FreeBSD 5.3 freezes under heavy hdd load

Brian Reichert reichert at
Mon Mar 7 13:05:41 PST 2005

On Mon, Mar 07, 2005 at 05:12:44PM +0000, Kris Kennaway wrote:
> It is necessary to increase KSTACK_PAGES (e.g. to 4) on machines with
> certain patterns of heavy disk write load to avoid double faults in
> the softupdates code (softupdates has potentially unbounded call stack
> and can overflow the default kernel stack size without too much
> effort).

Can these 'certain patterns' be characterized?  I've got a system
that hangs on haavy rsync usage, where the file sizes can me measured
in a half-gig or more...

> This would cause panics though, not freezes.

I can't tell remotely if all of my hangs are panics, as it's a
remote box.  Once, on the console of a hung box, I found

  panic: worklist_remove: not on list

This box did not reboot of it's own accord, and has wedged again
under a similar workload...

> Kris
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Brian Reichert				<reichert at>
55 Crystal Ave. #286			Daytime number: (603) 434-6842
Derry NH 03038-1725 USA			BSD admin/developer at large	

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