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Date: Wed, 29 Mar 2006 15:37:10 +0200
From: Suleiman Souhlal <ssouhlal@FreeBSD.org>
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To: Kris Kennaway <kris@obsecurity.org>
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Cc: current@freebsd.org
Subject: Re: Fun with df
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Kris Kennaway wrote:
> On Tue, Mar 28, 2006 at 05:53:16PM +0200, Peter Holm wrote:
> 
>>I've seen this problem on both RELENG_6 from Mar 27 19:37 UTC and HEAD:
> 
> 
> Have you figured out how to cause it?  I and others see it
> occasionally (also things like this at reboot:
> 
> /c: unmount pending error: blocks -68512 files 0
> 
> which dates back at least to 5.3).  But I haven't been able to figure
> out how to trigger it on demand.

IIRC it's pretty easy to trigger: delete a lot of files, and unmount 
right after as rm is done.
umount -f in the middle of the rm might also work.

-- Suleiman