Stuck and 100% CPU usage

[Roman Yepishev]

After ubuntu-sso-client is queried by ubuntuone-preferences it enters a non-responsive (dbus) state and causes 100% CPU usage.

The attempt to bt the running instance ended up with:

(gdb) bt
#0 0x00007ffff7bcdb80 in __read_nocancel () from /lib/libpthread.so.0
#1 0x00007ffff4ed2953 in ?? () from /usr/lib/pymodules/python2.6/gtk-2.0/gtk/_gtk.so
#2 0x00007ffff5867fea in g_main_context_check () from /lib/libglib-2.0.so.0
#3 0x00007ffff58689a3 in ?? () from /lib/libglib-2.0.so.0
#4 0x00007ffff5869135 in g_main_loop_run () from /lib/libglib-2.0.so.0
#5 0x00007ffff48198f7 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#6 0x00007ffff4ed2852 in ?? () from /usr/lib/pymodules/python2.6/gtk-2.0/gtk/_gtk.so
#7 0x00000000004a5298 in PyEval_EvalFrameEx ()
#8 0x00000000004a6b81 in PyEval_EvalCodeEx ()
#9 0x00000000004a4d09 in PyEval_EvalFrameEx ()
#10 0x00000000004a5a60 in PyEval_EvalFrameEx ()
#11 0x00000000004a6b81 in PyEval_EvalCodeEx ()
#12 0x00000000004a6c52 in PyEval_EvalCode ()
#13 0x00000000004c6fce in PyRun_FileExFlags ()
#14 0x00000000004c71e4 in PyRun_SimpleFileExFlags ()
#15 0x00000000004180c1 in Py_Main ()
#16 0x00007ffff69d2d8d in __libc_start_main () from /lib/libc.so.6
#17 0x00000000004172c9 in _start ()

[Natalia Bidart (nataliabidart)]

I could also reproduce this by starting the login process from syncdaemon and canceling it.

[Alejandro J. Cura (alecu)]

This seems related to the webkit instance that's embeded for the terms and conditions dialog.
When calling the dbus interface with a dummy terms and conditions url, the cpu usage stayed low; if called with the real url "https://one.ubuntu.com/terms", the cpu is maxed out.

I suggest the webkit widget should only be instanciated while showing the terms and conditions, and it should be destroyed after the user clicks on the "Back" button in the dialog.

[Roman Yepishev (rye)]

Better traceback from gdb with python-dbg installed:

This happens even if no GUI is instantiated, so webkit may not be guilty.

#0 0x00007ffff6a8e1a8 in poll () from /lib/libc.so.6
#1 0x00007ffff5868979 in ?? () from /lib/libglib-2.0.so.0
#2 0x00007ffff5869125 in g_main_loop_run () from /lib/libglib-2.0.so.0
#3 0x00007ffff4818a47 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#4 0x00007ffff4ed2852 in ?? () from /usr/lib/pymodules/python2.6/gtk-2.0/gtk/_gtk.so
#5 0x00000000004a52e8 in call_function (f=
    Frame 0x1635b00, for file /usr/lib/python2.6/dist-packages/twisted/internet/gtk2reactor.py, line 270, in run (self=<Gtk2Reactor(waker=<_UnixWaker(i=9, fileno=<function at remote 0x12c8de8>, reactor=<...>, o=10) at remote 0x15e1d10>, threadCallQueue=[], _cancellations=0, _sources={<...>: 5}, _justStopped=False, _newTimedCalls=[], _pendingTimedCalls=[], _Gtk2Reactor__iteration=<built-in function main_iteration>, _internalReaders=set([<...>]), _started=True, _simtag=260, _Gtk2Reactor__run=<built-in function main>, usingThreads=True, _eventTriggers={'startup': <_ThreePhaseEvent(during=[], state='BASE', after=[], finishedBefore=[], before=[]) at remote 0x15e1c50>, 'shutdown': <_ThreePhaseEvent(during=[(<instancemethod at remote 0x1008e60>, (), {}), (<instancemethod at remote 0x1008eb0>, (...), {})], state='BASE', after=[], before=[]) at remote 0x15e1c90>}, _installSignalHandlers=1, _Gtk2Reactor__pending=<built-in function events_pending>, running=True, resolver=<ThreadedResolver(_runningQueries={}, reactor=<...>) ...(truncated), throwflag=<value optimized out>)
    at ../Python/ceval.c:3734
#6 PyEval_EvalFrameEx (f=
    Frame 0x1635b00, for file /usr/lib/python2.6/dist-packages/twisted/internet/gtk2reactor.py, line 270, in run (self=<Gtk2Reactor(waker=<_UnixWaker(i=9, fileno=<function at remote 0x12c8de8>, reactor=<...>, o=10) at remote 0x15e1d10>, threadCallQueue=[], _cancellations=0, _sources={<...>: 5}, _justStopped=False, _newTimedCalls=[], _pendingTimedCalls=[], _Gtk2Reactor__iteration=<built-in function main_iteration>, _internalReaders=set([<...>]), _started=True, _simtag=260, _Gtk2Reactor__run=<built-in function main>, usingThreads=True, _eventTriggers={'startup': <_ThreePhaseEvent(during=[], state='BASE', after=[], finishedBefore=[], before=[]) at remote 0x15e1c50>, 'shutdown': <_ThreePhaseEvent(during=[(<instancemethod at remote 0x1008e60>, (), {}), (<instancemethod at remote 0x1008eb0>, (...), {})], state='BASE', after=[], before=[]) at remote 0x15e1c90>}, _installSignalHandlers=1, _Gtk2Reactor__pending=<built-in function events_pending>, running=True, resolver=<ThreadedResolver(_runningQueries={}, reactor=<...>) ...(truncated), throwflag=<value optimized out>)
    at ../Python/ceval.c:2412
#7 0x00000000004a6bd1 in PyEval_EvalCodeEx (co=0x12c86c0, globals=<value optimized out>, locals=<value optimized out>, args=0x2,
    argcount=<value optimized out>, kws=<value optimized out>, kwcount=0, defs=0x13c8d28, defcount=1, closure=0x0) at ../Python/ceval.c:3000
#8 0x00000000004a4d59 in fast_function (f=
    Frame 0x1633560, for file /usr/lib/ubuntu-sso-client/ubuntu-sso-login, line 221, in main (self=<LoginMain(_LoginMain__bus=<...

[Launchpad Janitor (janitor)]

This bug was fixed in the package ubuntu-sso-client - 0.99.1-0ubuntu1

---------------
ubuntu-sso-client (0.99.1-0ubuntu1) maverick; urgency=low

  * New upstream release:
    - Delayed opening the webkit browser to the latest possible. (LP: #617041)
    (nataliabidart)
    - Use a proper dictionary with different attributes for each key so old
    keys are not overwritten nor deleted. (LP: #617347) (alecu)
 -- Natalia Bidart (nessita) <email address hidden> Thu, 19 Aug 2010 13:02:10 -0300

[Doug McMahon (mc3man)]

See absolutely no change after installing 0.99.1-0ubuntu1, cpu usage goes to 100% and stays there till the process is killed or logging out of session.

[Natalia Bidart (nataliabidart)]

Doug,

We know we haven't solved the issue, we just delayed the browser opening until the latest possible.
Could you please detail what steps are you following to make the cpu goes to 100%?

Thanks!

[Doug McMahon (mc3man)]

Naty Bidart wrote >
We know we haven't solved the issue, we just delayed the browser opening until the latest possible.

Simply by just opening the ubuntu one preferences. If ubuntu one is set to start up on boot then cpu use is fine, ie. it connects and syncs.
It's only when the preferences is opened that the issue then occurs (whether set to run at boot or not

[Natalia Bidart (nataliabidart)]

Current code in ubuntu-sso-client provides the two servies (old and new). Since ubuntuone-preferences uses the old service, we'd re analize this bug after removing the old service.

[Doug McMahon (mc3man)]

The update of ubuntuone* (1.3.90-0ubuntu1) tonight resolved the cpu issue here - two separate installs

[Tim Cuthbertson (ratcheer)]

Today's ubuntuone* 1.3.90-9 updates fixed the problem for me, as well.

Thank you, Tim

[Natalia Bidart (nataliabidart)]

Confirmed is still happening with ubuntu-sso-client v 0.99.4, when browsing the terms and conditions.