xfs blocks (blocked for more than 120 seconds)

[Michel Verbraak(1st-Setup)]

op 24-03-14 14:27, Mark Tinguely schreef:
> On 03/24/14 04:24, Michel Verbraak(1st-Setup) wrote:
>> Hi,
>>
>> We have a problem with one of our systems which is using XFS but we are
>> unable to find the problem. Recently we had two moments, Tuesday 4th of
>> March and Friday the 21st of March, where we had to reboot the system to
>> get it up and running again.
>>
>> What happens:
>> - The programs handling files on the XFS disc stop working when
>> creating, deleting or writing files. They do not error they are just
>> waiting on the command to complete.
>> - One of our programs, a java application, goes into very high cpu usage
>> (50%) which normally is at 1%. This could be something in our java
>> application but it happens at the moment handling files gets stuck.
>> - A nice restart of the programs does not succeed as wel a kill -9 does
>> not work.
>> - Trying to reboot the servers in a normal fashion does not work. As it
>> is a virtual machine we have to do a shutdown (unplug power) and start
>> it up again to get it up and running.
>>
>> Following details I have for you:
>>
>> System OS: Ubuntu 12.04 LTS
>> Kernel: 3.2.0-37-generic #58-Ubuntu SMP Thu Jan 24 15:28:10 UTC 2013
>> x86_64 x86_64 x86_64 GNU/Linux
>> Server: Virtual machine in a VMWare setup.
>> Disc: 300GB direct attached LUN
>>
>> We have an exact clone of this system for our acceptance environment. In
>> this environment we are unable to reproduce this problem/situation.
>>
>> Differences between the two days is that our services on 2014-03-21 were
>> quit busy with a lot of file changes on the xfs disc and on 2014-03-04
>> the system was very quiet on the moment the kernel traces appear and the
>> services get stuck.
>>
>> Any help is appreciated.
>>
>> Regards Michel Verbraak.
>
>
> Could you set up kdump and take a core dump next time it hangs?
> There is a couple suspicious items in the syslog entries
>
> --Mark.
>
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Mark,

We will setup the kdump. Can you elloborate on your suspicions?

Michel.
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