https://bugs.kde.org/show_bug.cgi?id=393804
Harald Sitter <sit...@kde.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |sit...@kde.org
--- Comment #3 from Harald Sitter <sit...@kde.org> ---
I can reproduce this on neon with Plasma 5.12.5 (+ Qt 5.10 + Ubuntu 16.04 base)
for the host and Plasma master (+ Qt 5.10 + Ubuntu 18.04 base) as guest in the
VM.
A couple of observations:
Doesn't happen if you disable clipboard sync (e.g. `virt-xml neonUnstableBionic
--update --edit --graphics
spice,listen=127.0.0.1,port=5900,clipboard_copypaste=no`)
The freeze also doesn't happen when you leave clipboard sync enabled but
disable the host klipper (e.g. remove the systray applet). Kinda expected but I
thought I'd point it out. To the same end disabling the guest klipper does the
same, albeit even more obvious since it freezes in the code you'd disable xD.
Disabling the `newClipData`/`slotCheckPending` function of klipper on the host
also seems to prevent the freeze, not sure what that tells us other than the
host doing something which then prompts the freeze in the guest.
The guest Plasma doesn't always freeze, sometimes it doesn't for a dozen
copies, sometimes it does after only a couple. What then seems to happen is it
hitting a timeout as after numerous seconds it will unfreeze again.
For my host the plasma never freezes, it does however sometimes seem to "lose"
a paste. Say I am in konsole, copy something, then go to firefox and paste it,
nothing pastes and the klipper history has an empty entry. I am not entirely
sure this is related, but it certainly seems to only happen when I also have a
Plasma VM running.
The last two points particularly make me think that this is maybe a race
condition between the two klippers. Why one freezes and the other doesn't is
somewhat beyond me though. Might also be a loop between the two, but then I'd
expect more consistent freezing on both ends.
Backtrace of the Guest Plasma (the frozen one).
Thread 10 (Thread 0x7f80ad06b700 (LWP 4875)):
#0 0x00007f8191320ed9 in futex_reltimed_wait_cancelable (private=<optimized
out>, reltime=0x7f80ad06ac00, expected=0,
futex_word=0x55c4889fc5a0) at
../sysdeps/unix/sysv/linux/futex-internal.h:142
#1 __pthread_cond_wait_common (abstime=0x7f80ad06acc0, mutex=0x55c4889fc550,
cond=0x55c4889fc578) at pthread_cond_wait.c:533
#2 __pthread_cond_timedwait (cond=0x55c4889fc578, mutex=0x55c4889fc550,
abstime=0x7f80ad06acc0) at pthread_cond_wait.c:667
#3 0x00007f81921a2eb8 in QWaitConditionPrivate::wait_relative (time=30000,
this=0x55c4889fc550) at thread/qwaitcondition_unix.cpp:133
#4 QWaitConditionPrivate::wait (time=30000, this=0x55c4889fc550) at
thread/qwaitcondition_unix.cpp:141
#5 QWaitCondition::wait (this=this@entry=0x55c48864d140,
mutex=mutex@entry=0x55c48863ceb0, time=30000) at
thread/qwaitcondition_unix.cpp:215
#6 0x00007f819219eefd in QThreadPoolThread::run (this=0x55c48864d130) at
thread/qthreadpool.cpp:146
#7 0x00007f81921a1b8f in QThreadPrivate::start (arg=0x55c48864d130) at
thread/qthread_unix.cpp:376
#8 0x00007f819131a6db in start_thread (arg=0x7f80ad06b700) at
pthread_create.c:463
#9 0x00007f8191a9488f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95
Thread 9 (Thread 0x7f80c0d2c700 (LWP 4857)):
#0 0x00007f8191a87bf9 in __GI___poll (fds=0x7f80bc006470, nfds=1,
timeout=3500478) at ../sysdeps/unix/sysv/linux/poll.c:29
#1 0x00007f818b8b0439 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00007f818b8b054c in g_main_context_iteration () from
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3 0x00007f81923e2c9f in QEventDispatcherGlib::processEvents
(this=0x7f80bc000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#4 0x00007f819238673a in QEventLoop::exec (this=this@entry=0x7f80c0d2bd20,
flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#5 0x00007f819219c82a in QThread::exec (this=<optimized out>) at
thread/qthread.cpp:522
#6 0x00007f80c368a067 in KCupsConnection::run() () from
/usr/lib/x86_64-linux-gnu/libkcupslib.so
#7 0x00007f81921a1b8f in QThreadPrivate::start (arg=0x55c4871a6930) at
thread/qthread_unix.cpp:376
#8 0x00007f819131a6db in start_thread (arg=0x7f80c0d2c700) at
pthread_create.c:463
#9 0x00007f8191a9488f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95
Thread 8 (Thread 0x7f80d689f700 (LWP 4847)):
#0 0x00007f8191a87bf9 in __GI___poll (fds=0x7f80d0005220, nfds=1, timeout=-1)
at ../sysdeps/unix/sysv/linux/poll.c:29
#1 0x00007f818b8b0439 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00007f818b8b054c in g_main_context_iteration () from
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3 0x00007f81923e2c9f in QEventDispatcherGlib::processEvents
(this=0x7f80d0000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#4 0x00007f819238673a in QEventLoop::exec (this=this@entry=0x7f80d689ecf0,
flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#5 0x00007f819219c82a in QThread::exec (this=<optimized out>) at
thread/qthread.cpp:522
#6 0x00007f8196123c36 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7 0x00007f81921a1b8f in QThreadPrivate::start (arg=0x55c485db9fc0) at
thread/qthread_unix.cpp:376
#8 0x00007f819131a6db in start_thread (arg=0x7f80d689f700) at
pthread_create.c:463
#9 0x00007f8191a9488f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95
Thread 7 (Thread 0x7f80e7d62700 (LWP 4832)):
#0 0x00007f81913209f3 in futex_wait_cancelable (private=<optimized out>,
expected=0, futex_word=0x55c485b94538)
at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1 __pthread_cond_wait_common (abstime=0x0, mutex=0x55c485b944e8,
cond=0x55c485b94510) at pthread_cond_wait.c:502
#2 __pthread_cond_wait (cond=0x55c485b94510, mutex=0x55c485b944e8) at
pthread_cond_wait.c:655
#3 0x00007f81716ce86b in ?? () from
/usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#4 0x00007f81716ce6e7 in ?? () from
/usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#5 0x00007f819131a6db in start_thread (arg=0x7f80e7d62700) at
pthread_create.c:463
#6 0x00007f8191a9488f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95
Thread 6 (Thread 0x7f80e8563700 (LWP 4831)):
#0 0x00007f81913209f3 in futex_wait_cancelable (private=<optimized out>,
expected=0, futex_word=0x55c485b943d0)
at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1 __pthread_cond_wait_common (abstime=0x0, mutex=0x55c485b94380,
cond=0x55c485b943a8) at pthread_cond_wait.c:502
#2 __pthread_cond_wait (cond=0x55c485b943a8, mutex=0x55c485b94380) at
pthread_cond_wait.c:655
#3 0x00007f81716ce86b in ?? () from
/usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#4 0x00007f81716ce6e7 in ?? () from
/usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#5 0x00007f819131a6db in start_thread (arg=0x7f80e8563700) at
pthread_create.c:463
#6 0x00007f8191a9488f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95
Thread 5 (Thread 0x7f81739db700 (LWP 4825)):
#0 0x00007f81913209f3 in futex_wait_cancelable (private=<optimized out>,
expected=0, futex_word=0x7f8198336fb8)
at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1 __pthread_cond_wait_common (abstime=0x0, mutex=0x7f8198336f68,
cond=0x7f8198336f90) at pthread_cond_wait.c:502
#2 __pthread_cond_wait (cond=0x7f8198336f90, mutex=0x7f8198336f68) at
pthread_cond_wait.c:655
#3 0x00007f8198041904 in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#4 0x00007f8198041949 in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#5 0x00007f819131a6db in start_thread (arg=0x7f81739db700) at
pthread_create.c:463
#6 0x00007f8191a9488f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95
Thread 4 (Thread 0x7f817a122700 (LWP 4815)):
#0 0x00007f8191a87bf9 in __GI___poll (fds=0x7f816c004a00, nfds=1, timeout=-1)
at ../sysdeps/unix/sysv/linux/poll.c:29
#1 0x00007f818b8b0439 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00007f818b8b054c in g_main_context_iteration () from
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3 0x00007f81923e2c9f in QEventDispatcherGlib::processEvents
(this=0x7f816c000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#4 0x00007f819238673a in QEventLoop::exec (this=this@entry=0x7f817a121d40,
flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#5 0x00007f819219c82a in QThread::exec (this=<optimized out>) at
thread/qthread.cpp:522
#6 0x00007f8195cd17d5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7 0x00007f81921a1b8f in QThreadPrivate::start (arg=0x55c48594cd80) at
thread/qthread_unix.cpp:376
#8 0x00007f819131a6db in start_thread (arg=0x7f817a122700) at
pthread_create.c:463
#9 0x00007f8191a9488f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95
Thread 3 (Thread 0x7f817bb67700 (LWP 4799)):
#0 0x00007f8191a87bf9 in __GI___poll (fds=0x7f8174012790, nfds=4, timeout=-1)
at ../sysdeps/unix/sysv/linux/poll.c:29
#1 0x00007f818b8b0439 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00007f818b8b054c in g_main_context_iteration () from
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3 0x00007f81923e2c9f in QEventDispatcherGlib::processEvents
(this=0x7f8174000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#4 0x00007f819238673a in QEventLoop::exec (this=this@entry=0x7f817bb66d30,
flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#5 0x00007f819219c82a in QThread::exec (this=<optimized out>) at
thread/qthread.cpp:522
#6 0x00007f819469ddf5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7 0x00007f81921a1b8f in QThreadPrivate::start (arg=0x7f8194910d60) at
thread/qthread_unix.cpp:376
#8 0x00007f819131a6db in start_thread (arg=0x7f817bb67700) at
pthread_create.c:463
#9 0x00007f8191a9488f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95
Thread 2 (Thread 0x7f8181f43700 (LWP 4757)):
#0 0x00007f8191a87bf9 in __GI___poll (fds=0x7f8181f42c68, nfds=1, timeout=-1)
at ../sysdeps/unix/sysv/linux/poll.c:29
#1 0x00007f8196d4e747 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2 0x00007f8196d5036a in xcb_wait_for_event () from
/usr/lib/x86_64-linux-gnu/libxcb.so.1
#3 0x00007f81844c3aa9 in QXcbEventReader::run (this=0x55c4858894b0) at
qxcbconnection.cpp:1370
#4 0x00007f81921a1b8f in QThreadPrivate::start (arg=0x55c4858894b0) at
thread/qthread_unix.cpp:376
#5 0x00007f819131a6db in start_thread (arg=0x7f8181f43700) at
pthread_create.c:463
#6 0x00007f8191a9488f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95
Thread 1 (Thread 0x7f819898c480 (LWP 4746)):
#0 0x00007f8191a8a03f in __GI___select (nfds=nfds@entry=0,
readfds=readfds@entry=0x0, writefds=writefds@entry=0x0,
exceptfds=exceptfds@entry=0x0, timeout=timeout@entry=0x7ffe055c8a50) at
../sysdeps/unix/sysv/linux/select.c:41
#1 0x00007f81844bd682 in QXcbClipboard::waitForClipboardEvent
(this=this@entry=0x55c4858980a0, win=win@entry=39845970, type=type@entry=31,
timeout=timeout@entry=5000, checkManager=checkManager@entry=false) at
qxcbclipboard.cpp:905
#2 0x00007f81844bdcff in QXcbClipboard::getSelection (this=0x55c4858980a0,
selection=1, target=target@entry=368, property=308, time=1559900,
time@entry=0) at qxcbclipboard.cpp:993
#3 0x00007f81844bfdef in QXcbClipboard::getDataInFormat (fmtAtom=368,
modeAtom=<optimized out>, this=<optimized out>)
at qxcbclipboard.cpp:978
#4 QXcbClipboardMime::retrieveData_sys (this=0x7f817c0016c0, fmt=...,
requestedType=QVariant::String) at qxcbclipboard.cpp:149
#5 0x00007f81929072a6 in QInternalMimeData::retrieveData (this=0x7f817c0016c0,
mimeType=..., type=QVariant::String) at kernel/qdnd.cpp:214
#6 0x00007f81923b0880 in QMimeDataPrivate::retrieveTypedData
(this=0x55c488d03830, format=..., type=QVariant::String)
at kernel/qmimedata.cpp:112
#7 0x00007f81923b1855 in QMimeData::text (this=this@entry=0x7f817c0016c0) at
kernel/qmimedata.cpp:400
#8 0x00007f80c5f208e0 in HistoryItem::create (data=data@entry=0x7f817c0016c0)
at ./klipper/historyitem.cpp:60
#9 0x00007f80c5f0c3d0 in Klipper::applyClipChanges
(this=this@entry=0x55c486d12640, clipData=clipData@entry=0x7f817c0016c0)
at ./klipper/klipper.cpp:609
#10 0x00007f80c5f0e6c8 in Klipper::checkClipData (this=0x55c486d12640,
selectionMode=<optimized out>) at ./klipper/klipper.cpp:743
#11 0x00007f81923b7d4f in QtPrivate::QSlotObjectBase::call (a=0x7ffe055c9050,
r=0x55c486d12640, this=0x55c486d23390)
at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:378
#12 QMetaObject::activate (sender=0x55c485e9d690, signalOffset=<optimized out>,
local_signal_index=local_signal_index@entry=0,
argv=argv@entry=0x7ffe055c9050) at kernel/qobject.cpp:3749
#13 0x00007f81923b8307 in QMetaObject::activate (sender=<optimized out>,
m=m@entry=0x7f8192f7b4e0 <QClipboard::staticMetaObject>,
local_signal_index=local_signal_index@entry=0,
argv=argv@entry=0x7ffe055c9050) at kernel/qobject.cpp:3628
#14 0x00007f8192ca012e in QClipboard::changed (this=<optimized out>,
_t1=<optimized out>) at .moc/moc_qclipboard.cpp:163
#15 0x00007f81928e4663 in QPlatformClipboard::emitChanged
(this=this@entry=0x55c4858980a0, mode=mode@entry=QClipboard::Selection)
at kernel/qplatformclipboard.cpp:125
#16 0x00007f81844bdf45 in QXcbClipboard::handleXFixesSelectionRequest
(this=0x55c4858980a0, event=event@entry=0x7f817c00b1b0)
at qxcbclipboard.cpp:737
#17 0x00007f81844c5753 in QXcbConnection::handleXcbEvent
(this=this@entry=0x55c485879100, event=event@entry=0x7f817c00b1b0)
at qxcbconnection.cpp:1181
#18 0x00007f81844c625c in QXcbConnection::processXcbEvents
(this=0x55c485879100) at qxcbconnection.cpp:1767
#19 0x00007f81923b87a2 in QObject::event (this=0x55c485879100, e=<optimized
out>) at kernel/qobject.cpp:1246
#20 0x00007f81939b45cc in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#21 0x00007f81939bbd84 in QApplication::notify(QObject*, QEvent*) () from
/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#22 0x00007f81923884f8 in QCoreApplication::notifyInternal2
(receiver=0x55c485879100, event=event@entry=0x7f817c00e220)
at kernel/qcoreapplication.cpp:1044
#23 0x00007f819238b08d in QCoreApplication::sendEvent (event=0x7f817c00e220,
receiver=<optimized out>)
at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:234
#24 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0,
event_type=event_type@entry=0, data=0x55c48585f430)
at kernel/qcoreapplication.cpp:1719
#25 0x00007f819238b618 in QCoreApplication::sendPostedEvents
(receiver=receiver@entry=0x0, event_type=event_type@entry=0)
at kernel/qcoreapplication.cpp:1573
#26 0x00007f81923e3673 in postEventSourceDispatch (s=0x55c4858c0340) at
kernel/qeventdispatcher_glib.cpp:276
#27 0x00007f818b8b0287 in g_main_context_dispatch () from
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007f818b8b04c0 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#29 0x00007f818b8b054c in g_main_context_iteration () from
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#30 0x00007f81923e2c9f in QEventDispatcherGlib::processEvents
(this=0x55c4858b8b80, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#31 0x00007f8184547fc1 in QPAEventDispatcherGlib::processEvents
(this=0x55c4858b8b80, flags=...) at qeventdispatcher_glib.cpp:69
#32 0x00007f819238673a in QEventLoop::exec (this=this@entry=0x7ffe055c9710,
flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#33 0x00007f819238f974 in QCoreApplication::exec () at
kernel/qcoreapplication.cpp:1332
#34 0x000055c48482aa78 in main (argc=<optimized out>, argv=<optimized out>) at
./shell/main.cpp:212
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