[Not sure of the protocol here: should I have posted to Bug 690? or
sent this email?]
3.5.13 kdm_greet eats lots of CPU.
I see this was marked as fixed (Bug 690) and looking at the source of
Slavek's kdm-trinity, I'm using his ppa on wheezy so the version of
kdm-trinity installed is 4:3.5.13-2debian0~pre26+7~wheezy, the patches
for kgreeter.cpp and sakdlg.cc are in place... but the bug's still
there.
It seems worse when a remote display connects but also happens with just
a display on the machine's console.
This is happening on my little laptop test mule (Intel Core 2) and a
larger 16 core server (AMD Opteron).
A few observations:
/tmp/ksocket-global exists and is mode 0644. Curiously it's owned by
what appears to be a random user-id. If I stop kdm, remove the
/tmp/ksocket-global directory and restart kdm it recreates
ksocket-global mode 0644 but owned by user id 1000... as that's the uid
for the kdm_greet process (eh? why is kdm_greet changing its process
uid? kdm is running as root. can't even see setuid being used in the
kfrontend code).
/tmp/ksocket-global is an empty directory.
An strace on kdm_greet shows the following loop:
read(-1, 0xbfcdd300, 2048) = -1 EBADF (Bad file descriptor)
recv(4, 0x993e5f0, 4096, 0) = -1 EAGAIN (Resource temporarily unavailable)
nanosleep({0, 500000}, NULL) = 0
gettimeofday({1358766636, 578738}, NULL) = 0
recv(4, 0x993e5f0, 4096, 0) = -1 EAGAIN (Resource temporarily unavailable)
gettimeofday({1358766636, 578825}, NULL) = 0
select(9, [4 5 8], [], [], {0, 0}) = 0 (Timeout)
gettimeofday({1358766636, 578940}, NULL) = 0
read(-1, 0xbfcdd300, 2048) = -1 EBADF (Bad file descriptor)
The read from -1 is obviously wrong.
/var/log/kdm.log contains errors as follows:
>Jan 21 11:17:52 kdm_config[30569] info: Cannot open master configuration file /etc/trinity/kdm/kdmdistrc
<fair enough: it doesn't exist>
>
>X.Org X Server 1.12.4
>Release Date: 2012-08-27
>X Protocol Version 11, Revision 0
>Build Operating System: Linux 2.6.32-5-amd64 i686 Debian
>Current Operating System: Linux lapcat 3.2.32lls-rt48 #2 SMP Wed Dec 12
>10:32:35 GMT 2012 i686
>Kernel command line: BOOT_IMAGE=Linux ro
>root=UUID=7b9e9723-c08f-426c-96a6-4ad9aeee1e5d
>Build Date: 29 November 2012 08:52:43PM
>xorg-server 2:1.12.4-4 (Julien Cristau <jcristau@...>)
>Current version of pixman: 0.26.0
> Before reporting problems, check http://wiki.x.org
> to make sure that you have the latest version.
>Markers: (--) probed, (**) from config file, (==) default setting,
> (++) from command line, (!!) notice, (II) informational,
> (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
>(==) Log file: "/var/log/Xorg.0.log", Time: Mon Jan 21 11:17:52 2013
>(==) Using system config directory "/usr/share/X11/xorg.conf.d"
>(II) [KMS] Kernel modesetting enabled.
>QWidget::setMinimumSize: The smallest allowed size is (0,0)
>QWidget::setMaximumSize: (unnamed/QDialog) Negative sizes (-1,-1) are not possible
>sh: warning: setlocale: LC_ALL: cannot change locale (en_GB)
>QSettings::sync: failed to open '/etc/qt3/qt_plugins_3.3rc.tmp' for writing
This file does exist mode 0644 uid root, gid root.
/etc/qt3 is mode 0755, root.root
/etc is 0711, root.root
>QSettings: error creating /tmp/1468675921/.qt
/tmp/1468675921/.qt does exist. Mode 0775, root.root. Nothing in
there though.
>QSettings::sync: failed to open '/etc/qt3/qt_plugins_3.3rc.tmp' for writing
>QSettings: error creating /tmp/1468675921/.qt
>QSettings::sync: failed to open '/etc/qt3/qt_plugins_3.3rc.tmp' for writing
>QSettings: error creating /tmp/1468675921/.qt
>QSettings::sync: failed to open '/etc/qt3/qt_plugins_3.3rc.tmp' for writing
>QSettings: error creating /tmp/1468675921/.qt
>QSettings::sync: failed to open '/etc/qt3/qt_plugins_3.3rc.tmp' for writing
>QSettings: error creating /tmp/1468675921/.qt
>QSettings::sync: failed to open '/etc/qt3/qt_plugins_3.3rc.tmp' for writing
>QSettings: error creating /tmp/1468675921/.qt
>QSettings::sync: failed to open '/etc/qt3/qt_plugins_3.3rc.tmp' for writing
I'm very happy to test/debug/try code.
Original Bug Ref: http://bugs.trinitydesktop.org/bugzilla/show_bug.cgi?id=690
--
Regards,
Russell
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