Processes in "ufs" state (PR kern/104406)

[Kris Kennaway]

On Sun, Oct 15, 2006 at 12:35:11PM +0400, Sergey Zaharchenko wrote:
> Hello list!
> 
> I've stumbled across this (probable) bug when doing some
> number-crunching. Processes which try to access the filesystem hang at
> some point when another process has been gobbling up CPU time for a
> sufficiently long time. Interestingly, processes which have already
> opened some files before the `hang' can apparently read/write them
> without hindrance (iostat shows some disk activity). Interactive
> processes run well too. When the number-cruncher is `kill -STOP'ped and
> `kill -CONT'ed, everything runs well for another while. It's reliably
> and frequently reproducible here both on recent and late August CURRENT,
> the kernel is GENERIC, the hardware is basic (no RAID, etc.).
> 
> Could anyone experienced enough try to look into this and/or give advice
> for debugging the problem? I have ddb available, but I'm not sure about
> where to look.
> 
> http://www.freebsd.org/cgi/query-pr.cgi?pr=104406

I'm unable to reproduce so far.

Kris
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