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markus.g n00b
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Posted: Tue Mar 06, 2012 8:29 pm Post subject: Dekstop Lockups in KDE-4.8.0 (dbus, polkit, udev related???) |
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Hi all!
Sometimes right after login via KDM or quite seldom during an otherwise runnig KDE session i experience some lockups of the DE up to 30 secs or so. This does not happen evertime. It seems to happen signifcantly more often if there is at least one other active KDE session (different user logged in) .
When these lookups resolve I find an error msg in .xsession-errors complaining that the message bus would not send a reply.
Actual examples are:
korgac(4856)/kdecore (K*TimeZone*): KSystemTimeZones: ktimezoned initialize() D-Bus call failed: "Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken."
akonadi_kcal_resource_2(551)/kdecore (K*TimeZone*): KSystemTimeZones: ktimezoned initialize() D-Bus call failed: "Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken."
[31424:31424:27986975229:ERROR:object_proxy.cc(239)] Failed to call method: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
"D-Bus communication error 'org.freedesktop.DBus.Error.NoReply': 'Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.'"
(There are many other dbus relates messages as well that seem not to cause the delays discussed here)
After playing around several weeks without a real result (any local knowledge of dbus and polkit is still not existing), i found a workaound:
Disabling the acl use-flag for udev seems to resolve the delays for me.
But afaik this should not be the way to go... So... any ideas about that? Could it be a polkit misconfiguration/problem (I actually never touched it)???
any hints are greatly welcome....
Thank you
markus |
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markus.g n00b
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Posted: Tue Mar 06, 2012 8:36 pm Post subject: info |
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emerge --info
Portage 2.2.0_alpha90 (default/linux/amd64/10.0, gcc-4.5.3, glibc-2.14.1-r2, 3.2.8-hope3-xw6600 x86_64)
=================================================================
System uname: Linux-3.2.8-hope3-xw6600-x86_64-Intel-R-_Xeon-R-_CPU_E5405_@_2.00GHz-with-gentoo-2.1
Timestamp of tree: Tue, 06 Mar 2012 18:30:01 +0000
app-shells/bash: 4.2_p20
dev-java/java-config: 2.1.11-r3
dev-lang/python: 2.7.2-r3, 3.2.2
dev-util/cmake: 2.8.7-r3
dev-util/pkgconfig: 0.26
sys-apps/baselayout: 2.1
sys-apps/openrc: 0.9.9.2
sys-apps/sandbox: 2.5
sys-devel/autoconf: 2.13, 2.68
sys-devel/automake: 1.9.6-r3, 1.11.3
sys-devel/binutils: 2.22-r1
sys-devel/gcc: 4.5.3-r2
sys-devel/gcc-config: 1.5.1
sys-devel/libtool: 2.4.2
sys-devel/make: 3.82-r3
sys-kernel/linux-headers: 3.2-r1 (virtual/os-headers)
sys-libs/glibc: 2.14.1-r2
Repositories: gentoo ltsp sunrise kde qt local
Installed sets: @kde, @kdebindings, @kdesdk, @system
ACCEPT_KEYWORDS="amd64 ~amd64"
ACCEPT_LICENSE="* -@EULA"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=nocona -O2 -pipe -fomit-frame-pointer"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/share/config /usr/share/gnupg/qualified.txt /var/bind /var/lib/hsqldb"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/env.d/java/ /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/php/apache2-php5.4/ext-active/ /etc/php/cgi-php5.4/ext-active/ /etc/php/cli-php5.4/ext-active/ /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c"
CXXFLAGS="-march=nocona -O2 -pipe -fomit-frame-pointer"
DISTDIR="/usr/portage/distfiles"
FEATURES="assume-digests binpkg-logs distlocks ebuild-locks fixlafiles metadata-transfer news parallel-fetch parallel-install preserve-libs protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox"
FFLAGS=""
GENTOO_MIRRORS="http://gentoo.inode.at http://distfiles.gentoo.org http://www.ibiblio.org/pub/Linux/distributions/gentoo"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
LINGUAS="en de"
MAKEOPTS="-j9"
PKGDIR="/usr/portage/packages"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/var/lib/layman/ltsp /var/lib/layman/sunrise /var/lib/layman/kde /var/lib/layman/qt /usr/local/portage/local"
SYNC="rsync://rsync.gentoo.org/gentoo-portage"
USE="3dnow X a52 aac aalib acl acpi alsa amd64 archive attica audiofile avahi bash-completion berkdb bittorrent bl bzip2 c++0x cairo caps captury cdda cddb cdparanoia chroot cli consolekit context cracklib crypt cups curl cvs cxx dbus dri dvd dvdr dvdread dvi dvipdfm egl encode exif exiv2 fbcon fbdev ffmpeg firefox flac fontconfig foomaticdb fortran ftp gallium gcj gd gdbm gif gles glib glut gnutls gpgme gpm graphviz gs gssapi gstreamer gtk guile htmlhandbook iconv icu id3 idea idn imagemagick imap immqt-bc introspection ipv6 java java6 javascript jpeg jpeg2k kde kdehiddenvisibility kerberos kpathsea kvm latex lcd lcms libkms llvm lm_sensors logrotate lua lzma mad matroska mmap mmx mng modules motif mp3 mp3rtp mp4 mpeg mpeg2 mplayer mudflap multilib mysql mysqli nas ncurses nepomuk nfs nls nptl nptlonly nsplugin objc objc++ objc-gc offensive ogg openal openexr opengl openldap openmp pam pcre pdf phonon plasma png policykit pppd ps pulseaudio python qalculate qt3support qt4 quicktime rdesktop readline sasl sdl semantic-desktop server session smp sound spell sql sqlite sse sse2 sse3 sse4_1 ssl ssse3 subversion svg symlink sysfs tcl tcpd tetex tex theora threads tiff tk tls truetype type1 udev unicode usb userlocales v4l2 vim vim-syntax vlc vnc vorbis webgl webkit wmf x264 xanim xcb xcomposite xinetd xorg xv xvid zlib" ALSA_CARDS="hda-intel" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mmap_emul mulaw multi null plug rate route share shm softvol" APACHE2_MODULES="actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="kexi words flow plan stage tables krita karbon braindump" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ubx" INPUT_DEVICES="evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LINGUAS="en de" PHP_TARGETS="php5-3" RUBY_TARGETS="ruby18" USERLAND="GNU" VIDEO_CARDS="r600 radeon fbdev vesa vga" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account"
Unset: CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS
sys-fs/udev-171-r5 was built with the following:
USE="edd extras gudev introspection keymap (multilib) rule_generator -acl -action_modeswitch -build -debug -floppy -hwdb (-selinux) -test" |
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franzf Advocate
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markus.g n00b
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Posted: Tue Mar 06, 2012 9:09 pm Post subject: |
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Thanks for pointing me to that.
The problem started quite a while before 4.8. I've indeed tried disabling all plasmoids before (not since) 4.8 wihout success, and i'm devinitly not running apper or nm, since this a workstation i a static environment even without wifi.
However I'll once more try disabling folderview and rssnow, the only plasmoids besides the "standard" panel that are currently enabled. Will post results tomorrow.
thank you
markus |
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franzf Advocate
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Posted: Tue Mar 06, 2012 9:29 pm Post subject: |
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Could you remove all your clocks, or at least disable "show events"-CheckBox in the clock settings->calendar? Do you have korganizer reminder running? -> disable it.
akonadi_kcal_resource_2
korgac
are related to korganizer and kcalendar. |
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markus.g n00b
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Posted: Wed Mar 07, 2012 7:31 am Post subject: |
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Thank you once again!
The issue is diffcult to test reliably because it is not reproducable every time. However turning off plasmoids, most kdepim related stuff, and nepomuk seems to improve the situation to some extent but does not resolve it. Some lockups and errors like this:
"D-Bus communication error 'org.freedesktop.DBus.Error.NoReply': 'Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.'"
perisist. I don't know yet what's causing that as there no more context around it in .xsession-errors.
As mentioned earlier turning on the fancy KDE(PIM) things discussed and disabling udev-acl (USE=-acl emerge -1 udev) does relsove the lockups and errors for now, but rises other (known) problems -- mostly cups and hplip related... How does this fit into the picture?
markus |
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markus.g n00b
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Posted: Wed Mar 07, 2012 8:45 am Post subject: |
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Ok, forget the udev thing.. Just had the first lockup with udev -acl in 10 days... However there were two kde sessions (different users) running and it occured in a very stripped down setup (no nepomuk, most of kdepim turned off, no fanc plasmoids...)
arghhh....
markus |
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ppurka Advocate
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Posted: Wed Mar 07, 2012 10:20 am Post subject: |
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Maybe your dbus session dies just before you have the lockups? Typically, you should have just one dbus session running per user, so it should be easy to figure out if you don't have enough dbus sessions running.
To figure it out, you can use any process viewer in "tree" view (for instance htop) so that you can clearly discern the parent dbus processes and count them. _________________ emerge --quiet redefined | E17 vids: I, II | Now using kde5 | e is unstable :-/ |
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markus.g n00b
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Posted: Thu Mar 08, 2012 9:21 pm Post subject: |
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Hi
Thanx for all the great ideas!
ppurka's point seems quite close -- considering the following observation:
I had a kde session running that experienced one of these lockups. According to w(1) this session was started at 21:19
>markus :0 21:19 ?xdm? 4:57 0.01s /bin/sh /usr/bin/startkde
After the lockup resolved, i had one dbus session for user markus listed by ps with pid 8972:
>markus 8972 0.2 0.0 22232 2976 ? Ss 21:19 0:08 /usr/bin/dbus-daemon --fork --print-pid 4 --print-address 6 --session
ok, now the interesting thing is that $ls -ld /proc/8972 showed a modification time (== process creation time ??) of 21:35...
>dr-xr-xr-x 7 markus markus 0 Mar 8 21:35 /proc/8972
This needs to be confirmed, however could ihmo mean that dbus died for some reason and was restarted at 21:35 (~about 16m after the login) maybe when the seesion resumed (??)
Will now look for any relicts of a dead dbus ...
cheers, markus
edit:
maybe my last assumtion is just completely wrong because $ps axu shows a start time of 21:19 for dbus-daemon. So maybe $ls -ld /proc/<PID> != process creation time?? |
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lamarque n00b
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Posted: Sat Mar 10, 2012 2:30 pm Post subject: |
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From message
korgac(4856)/kdecore (K*TimeZone*): KSystemTimeZones: ktimezoned initialize() D-Bus call failed: "Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken."
KSystemTimeZones is one of the kded4 modules. Probably your kded4 is frozen or died. What does the command below return:
qdbus org.kde.kded /modules/ktimezoned
if it never returns then kded4 is frozen. _________________ Lamarque V. Souza
http://www.geographicguide.com/brazil.htm
Linux User #57137 - http://counter.li.org |
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markus.g n00b
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Posted: Sat Mar 10, 2012 4:33 pm Post subject: |
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hi lamarque!
ok, as i just have a locked up session at hand, this is what i get running your test:
$ qdbus org.kde.kded /modules/ktimezoned
Error: org.freedesktop.DBus.Error.NoReply
Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
$
$ps ax | grep kded
7775 ? Sl 0:00 kdeinit4: kded4 [kdeinit]
$
$qdbus org.kde.korgac
/
/MainApplication
/ac
$
hmm... looks promising -- you could be right!!!! How can I investigate furhter?
THANK YOU!!
markus |
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lamarque n00b
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Posted: Sat Mar 10, 2012 5:44 pm Post subject: |
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Got go systemsettings -> Startup and Shutdown -> Service Manager and see if service "Time Zone" is running and marked to be auto-started. The service is the last one in the bottom section. If it is not running them start it and mark it to auto-start. _________________ Lamarque V. Souza
http://www.geographicguide.com/brazil.htm
Linux User #57137 - http://counter.li.org |
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markus.g n00b
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Posted: Sat Mar 10, 2012 6:22 pm Post subject: |
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ok, "Time Zone" is set to "use" and is running on normal working sessions, on "lockuped" sessions the "service manager" goes inactive saying "cannot contact kded".
maybe it's time to disable/enable all (most) modules listed
$ qdbus org.kde.kded
/
/KIO
/KIO/Scheduler
/Layouts
/MainApplication
/Mixers
/Mixers/0
/Mixers/0/alsa_output_pci_0000_00_1b_0_analog_stereo
/Mixers/0/alsa_output_pci_0000_80_00_1_hdmi_stereo
/Mixers/1
/Mixers/1/alsa_input_pci_0000_00_1b_0_analog_stereo
/Mixers/2
/Mixers/2/restore_sink_input_by_media_role_event
/Mixers/3
/StatusNotifierWatcher
/kbuildsycoca
/kded
/modules
/modules/StatusNotifierWatcher
/modules/device_automounter
/modules/dnssdwatcher
/modules/favicons
/modules/freespacenotifier
/modules/kcookiejar
/modules/keyboard
/modules/khotkeys
/modules/kmixd
/modules/konqy_preloader
/modules/kpasswdserver
/modules/kremotecontroldaemon
/modules/kssld
/modules/ksvnd
/modules/ktimezoned
/modules/kwrited
/modules/nepomuksearchmodule
/modules/networkstatus
/modules/powerdevil
/modules/randrmonitor
/modules/remotedirnotify
/modules/solidautoeject
/modules/statusnotifierwatcher
/org
/org/freedesktop
/org/freedesktop/PowerManagement
/org/freedesktop/PowerManagement/Inhibit
/org/kde
/org/kde/Solid
/org/kde/Solid/PowerManagement
/org/kde/Solid/PowerManagement/PolicyAgent
one by one ?? Do you see any high grade suspects ??
THANK YOU!!
markus |
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markus.g n00b
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Posted: Sun Mar 11, 2012 12:27 pm Post subject: |
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yess, not too many debugging symbols, but nevertheless i, got a little bit of a backtrace by attaching gbd to a sleeping (blocked) kdeinit kded process:
$gdb kdeinit4 `pidof kded4`
<no debuging ... snip>
0x00007faa9da083b2 in ppoll () from /lib64/libc.so.6
(gdb) bt
#0 0x00007faa9da083b2 in ppoll () from /lib64/libc.so.6
#1 0x00007faa8dc75c8c in pa_mainloop_poll () from /usr/lib64/libpulse.so.0
#2 0x00007faa8dc76245 in pa_mainloop_iterate () from /usr/lib64/libpulse.so.0
#3 0x00007faa7a6d8043 in ?? () from /usr/lib64/kde4/kded_kmixd.so
#4 0x00007faa7a6d8531 in ?? () from /usr/lib64/kde4/kded_kmixd.so
#5 0x00007faa7a6e4ec7 in ?? () from /usr/lib64/kde4/kded_kmixd.so
#6 0x00007faa7a6ea698 in ?? () from /usr/lib64/kde4/kded_kmixd.so
#7 0x00007faa7a6eb178 in ?? () from /usr/lib64/kde4/kded_kmixd.so
#8 0x00007faa7a6e3644 in ?? () from /usr/lib64/kde4/kded_kmixd.so
#9 0x00007faa7a6e401f in QObject* KPluginFactory::createInstance<KMixD, QObject>(QWidget*, QObject*, QList<QVariant> const&) () from /usr/lib64/kde4/kded_kmixd.so
#10 0x00007faa9f52502b in KPluginFactory::create(char const*, QWidget*, QObject*, QList<QVariant> const&, QString const&) () from /usr/lib64/libkdecore.so.5
#11 0x00007faa8ad5033f in ?? () from /usr/lib64/libkdeinit4_kded4.so
#12 0x00007faa8ad51034 in ?? () from /usr/lib64/libkdeinit4_kded4.so
#13 0x00007faa8ad537a7 in ?? () from /usr/lib64/libkdeinit4_kded4.so
#14 0x00007faa8ad538f3 in ?? () from /usr/lib64/libkdeinit4_kded4.so
#15 0x00007faa9bdb14e4 in ?? () from /usr/lib64/qt4/libQtDBus.so.4
#16 0x00007faa9bdb252a in ?? () from /usr/lib64/qt4/libQtDBus.so.4
#17 0x00007faa9bdb2de1 in ?? () from /usr/lib64/qt4/libQtDBus.so.4
#18 0x00007faa9bdb2fe1 in ?? () from /usr/lib64/qt4/libQtDBus.so.4
#19 0x00007faa9efd0edd in QObject::event(QEvent*) () from /usr/lib64/qt4/libQtCore.so.4
#20 0x00007faa9e19ee50 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#21 0x00007faa9e1a3591 in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#22 0x00007faa9fd6aed0 in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#23 0x00007faa9efbe342 in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/qt4/libQtCore.so.4
#24 0x00007faa9efc11eb in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib64/qt4/libQtCore.so.4
#25 0x00007faa9efe900e in ?? () from /usr/lib64/qt4/libQtCore.so.4
#26 0x00007faa9a9bb032 in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#27 0x00007faa9a9bb778 in ?? () from /usr/lib64/libglib-2.0.so.0
#28 0x00007faa9a9bb934 in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#29 0x00007faa9efe9134 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#30 0x00007faa9e236b0a in ?? () from /usr/lib64/qt4/libQtGui.so.4
#31 0x00007faa9efbd558 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#32 0x00007faa9efbd7b9 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#33 0x00007faa9efc1531 in QCoreApplication::exec() () from /usr/lib64/qt4/libQtCore.so.4
#34 0x00007faa8ad4fa9f in kdemain () from /usr/lib64/libkdeinit4_kded4.so
#35 0x00000000004071d3 in _start ()
The above suggests kmix and especially its pulseaudio component being the culprit. And indeed "#USE=-pulseaudio emerge -1 kmix" has resolved most of the lockups for now. This of course is a workaround.
There is still an issue with kdepim/kwallet enabled accounts where users are asked to enter a password for a wallet containing credentials for akonadi resources. These accounts suffer from lockups lasting up to a minute or so right before the password prompt. However these lockups resolve and do not leave kded sleeping. These lockups still cause
"D-Bus communication error 'org.freedesktop.DBus.Error.NoReply': 'Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.'"
messages without further context. All time zone related stuff is gone now.
I'm glad the problem seems fixed for most my needs now, however i'm disappointed by the "lockup enabled design" of kded (kde?). Maybe this is not kde's fault (maybe i have just messed up pulseaudio) but imho this should not lockup a desktop.
Thanks for all the answers, i will have a look at pluseaudio as time permits.
markus |
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Asmodean n00b
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Posted: Tue May 22, 2012 12:45 am Post subject: |
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Hi,
i just stumbled over the same problem.
My fix: Rename (or remove) the $HOME/.pulse folder.
After that, everything works just fine again ![Smile :-)](images/smiles/icon_smile.gif) |
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equaeghe l33t
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Joined: 22 Feb 2005 Posts: 637
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Posted: Wed Jul 18, 2012 7:55 am Post subject: |
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lamarque wrote: | Got go systemsettings -> Startup and Shutdown -> Service Manager and see if service "Time Zone" is running and marked to be auto-started. The service is the last one in the bottom section. If it is not running them start it and mark it to auto-start. |
I get the same error message as the OP (I'm on KDE4.8.3 on mostly stable amd64), but everytime I start Krusader (possibly it also bugs other applications, but I haven't tested anything else yet). But, the whole Service Manager screen is grayed out for me, and I get the message that KDED could not be contacted. I have one process, kded4, that seems related.
I would be very grateful if somebody could help me get this fixed. I suppose it's a misconfiguration of sorts, because my machine at home seems unaffected (mostly the same installation, although on a different machine).
Erik
P.S.: I tried deleting ~/.pulse, but that didn't seem to help. |
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sidamos Apprentice
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Joined: 16 Dec 2007 Posts: 240
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Posted: Sun Dec 09, 2012 12:46 pm Post subject: |
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I have a similar problem with KDE 4.9.3. I do not have the .pulse directory. After booting, everything works for a while and then the problem happens. |
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Ricki n00b
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Joined: 13 Apr 2007 Posts: 4
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Posted: Sat Nov 16, 2013 10:32 am Post subject: |
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Bumping this thread again. I just installed this week KDE 4.11.3 and this issue started happening to me too. Does anyone have any idea how to solve it? |
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