.6 + 0x87ebe)
#1 0x00007a95f9ca8a65 pthread_cond_timedwait (libc.so.6 +
0x8aa65)
#2 0x00007a95f90a3ba4
_ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt6Core.so.6 + 0x2a3ba4)
#3 0x00007a95f90a64aa n/a (libQt6Core.so.6 + 0x2a64aa)
#4 0x00007a95f90a0bd3 n/a (libQt6Core.so.6 + 0x2a0bd3)
#5 0x00007a95f9ca955a n/a (libc.so.6 + 0x8b55a)
#6 0x00007a95f9d26a3c n/a (libc.so.6 + 0x108a3c)
Stack trace of thread 43386:
#0 0x00007a95f9d190bf __poll (libc.so.6 + 0xfb0bf)
#1 0x00007a95fc00220b n/a (libxcb.so.1 + 0xd20b)
#2 0x00007a95fc003f3d xcb_wait_for_event (libxcb.so.1 +
0xef3d)
#3 0x00007a95f3d66f4e n/a (libQt6XcbQpa.so.6 + 0x4bf4e)
#4 0x00007a95f90a0bd3 n/a (libQt6Core.so.6 + 0x2a0bd3)
#5 0x00007a95f9ca955a n/a (libc.so.6 + 0x8b55a)
#6 0x00007a95f9d26a3c n/a (libc.so.6 + 0x108a3c)
Stack trace of thread 43390:
#0 0x00007a95f9ca5ebe n/a (libc.so.6 + 0x87ebe)
#1 0x00007a95f9ca8a65 pthread_cond_timedwait (libc.so.6 +
0x8aa65)
#2 0x00007a95f90a3ba4
_ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt6Core.so.6 + 0x2a3ba4)
#3 0x00007a95f90a64aa n/a (libQt6Core.so.6 + 0x2a64aa)
#4 0x00007a95f90a0bd3 n/a (libQt6Core.so.6 + 0x2a0bd3)
#5 0x00007a95f9ca955a n/a (libc.so.6 + 0x8b55a)
#6 0x00007a95f9d26a3c n/a (libc.so.6 + 0x108a3c)
ELF object binary architecture: AMD x86-64
Core was generated by `/usr/bin/kwin_x11 --replace'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007a95fbb90479 in KWin::X11Window::findModal (this=0x651e34bea620,
allow_itself=true) at /usr/include/qt6/QtCore/qarraydatapointer.h:114
114 const T *data() const noexcept { return ptr; }
[Current thread is 1 (Thread 0x7a95f3dbda00 (LWP 43368))]
Stack trace with gdb bt command is huge and never stops printing:
...
#7462 0x00007a95fbb904cd in KWin::X11Window::findModal (this=0x651e34062960,
allow_itself=true) at /usr/src/debug/kwin/kwin-6.0.1/src/x11window.cpp:3500
#7463 0x00007a95fbb904cd in KWin::X11Window::findModal (this=0x651e33f92f20,
allow_itself=true) at /usr/src/debug/kwin/kwin-6.0.1/src/x11window.cpp:3500
#7464 0x00007a95fbb904cd in KWin::X11Window::findModal (this=0x651e357c01b0,
allow_itself=true) at /usr/src/debug/kwin/kwin-6.0.1/src/x11window.cpp:3500
#7465 0x00007a95fbb904cd in KWin::X11Window::findModal (this=0x651e3579d920,
allow_itself=true) at /usr/src/debug/kwin/kwin-6.0.1/src/x11window.cpp:3500
#7466 0x00007a95fbb904cd in KWin::X11Window::findModal (this=0x651e35654270,
allow_itself=true) at /usr/src/debug/kwin/kwin-6.0.1/src/x11window.cpp:3500
...
(gdb) f 0
#0 0x00007a95fbb90479 in KWin::X11Window::findModal (this=0x651e34bea620,
allow_itself=true) at /usr/include/qt6/QtCore/qarraydatapointer.h:114
114 const T *data() const noexcept { return ptr; }
(gdb) f 1
#1 0x00007a95fbb904cd in KWin::X11Window::findModal (this=0x651e34bc5a90,
allow_itself=true) at /usr/src/debug/kwin/kwin-6.0.1/src/x11window.cpp:3500
3500 if (Window *ret = (*it)->findModal(true)) {
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