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List:       kde-bugs-dist
Subject:    [plasmashell] [Bug 353072] New: Touchpad kded module hogs CPU
From:       Ralf Jung <post () ralfj ! de>
Date:       2015-09-23 7:48:41
Message-ID: bug-353072-17878 () http ! bugs ! kde ! org/
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https://bugs.kde.org/show_bug.cgi?id=353072

            Bug ID: 353072
           Summary: Touchpad kded module hogs CPU
           Product: plasmashell
           Version: 5.4.1
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kde@davidedmundson.co.uk
          Reporter: post@ralfj.de
                CC: bhush94@gmail.com, plasma-bugs@kde.org

I currently have a kded5 process using one CPU core full-time for almost two
hours.

Attaching gdb to it shows:

Thread 2 (Thread 0x7f0bfb7fe700 (LWP 15144)):
#0  0x00007f0c1c14652d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f0c064156b1 in poll (__timeout=-1, __nfds=1, __fds=0x7f0bec026cf0)
at /usr/include/x86_64-linux-gnu/bits/poll2.h:46
#2  poll_func (ufds=0x7f0bec026cf0, nfds=1, timeout=-1,
userdata=0x7f0bf4048c40) at pulse/thread-mainloop.c:69
#3  0x00007f0c06406db1 in pa_mainloop_poll (m=m@entry=0x7f0bf4048b40) at
pulse/mainloop.c:844
#4  0x00007f0c0640744e in pa_mainloop_iterate (m=0x7f0bf4048b40,
block=<optimized out>, retval=0x0) at pulse/mainloop.c:926
#5  0x00007f0c06407500 in pa_mainloop_run (m=0x7f0bf4048b40,
retval=retval@entry=0x0) at pulse/mainloop.c:944
#6  0x00007f0c06415646 in thread (userdata=0x7f0bf4048b00) at
pulse/thread-mainloop.c:88
#7  0x00007f0c05962978 in internal_thread_func (userdata=0x7f0bf4048cf0) at
pulsecore/thread-posix.c:81
#8  0x00007f0c19ec20a4 in start_thread (arg=0x7f0bfb7fe700) at
pthread_create.c:309
#9  0x00007f0c1c14f06d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7f0c1c6ec8c0 (LWP 9316)):
#0  XRecordKeyboardMonitor::processNextReply (this=0x14b5d90) at
../../../../kcms/touchpad/src/backends/x11/xrecordkeyboardmonitor.cpp:98
#1  0x00007f0c1a7067ba in QMetaObject::activate (sender=sender@entry=0x14b5ef0,
signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0,
argv=argv@entry=0x7fff56f77eb0) at kernel/qobject.cpp:3718
#2  0x00007f0c1a706fb7 in QMetaObject::activate (sender=sender@entry=0x14b5ef0,
m=m@entry=0x7f0c1a9206e0 <QSocketNotifier::staticMetaObject>,
local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fff56f77eb0)
    at kernel/qobject.cpp:3583
#3  0x00007f0c1a785a0e in QSocketNotifier::activated
(this=this@entry=0x14b5ef0, _t1=10) at .moc/moc_qsocketnotifier.cpp:134
#4  0x00007f0c1a712c9b in QSocketNotifier::event (this=0x14b5ef0, e=<optimized
out>) at kernel/qsocketnotifier.cpp:296
#5  0x00007f0c1bb369fc in QApplicationPrivate::notify_helper
(this=this@entry=0x139f750, receiver=receiver@entry=0x14b5ef0,
e=e@entry=0x7fff56f78120) at kernel/qapplication.cpp:3717
#6  0x00007f0c1bb3bec6 in QApplication::notify (this=0x7fff56f78410,
receiver=0x14b5ef0, e=0x7fff56f78120) at kernel/qapplication.cpp:3500
#7  0x00007f0c1a6d7c7b in QCoreApplication::notifyInternal
(this=0x7fff56f78410, receiver=0x14b5ef0, event=event@entry=0x7fff56f78120) at
kernel/qcoreapplication.cpp:965
#8  0x00007f0c1a72e8fd in QCoreApplication::sendEvent (event=0x7fff56f78120,
receiver=<optimized out>) at
../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:224
#9  socketNotifierSourceDispatch (source=0x13eb890) at
kernel/qeventdispatcher_glib.cpp:101
#10 0x00007f0c199a2c3d in g_main_context_dispatch () from
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007f0c199a2f20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#12 0x00007f0c199a2fcc in g_main_context_iteration () from
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#13 0x00007f0c1a72e44b in QEventDispatcherGlib::processEvents (this=0x13e9780,
flags=...) at kernel/qeventdispatcher_glib.cpp:420
#14 0x00007f0c1a6d540a in QEventLoop::exec (this=this@entry=0x7fff56f78330,
flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#15 0x00007f0c1a6dd4cc in QCoreApplication::exec () at
kernel/qcoreapplication.cpp:1229
#16 0x00007f0c1c41f297 in kdemain () from
/usr/lib/x86_64-linux-gnu/libkdeinit5_kded5.so
#17 0x00007f0c1c08ab45 in __libc_start_main (main=0x400720 <main>, argc=1,
argv=0x7fff56f78578, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7fff56f78568) at libc-start.c:287
#18 0x000000000040074e in _start ()

This is confirmed by "sudo perf top":

  24.73%  kded_touchpad.so                         [.] 0x0000000000033df4
  18.79%  libxcb.so.1.1.0                          [.] xcb_poll_for_reply
  12.24%  kded_touchpad.so                         [.] 0x0000000000033dec


Reproducible: Didn't try




This is probably the wrong product, but I had no idea what "kded_touchpad.so"
belongs to. It is packaged as part of plasma-desktop in Debian, so I figured
this may be a good place to start.

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