dbus daemon/messagebus 100% CPU usage

[David Hopkins]

It appears that the issue is related to this bug:

https://bugs.launchpad.net/ubuntu/+source/dbus/+bug/381063

So, how do I set ulimit -n 8192

for example to increase the open files limit?  Do I need to edit the
/etc/init/dbus.conf file and add this command somewhere? Or is there
some other location that I can make certain that the limit is changed
from 1024 to a larger number?

I would think this bug would affect more than just me as it seems to
be an issue for ltsp in general.

Sincerely,
Dave Hopkins


On Thu, Sep 16, 2010 at 1:42 PM, David Hopkins <dahopkins429 at gmail.com> wrote:
> Jordan,
>
> Thanks for the link but I don't think it is that issue as I'm not
> getting error messages in the log files.  Running dpkg
> --get-selections shows that the two systems have exactly the same
> packages installed.  I have between 40 and 50 users logged onto the
> server at any given time.  It is rather random as the system can run
> fine for a day or so and then suddenly have this issue.
>
> I have already rebuilt the server once a few weeks ago. That was when
> I made certain that is was a 'clone' of the other server.  I used the
> --get-selections and --set-selections to ensure that apt installed
> only those packages.
>
> The only clue I have at present is that npviewer.bin (flash?) will
> segfault at times though the system doesn't misbehave when this
> happens. It is probably just one line in a log file that I haven't
> located which the clue I need, but if I can't resolve it quickly, I'll
> probably have to try upgrading the systems to Lucid (10.04) although
> from some traffic on the lists, it seems lucid comes with its own set
> of issues.
>
> Thanks!
> Dave ...
>
> On Thu, Sep 16, 2010 at 11:24 AM, Jordan Erickson
> <jerickson at logicalnetworking.net> wrote:
>> Hi David,
>>
>> If 1 of 2 servers is experiencing this issue, and nobody else has chimed
>> in yet to say they're having the same problem, I'd have to assume it's
>> something very particular to your one server's setup.. A couple of
>> questions:
>>
>> - Is this happening with specific users, only before/after login, ...?
>> - Have you checked logs on the terminals themselves?
>> - Just a shot in the dark (google in the dark?) but have you seen
>> comments 11 & 12 at
>> https://bugs.launchpad.net/debian/+source/pulseaudio/+bug/390528 ?
>>
>> I'm sure there's a solution to your problem. The important thing IMHO is
>> to do as much research on your issue as possible and not let the school
>> director think that it's unsolvable. Worst case scenario you could
>> always wipe/re-install the system. Going back to an unsupported LTSP 4.2
>> probably isn't your best option.
>>
>>
>> Cheers,
>> Jordan
>>
>>
>> On 09/16/2010 05:12 AM, David Hopkins wrote:
>>> I am still having issues with the dbus-daemon randomly consuming 100%
>>> of the cpu on my servers which renders them unusable.  There doesn't
>>> appear to be any messages in the logs but the school director has now
>>> stopped by and asked if it wouldn't be simpler to go back to the RHEL5
>>> with LTSP4.2 instead of staying with Ubuntu.  He is very supportive of
>>> using LTSP and for him to ask this is a serious concern.
>>>
>>> Does anyone have any ideas about why the dbus-daemon would suddenly
>>> spike to 100% cpu usage and hang the system?  The load average can be
>>> very low (4-5 on a dual-quad) and yet the system is completely
>>> nonresponsive?
>>>
>>> Sincerely,
>>> Dave Hopkins
>>>
>>>
>>> On Thu, Sep 9, 2010 at 3:01 PM, David Hopkins <dahopkins429 at gmail.com> wrote:
>>>> Has anyone noticed dbus (messagebus) using 100% of a CPU on an LTSP
>>>> server?  I have two identical servers both hardware and software
>>>> (Karmic 9.10, comparing output from dpkg --get-selections). However,
>>>> one server runs flawlessly, the other shows dbus_daemon using 100% of
>>>> a CPU. Also, memory usage slowly climbs until the system begins using
>>>> virtual memory and everything then comes to a halt.  Both systems
>>>> connect to the same brand of switch, both connect to a KVM.  The only
>>>> differences are in the client systems that they serve. One servers
>>>> GX150/GX240s while the other (the misbehaving system) serves
>>>> GX50/GX110/GX150's.  I'm in the process of replacing the GX50 systems
>>>> and as many GX110's as possible, but curious if anyone has noticed
>>>> this issue.
>>>>
>>>> Sincerely,
>>>> Dave Hopkins
>>>> Newark Charter School
>>>> Newark Delaware
>>>>
>>>
>>
>>
>> --
>> Jordan Erickson - LNS
>> (707) 636-5678  - http://logicalnetworking.net
>>
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>