vm_map.c lock up (Was: Re: NFS Locking Issue)

[User Freebsd]

On Wed, 5 Jul 2006, Robert Watson wrote:

> If you can get into DDB when the hang has occurred, output via serial console 
> for the following commands would be very helpful:
>
> show pcpu
> show allpcpu
> ps
> trace
> traceall
> show locks
> show alllocks
> show uma
> show malloc
> show lockedvnods

'k, after 16 days uptime, the server that I got all the debugging turned 
on for finally hung up solid ... I was able to break into DDB over the 
serial link, and have run all of the above on it ... and the output is 
attached ...

One thing to note is that the ps listing is not complete ... there are >6k 
processes running at the time, and I don't know how to get rid of the 
'--more--' prompt :(  After 1k processes, I just hit 'q' and went onto the 
other commands ...

Also, traceall gave me a 'No such command' error ... now that I think 
about it, my luck, it was supposed to be 'trace all'?

If this doesn't provide enough information, please let me know what else I 
should do the next time through, besides the above commands ...

Oh, and how do you get DDB to 'dump core' in 6.x?  Back in 4.x days, I'd 
just do 'panic' (maybe twice) at the DDB prompt, but that didn't work with 
6.x ... it just gave me a stacktrace and then the DDB> prompt both times 
...

----
Marc G. Fournier           Hub.Org Networking Services (http://www.hub.org)
Email . scrappy at hub.org                              MSN . scrappy at hub.org
Yahoo . yscrappy               Skype: hub.org        ICQ . 7615664
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