I have run into this issue. Also when using Thunderbird. I thought it
was the 14 to 15 Thunderbird upgrade in 12.04 since the problem started
basically overnight, and coincidentally after the 14 to 15 Thunderbird
upgrade. I was pulling my hair out since Thunderbird was basically
unusable -- it would run normally but pause for a few seconds after
opening a new message, deleting messages, or just clicking to select
messages. It would also pause while writing a new message, so whatever
you typed didn't show up right away but instead be displayed all of the
sudden a few seconds later. Totally annoying.
Another symptom was Unity dimming the Thunderbird window at some points
because it thought that TB was unresponsive (hung), though it would
undim it a few seconds later -- I would notice this behavior when TB
initially ran and it was establishing the connection to my IMAP server.
I would also notice this same behavior at some other times, like opening
a new message, though these were rare.
I downgraded to TB 14 and it didn't help. I ran TB without extensions;
in safe mode, etc. to no avail. It was completely puzzling because I had
not been having this problem before.
Running strace on the Thunderbird executable revealed one of the same
symptoms mentioned by people above, i.e. lots of these:
sendmsg(38, {msg_name(0)=NULL,
msg_iov(2)=[{"l\4\1\1\24\1\0\0002\304\23\0x\0\0\0\1\1o\0\25\0\0\0/org/a11"...,
136}, {"\5\0\0\0:1.48\0\0\0!\0\0\0/org/a11y/atspi/"..., 276}],
msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 412
Then, somehow I found this bug and confirmed in top that each time I had
a pause, both thunderbird and dbus-daemon would be hogging the CPU. I
did notice that the dbus-daemon that was hogging the CPU was not the
system DBus daemon, but one associated with at-spi2 (accessability).
Fortunately, I don't need accessability features, so I looked for ways
to prevent all the at-spi2 stuff from auto-starting upon logging into my
Unity session to see if that fixed the problem I was having with
Thunderbird. Turns out that in Ubuntu 12.04 you can disable at-spi2 by
using gsettings like this:
shell$ gsettings set org.gnome.desktop.interface toolkit-accessibility
false
After logging out and logging back in, the at-spi2 processes were not
running. I then fired up Thunderbird and the problem was completely
gone. In fact, Thunderbird feels now a lot snappier -- everything
(opening messages, deleting messages, replying, etc.) seems faster. But,
the most important thing is that the annoying pauses/temporary freezes
seem to be completely gone.
What is very puzzling is that this problem happened overnight for me. I
could have been an unrelated 12.04 package update, but if that is the
case, I don't know what package it was. In any case, if you end up
reading this bug, and your symptoms are similar to the ones described
here then try disabling at-spi2.
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/680444
Title:
dbus-daemon eats 100% cpu and is not responsive
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/dbus/+bug/680444/+subscriptions
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
