https://bugs.kde.org/show_bug.cgi?id=366742
--- Comment #5 from Tony <jodr...@live.com> ---
Ok, i gave it another try. Had to read about gdb a bit.... The desktop still
locks while using gdb though so here is what i did:
First i delete .config and .cache from "home" and start the desktop clean.
I login to VT3 and VT4. In VT4 have top running, VT3 i used it to run gdb.
So i opened 4 torrents with qbitorrent switch to VT4 check that X and kwin are
using a lot cpu power.
Switch to VT3 and ran gdb, set logging on, and ran bt. I got this on from
"gdb.txt" on my home folder:
#0 QVector<bool (*)(QXcbConnection*, xcb_generic_event_t*)>::detach
(this=0x1470800) at
../../../../include/QtCore/../../src/corelib/tools/qvector.h:384
#1 QVector<bool (*)(QXcbConnection*, xcb_generic_event_t*)>::end
(this=0x1470800) at
../../../../include/QtCore/../../src/corelib/tools/qvector.h:208
#2 QXcbConnection::processXcbEvents (this=0x14704f0) at
qxcbconnection.cpp:1731
#3 0x00007f54ce159ad9 in QObject::event (this=0x14704f0, e=<optimized out>) at
kernel/qobject.cpp:1263
#4 0x00007f54cea1989c in QApplicationPrivate::notify_helper (this=<optimized
out>, receiver=0x14704f0, e=0x7f54b4a5aef0) at kernel/qapplication.cpp:3799
#5 0x00007f54cea21296 in QApplication::notify (this=0x7ffc2242e190,
receiver=0x14704f0, e=0x7f54b4a5aef0) at kernel/qapplication.cpp:3556
#6 0x00007f54ce12dda8 in QCoreApplication::notifyInternal2
(receiver=0x14704f0, event=event@entry=0x7f54b4a5aef0) at
kernel/qcoreapplication.cpp:988
#7 0x00007f54ce13046b in QCoreApplication::sendEvent (event=0x7f54b4a5aef0,
receiver=<optimized out>)
at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#8 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0,
event_type=event_type@entry=0, data=0x1456d30) at
kernel/qcoreapplication.cpp:1649
#9 0x00007f54ce17ddea in QEventDispatcherUNIX::processEvents (this=0x14abdf0,
flags=flags@entry=...) at kernel/qeventdispatcher_unix.cpp:461
#10 0x00007f54ba3b287d in QUnixEventDispatcherQPA::processEvents
(this=<optimized out>, flags=...) at
eventdispatchers/qunixeventdispatcher.cpp:68
#11 0x00007f54ce12bd9a in QEventLoop::exec (this=this@entry=0x7ffc2242e080,
flags=..., flags@entry=...) at kernel/qeventloop.cpp:210
#12 0x00007f54ce1343ac in QCoreApplication::exec () at
kernel/qcoreapplication.cpp:1261
#13 0x00007f54ce476dbc in QGuiApplication::exec () at
kernel/qguiapplication.cpp:1639
#14 0x00007f54cea197f5 in QApplication::exec () at kernel/qapplication.cpp:2975
#15 0x00007f54d0588206 in kdemain (argc=1, argv=0x7ffc2242e318) at
/workspace/build/main_x11.cpp:466
#16 0x00007f54d01cf830 in __libc_start_main (main=0x400710 <main(int, char**)>,
argc=3, argv=0x7ffc2242e318, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7ffc2242e308) at
../csu/libc-start.c:291
#17 0x0000000000400749 in _start ()
Detaching from program: /usr/bin/kwin_x11, process 10843
Hopefully it helps.
But now i noticed something else, when i ran gdb attached to kwin process the
cpu usage from both X and kwin goes down right away, but as soon as i quit it
it goes up again. Both spike well above 50% cpu usage on a FX832 up to 90% for
X and stay there until i killed qbittorrent.
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