https://bugs.kde.org/show_bug.cgi?id=491648
Bug ID: 491648
Summary: kwin_wayland busyloops processing
"zwp_primary_selection_source_v1_requests" messages
when screen is locked
Classification: Plasma
Product: kwin
Version: 6.1.4
Platform: Other
OS: Other
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: anars...@gmail.com
Target Milestone: ---
***
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***
SUMMARY
kwin_wayland and plasmashell consume 100% of a single CPU core when screen is
locked.
STEPS TO REPRODUCE
1. lock screen
2. ssh into your system
3. run top, observe kwin_wayland and plasmashell consuming 100% of a single CPU
core
OBSERVED RESULT
kwin_wayland and plasmashell consume 100% of a single CPU core
EXPECTED RESULT
kwin_wayland and plasmashell are idle
SOFTWARE/OS VERSIONS
Windows:
macOS:
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: Archlinux
KDE Plasma Version: 6.1.4
KDE Frameworks Version: 6.4.0
Qt Version: 6.7.2
ADDITIONAL INFORMATION
plasmashell backtrace:
#0 QPlatformClipboard::emitChanged (this=0x561ea0b792a0,
mode=QClipboard::Clipboard) at
/usr/src/debug/qt6-base/qtbase/src/gui/kernel/qplatformclipboard.cpp:87
#1 0x0000715a5cfc6b11 in SystemClipboard::setMimeData (this=0x561ea1d6fd50,
data=0x561ea0f7d260, mode=QClipboard::Clipboard) at
/usr/src/debug/plasma-workspace/plasma-workspace-6.1.4/klipper/systemclipboard.cpp:112
#2 Klipper::setClipboard (this=this@entry=0x561ea1da6ef0, item=...,
mode=mode@entry=2,
updateReason=updateReason@entry=Klipper::ClipboardUpdateReason::PreventEmptyClipboard)
at
/usr/src/debug/plasma-workspace/plasma-workspace-6.1.4/klipper/klipper.cpp:688
#3 0x0000715a5cfc6fba in Klipper::slotReceivedEmptyClipboard
(this=0x561ea1da6ef0, mode=QClipboard::Clipboard) at
/usr/src/debug/plasma-workspace/plasma-workspace-6.1.4/klipper/klipper.cpp:544
#4 0x0000715a95ba16f7 in QtPrivate::QSlotObjectBase::call (this=<optimized
out>, r=<optimized out>, a=<optimized out>, this=<optimized out>, r=<optimized
out>, a=<optimized out>) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobjectdefs_impl.h:469
#5 doActivate<false> (sender=<optimized out>, signal_index=<optimized out>,
argv=<optimized out>) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobject.cpp:4086
#6 0x0000715a5cfdbb51 in SystemClipboard::receivedEmptyClipboard
(this=0x561ea1d6fd50, _t1=QClipboard::Clipboard) at
/usr/src/debug/plasma-workspace/build/klipper/libklipper_common_static_autogen/include/moc_systemclipboard.cpp:210
#7 SystemClipboard::checkClipData (this=0x561ea1d6fd50,
mode=QClipboard::Clipboard) at
/usr/src/debug/plasma-workspace/plasma-workspace-6.1.4/klipper/systemclipboard.cpp:155
#8 0x0000715a95ba16f7 in QtPrivate::QSlotObjectBase::call (this=<optimized
out>, r=<optimized out>, a=<optimized out>, this=<optimized out>, r=<optimized
out>, a=<optimized out>) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobjectdefs_impl.h:469
#9 doActivate<false> (sender=<optimized out>, signal_index=<optimized out>,
argv=<optimized out>) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobject.cpp:4086
#10 0x0000715a9691db01 in KSystemClipboard::changed (this=<optimized out>,
_t1=<optimized out>) at
/usr/src/debug/kguiaddons/build/src/KF6GuiAddons_autogen/include/moc_ksystemclipboard.cpp:142
#11 0x0000715a95ba16f7 in QtPrivate::QSlotObjectBase::call (this=<optimized
out>, r=<optimized out>, a=<optimized out>, this=<optimized out>, r=<optimized
out>, a=<optimized out>) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobjectdefs_impl.h:469
#12 doActivate<false> (sender=<optimized out>, signal_index=<optimized out>,
argv=<optimized out>) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobject.cpp:4086
#13 0x0000715a961a1a7f in QClipboard::changed (this=0x561ea120f5a0,
_t1=<optimized out>) at
/usr/src/debug/qt6-base/build/src/gui/Gui_autogen/include/moc_qclipboard.cpp:181
#14 QClipboard::emitChanged (this=0x561ea120f5a0, mode=QClipboard::Clipboard)
at /usr/src/debug/qt6-base/qtbase/src/gui/kernel/qclipboard.cpp:558
#15 QPlatformClipboard::emitChanged (this=<optimized out>,
mode=QClipboard::Clipboard) at
/usr/src/debug/qt6-base/qtbase/src/gui/kernel/qplatformclipboard.cpp:89
#16 QPlatformClipboard::emitChanged (this=<optimized out>,
mode=QClipboard::Clipboard) at
/usr/src/debug/qt6-base/qtbase/src/gui/kernel/qplatformclipboard.cpp:86
#17 0x0000715a95ba16f7 in QtPrivate::QSlotObjectBase::call (this=<optimized
out>, r=<optimized out>, a=<optimized out>, this=<optimized out>, r=<optimized
out>, a=<optimized out>) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobjectdefs_impl.h:469
#18 doActivate<false> (sender=<optimized out>, signal_index=<optimized out>,
argv=<optimized out>) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobject.cpp:4086
#19 0x0000715a96f3e596 in ffi_call_unix64 () at ../src/x86/unix64.S:104
#20 0x0000715a96f3b00e in ffi_call_int (cif=cif@entry=0x7ffc45d71330,
fn=<optimized out>, rvalue=<optimized out>, avalue=<optimized out>,
closure=closure@entry=0x0) at ../src/x86/ffi64.c:673
#21 0x0000715a96f3dbd3 in ffi_call (cif=cif@entry=0x7ffc45d71330, fn=<optimized
out>, rvalue=rvalue@entry=0x0, avalue=avalue@entry=0x7ffc45d71400) at
../src/x86/ffi64.c:710
#22 0x0000715a984fe860 in wl_closure_invoke
(closure=closure@entry=0x715a6c003900, target=<optimized out>,
target@entry=0x561ea1f94fe0, opcode=opcode@entry=2, data=<optimized out>,
flags=1) at ../wayland-1.23.0/src/connection.c:1228
#23 0x0000715a984ff0d9 in dispatch_event (display=display@entry=0x561ea0a22d50,
queue=queue@entry=0x561ea0a22e48) at
../wayland-1.23.0/src/wayland-client.c:1670
#24 0x0000715a984ff4f3 in dispatch_queue (display=0x561ea0a22d50,
queue=0x561ea0a22e48) at ../wayland-1.23.0/src/wayland-client.c:1816
#25 wl_display_dispatch_queue_pending (display=0x561ea0a22d50,
queue=0x561ea0a22e48) at ../wayland-1.23.0/src/wayland-client.c:2058
#26 0x0000715a9774c456 in QtWaylandClient::QWaylandDisplay::qt_static_metacall
(_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized
out>) at
/usr/src/debug/qt6-wayland/qtwayland/src/client/qwaylanddisplay.cpp:227
#27 0x0000715a95ba194a in doActivate<false> (sender=<optimized out>,
signal_index=<optimized out>, argv=<optimized out>) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobject.cpp:4098
#28 0x0000715a95da2d05 in QAbstractEventDispatcher::awake (this=0x561ea0b89cc0)
at
/usr/src/debug/qt6-base/build/src/corelib/Core_autogen/include/moc_qabstracteventdispatcher.cpp:158
#29 QEventDispatcherGlib::processEvents (this=0x561ea0b89cc0, flags=...) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:401
#30 0x0000715a95b4f01e in QEventLoop::processEvents (this=0x7ffc45d717c0,
flags=...) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qeventloop.cpp:100
#31 QEventLoop::exec (this=0x7ffc45d717c0, flags=...) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qeventloop.cpp:182
#32 0x0000715a95b4934d in QCoreApplication::exec () at
/usr/src/debug/qt6-base/qtbase/src/corelib/global/qflags.h:74
#33 0x0000715a97af83ba in QApplication::exec () at
/usr/src/debug/qt6-base/qtbase/src/widgets/kernel/qapplication.cpp:2555
#34 0x0000561e686d7d86 in main (argc=<optimized out>, argv=<optimized out>) at
/usr/src/debug/plasma-workspace/plasma-workspace-6.1.4/shell/main.cpp:188
kwin_wayland backtrace:
Thread 1 "kwin_wayland" hit Breakpoint 4, wl_client_connection_data
(fd=<optimized out>, mask=<optimized out>, data=0x5e5ad315a060) at
../wayland-1.23.0/src/wayland-server.c:409
409 if (!(resource_flags & WL_MAP_ENTRY_LEGACY) &&
(gdb) print message
$39 = (const struct wl_message *) 0x70fce9d254d8
<zwp_primary_selection_source_v1_requests.lto_priv+24>
(gdb) bt
#0 wl_client_connection_data (fd=<optimized out>, mask=<optimized out>,
data=0x5e5ad315a060) at ../wayland-1.23.0/src/wayland-server.c:409
#1 0x000070fce7c7f0a2 in wl_event_loop_dispatch (loop=0x5e5ad213aea0,
timeout=<optimized out>) at ../wayland-1.23.0/src/event-loop.c:1105
#2 0x000070fce9a767fa in KWin::Display::dispatchEvents (this=<optimized out>)
at /usr/src/debug/kwin/kwin-6.1.4/src/wayland/display.cpp:121
#3 0x000070fce6fa16f7 in QtPrivate::QSlotObjectBase::call (this=<optimized
out>, r=<optimized out>, a=<optimized out>, this=<optimized out>, r=<optimized
out>, a=<optimized out>) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobjectdefs_impl.h:469
#4 doActivate<false> (sender=<optimized out>, signal_index=<optimized out>,
argv=<optimized out>) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobject.cpp:4086
#5 0x000070fce6faa850 in QSocketNotifier::activated (this=0x5e5ad2fef0b0,
_t1=..., _t2=<optimized out>, _t3=...) at
/usr/src/debug/qt6-base/build/src/corelib/Core_autogen/include/moc_qsocketnotifier.cpp:195
#6 QSocketNotifier::event (this=0x5e5ad2fef0b0, e=<optimized out>) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qsocketnotifier.cpp:327
#7 0x000070fce80fc51c in QApplicationPrivate::notify_helper (this=<optimized
out>, receiver=0x5e5ad2fef0b0, e=0x7ffd58556eb0) at
/usr/src/debug/qt6-base/qtbase/src/widgets/kernel/qapplication.cpp:3287
#8 0x000070fce6f44d28 in QCoreApplication::notifyInternal2
(receiver=0x5e5ad2fef0b0, event=0x7ffd58556eb0) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qcoreapplication.cpp:1142
#9 0x000070fce70c5b60 in QCoreApplication::sendEvent (receiver=<optimized
out>, event=0x7ffd58556eb0) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qcoreapplication.cpp:1583
#10 QEventDispatcherUNIXPrivate::activateSocketNotifiers
(this=this@entry=0x5e5ad20c26a0) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qeventdispatcher_unix.cpp:251
#11 0x000070fce70c6676 in QEventDispatcherUNIX::processEvents (this=<optimized
out>, flags=..., flags@entry=...) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qeventdispatcher_unix.cpp:467
#12 0x000070fce79f9693 in QUnixEventDispatcherQPA::processEvents
(this=<optimized out>, flags=...) at
/usr/src/debug/qt6-base/qtbase/src/gui/platform/unix/qunixeventdispatcher.cpp:27
#13 0x000070fce6f4f01e in QEventLoop::processEvents (this=0x7ffd58557090,
flags=...) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qeventloop.cpp:100
#14 QEventLoop::exec (this=0x7ffd58557090, flags=...) at
/usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qeventloop.cpp:182
#15 0x000070fce6f4934d in QCoreApplication::exec () at
/usr/src/debug/qt6-base/qtbase/src/corelib/global/qflags.h:74
#16 0x000070fce80f83ba in QApplication::exec () at
/usr/src/debug/qt6-base/qtbase/src/widgets/kernel/qapplication.cpp:2555
#17 0x00005e5ac5684035 in main (argc=<optimized out>, argv=<optimized out>) at
/usr/src/debug/kwin/kwin-6.1.4/src/main_wayland.cpp:639
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