https://bugs.kde.org/show_bug.cgi?id=513607
Bug ID: 513607
Summary: Alternating between TAB and ` while holding ALT wreaks
havoc
Classification: Plasma
Product: kwin
Version First unspecified
Reported In:
Platform: Debian stable
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: wayland-generic
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Alternating between TAB and ` while holding ALT causes unusual window behaviour
if more than one program is running. Doing so with more than two programs
running causes KDE system crash.
STEPS TO REPRODUCE
1. Open more than one program (ex. System Monitor and Firefox)
2. Press Alt+Tab
3. Without releasing Alt, hit the ` key
OBSERVED RESULT
erratic behavior and or crash of KDE
EXPECTED RESULT
I was expecting window switching mode to change from "all windows" mode to
"only windows of a single program" mode.
SOFTWARE/OS VERSIONS
Debian12
Linux/KDE Plasma:
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
ADDITIONAL INFORMATION
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PID: 1541 (kwin_wayland)
UID: 1000 (orchid)
GID: 1000 (orchid)
Signal: 11 (SEGV)
Timestamp: Sat 2025-12-20 06:34:11 CST (59min ago)
Command Line: /usr/bin/kwin_wayland --wayland-fd 7 --socket wayland-0
--xwayland-fd 8 --xwayland-fd 9 --xwayland-display :1 --xwayland-xauthority
/run/user/1000/xauth_QBnHoh --xwayland
Executable: /usr/bin/kwin_wayland
Control Group:
/user.slice/user-1000.slice/[email protected]/session.slice/plasma-kwin_wayland.service
Unit: [email protected]
User Unit: plasma-kwin_wayland.service
Slice: user-1000.slice
Owner UID: 1000 (orchid)
Boot ID: 50cf356773ae40a5b4c1e26f31300e91
Machine ID: 7fdce6e2536a4c2289c39751e3f54976
Hostname: orchid-inspiron3521
Storage:
/var/lib/systemd/coredump/core.kwin_wayland.1000.50cf356773ae40a5b4c1e26f31300e91.1541.1766234051000000.zst
(inaccessible)
Message: Process 1541 (kwin_wayland) of user 1000 dumped core.
Module libsystemd.so.0 from deb systemd-252.39-1~deb12u1.amd64
Module libudev.so.1 from deb systemd-252.39-1~deb12u1.amd64
Stack trace of thread 1541:
#0 0x00007fe1a6f7ecd0 _ZNK14QOpenGLContext7surfaceEv
(libQt5Gui.so.5 + 0x17ecd0)
#1 0x00007fe1a7dedfdf n/a (libQt5Quick.so.5 + 0x1edfdf)
#2 0x00007fe1a7dea6b2 n/a (libQt5Quick.so.5 + 0x1ea6b2)
#3 0x00007fe1a7e869d0
_ZN14QQuickTextNode9addGlyphsERK7QPointFRK9QGlyphRunRK6QColorN10QQuickText9TextStyleES8_P7QSGNode
(libQt5Quick.so.5 + 0x2869d0)
#4 0x00007fe1a7e8bcf8 n/a (libQt5Quick.so.5 + 0x28bcf8)
#5 0x00007fe1a7e879e8
_ZN14QQuickTextNode13addTextLayoutERK7QPointFP11QTextLayoutRK6QColorN10QQuickText9TextStyleES7_S7_S7_S7_iiii
(libQt5Quick.so.5 + 0x2879e8)
#6 0x00007fe1a7e864b1
_ZN10QQuickText15updatePaintNodeEP7QSGNodePN10QQuickItem19UpdatePaintNodeDataE
(libQt5Quick.so.5 + 0x2864b1)
#7 0x00007fe1a7e66bc8
_ZN19QQuickWindowPrivate15updateDirtyNodeEP10QQuickItem (libQt5Quick.so.5 +
0x266bc8)
#8 0x00007fe1a7e670eb
_ZN19QQuickWindowPrivate16updateDirtyNodesEv (libQt5Quick.so.5 + 0x2670eb)
#9 0x00007fe1a7e68c3d
_ZN19QQuickWindowPrivate14syncSceneGraphEv (libQt5Quick.so.5 + 0x268c3d)
#10 0x00007fe1a7de62e7 n/a (libQt5Quick.so.5 + 0x1e62e7)
#11 0x00007fe1a7e76e20 _ZN12QQuickWindow5eventEP6QEvent
(libQt5Quick.so.5 + 0x276e20)
#12 0x00007fe1a6162fae
_ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent (libQt5Widgets.so.5 +
0x162fae)
#13 0x00007fe1a6ab1738
_ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt5Core.so.5 +
0x2b1738)
#14 0x00007fe1a6f2c4f3
_ZN15QPlatformWindow11windowEventEP6QEvent (libQt5Gui.so.5 + 0x12c4f3)
#15 0x00007fe1a616a1f9
_ZN12QApplication6notifyEP7QObjectP6QEvent (libQt5Widgets.so.5 + 0x16a1f9)
#16 0x00007fe1a6ab1738
_ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt5Core.so.5 +
0x2b1738)
#17 0x00007fe1a6b08c71 _ZN14QTimerInfoList14activateTimersEv
(libQt5Core.so.5 + 0x308c71)
#18 0x00007fe1a6b071f0
_ZN20QEventDispatcherUNIX13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE
(libQt5Core.so.5 + 0x3071f0)
#19 0x0000563226c1596d n/a (kwin_wayland + 0x14996d)
#20 0x00007fe1a6ab01bb
_ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5 +
0x2b01bb)
#21 0x00007fe1a6ab8316 _ZN16QCoreApplication4execEv
(libQt5Core.so.5 + 0x2b8316)
#22 0x0000563226b20f28 n/a (kwin_wayland + 0x54f28)
#23 0x00007fe1a5a4524a n/a (libc.so.6 + 0x2724a)
#24 0x00007fe1a5a45305 __libc_start_main (libc.so.6 + 0x27305)
#25 0x0000563226b22ee1 n/a (kwin_wayland + 0x56ee1)
Stack trace of thread 1557:
#0 0x00007fe1a5b1a25f __poll (libc.so.6 + 0xfc25f)
#1 0x00007fe1a431e90e n/a (libglib-2.0.so.0 + 0x5490e)
#2 0x00007fe1a431ea2c g_main_context_iteration
(libglib-2.0.so.0 + 0x54a2c)
#3 0x00007fe1a6b09876
_ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE
(libQt5Core.so.5 + 0x309876)
#4 0x00007fe1a6ab01bb
_ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5 +
0x2b01bb)
#5 0x00007fe1a68cabc7 _ZN7QThread4execEv (libQt5Core.so.5 +
0xcabc7)
#6 0x00007fe1a68cbd83 n/a (libQt5Core.so.5 + 0xcbd83)
#7 0x00007fe1a5aa71f5 n/a (libc.so.6 + 0x891f5)
#8 0x00007fe1a5b278dc n/a (libc.so.6 + 0x1098dc)
Stack trace of thread 1558:
#0 0x00007fe1a5aa3f16 n/a (libc.so.6 + 0x85f16)
#1 0x00007fe1a5aa65d8 pthread_cond_wait (libc.so.6 + 0x885d8)
#2 0x00007fe19e10c059 n/a (crocus_dri.so + 0x10c059)
#3 0x00007fe19e0be17b n/a (crocus_dri.so + 0xbe17b)
#4 0x00007fe19e10bf97 n/a (crocus_dri.so + 0x10bf97)
#5 0x00007fe1a5aa71f5 n/a (libc.so.6 + 0x891f5)
#6 0x00007fe1a5b278dc n/a (libc.so.6 + 0x1098dc)
Stack trace of thread 1556:
#0 0x00007fe1a5aa3f16 n/a (libc.so.6 + 0x85f16)
#1 0x00007fe1a5aa65d8 pthread_cond_wait (libc.so.6 + 0x885d8)
#2 0x00007fe19e10c059 n/a (crocus_dri.so + 0x10c059)
#3 0x00007fe19e0be17b n/a (crocus_dri.so + 0xbe17b)
#4 0x00007fe19e10bf97 n/a (crocus_dri.so + 0x10bf97)
#5 0x00007fe1a5aa71f5 n/a (libc.so.6 + 0x891f5)
#6 0x00007fe1a5b278dc n/a (libc.so.6 + 0x1098dc)
Stack trace of thread 5769:
#0 0x00007fe1a5aa3f16 n/a (libc.so.6 + 0x85f16)
#1 0x00007fe1a5aa65d8 pthread_cond_wait (libc.so.6 + 0x885d8)
#2 0x00007fe19e10c059 n/a (crocus_dri.so + 0x10c059)
#3 0x00007fe19e0be17b n/a (crocus_dri.so + 0xbe17b)
#4 0x00007fe19e10bf97 n/a (crocus_dri.so + 0x10bf97)
#5 0x00007fe1a5aa71f5 n/a (libc.so.6 + 0x891f5)
#6 0x00007fe1a5b278dc n/a (libc.so.6 + 0x1098dc)
Stack trace of thread 1554:
#0 0x00007fe1a5b1a25f __poll (libc.so.6 + 0xfc25f)
#1 0x00007fe1a431e90e n/a (libglib-2.0.so.0 + 0x5490e)
#2 0x00007fe1a431ea2c g_main_context_iteration
(libglib-2.0.so.0 + 0x54a2c)
#3 0x00007fe1a6b09876
_ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE
(libQt5Core.so.5 + 0x309876)
#4 0x00007fe1a6ab01bb
_ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5 +
0x2b01bb)
#5 0x00007fe1a68cabc7 _ZN7QThread4execEv (libQt5Core.so.5 +
0xcabc7)
#6 0x00007fe1a8ab7487 n/a (libQt5DBus.so.5 + 0x17487)
#7 0x00007fe1a68cbd83 n/a (libQt5Core.so.5 + 0xcbd83)
#8 0x00007fe1a5aa71f5 n/a (libc.so.6 + 0x891f5)
#9 0x00007fe1a5b278dc n/a (libc.so.6 + 0x1098dc)
Stack trace of thread 1561:
#0 0x00007fe1a5b1a25f __poll (libc.so.6 + 0xfc25f)
#1 0x00007fe1a431e90e n/a (libglib-2.0.so.0 + 0x5490e)
#2 0x00007fe1a431ea2c g_main_context_iteration
(libglib-2.0.so.0 + 0x54a2c)
#3 0x00007fe1a6b09876
_ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE
(libQt5Core.so.5 + 0x309876)
#4 0x00007fe1a6ab01bb
_ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5 +
0x2b01bb)
#5 0x00007fe1a68cabc7 _ZN7QThread4execEv (libQt5Core.so.5 +
0xcabc7)
#6 0x00007fe1a7928555 n/a (libQt5Qml.so.5 + 0x328555)
#7 0x00007fe1a68cbd83 n/a (libQt5Core.so.5 + 0xcbd83)
#8 0x00007fe1a5aa71f5 n/a (libc.so.6 + 0x891f5)
#9 0x00007fe1a5b278dc n/a (libc.so.6 + 0x1098dc)
Stack trace of thread 1559:
#0 0x00007fe1a5aa3f16 n/a (libc.so.6 + 0x85f16)
#1 0x00007fe1a5aa65d8 pthread_cond_wait (libc.so.6 + 0x885d8)
#2 0x00007fe19e10c059 n/a (crocus_dri.so + 0x10c059)
#3 0x00007fe19e0be17b n/a (crocus_dri.so + 0xbe17b)
#4 0x00007fe19e10bf97 n/a (crocus_dri.so + 0x10bf97)
#5 0x00007fe1a5aa71f5 n/a (libc.so.6 + 0x891f5)
#6 0x00007fe1a5b278dc n/a (libc.so.6 + 0x1098dc)
Stack trace of thread 8693:
#0 0x00007fe1a5b1a25f __poll (libc.so.6 + 0xfc25f)
#1 0x00007fe1a431e90e n/a (libglib-2.0.so.0 + 0x5490e)
#2 0x00007fe1a431ea2c g_main_context_iteration
(libglib-2.0.so.0 + 0x54a2c)
#3 0x00007fe1a6b09876
_ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE
(libQt5Core.so.5 + 0x309876)
#4 0x00007fe1a6ab01bb
_ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5 +
0x2b01bb)
#5 0x00007fe1a68cabc7 _ZN7QThread4execEv (libQt5Core.so.5 +
0xcabc7)
#6 0x00007fe1a7928555 n/a (libQt5Qml.so.5 + 0x328555)
#7 0x00007fe1a68cbd83 n/a (libQt5Core.so.5 + 0xcbd83)
#8 0x00007fe1a5aa71f5 n/a (libc.so.6 + 0x891f5)
#9 0x00007fe1a5b278dc n/a (libc.so.6 + 0x1098dc)
ELF object binary architecture: AMD x86-64
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