System hanging during dump

Kostik Belousov kostikbel at
Sun Oct 19 01:39:11 PDT 2008

On Sun, Oct 19, 2008 at 02:21:04PM +1100, Peter Jeremy wrote:
> On 2008-Oct-15 21:37:36 +0100, Kris Kennaway <kris at> wrote:
> >Peter, there was a bug causing dump to hang (completely unrelated to 
> >UFS2 snapshot generation) merged to RELENG_7 a month or so ago.  Can you 
> >try updating?
> Well, dump wasn't hanging, rather it was hanging the rest of the system.
> In any case, I have upgraded to a recent -stable and am no longer able
> to reproduce the problem.
> I have built myself a looping 'ps -axl' which should let me gather more
> information if it does re-appear.  (In the process, I've found that ps
> leaks memory, though that's not a problem until you wrap it in a loop).

What memory ? Kernel one ? How did you noted this ? Could you add
vmstat -z and vmstat -m to the loop and watch what allocation grows ?

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