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Date:      Sun, 13 Jul 2003 00:04:41 -0400
From:      Jeff Walters <jeff@walters.name>
To:        Sean Kelly <smkelly@FreeBSD.org>, Don Lewis <truckman@FreeBSD.org>
Cc:        current@FreeBSD.org
Subject:   Re: sporadic disk syncing failures when shutting down
Message-ID:  <200307130004.41123.jeff@walters.name>
In-Reply-To: <20030713032425.GA77413@edgemaster.zombie.org>
References:  <200307130136.h6D1arM7023826@gw.catspoiler.org> <20030713032425.GA77413@edgemaster.zombie.org>

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On Saturday 12 July 2003 11:24 pm, Sean Kelly wrote:

> > syncing disks, buffers remaining... 54 54 54 54 54 54 54 54 54 54 54 54
> > 54 54 54 54 54 54 54 54 giving up on 54 buffers
> > Uptime: 6m42s
> > Terminate ACPI
> > Rebooting...
> >
> > Each time this has happened, fsck finds and nukes a bunch of empty
> > directories.  The last time this happened, the /etc/rc.d/yp* files that
> > mergmaster updated were missing after the reboot and fsck had done its
> > work.  Nothing has ever shown up in lost+found.
> >
> > Has anyone else seen this?
>
> I have seen this a lot, but not as much lately. Sadly, I don't have any
> more data than you on why it happens. I've seen it give up on a rather
> frighteningly large number of buffers before, though...

I hate to even mentioned such an unscientific observation where I made 
multiple changes at once, but I'll provide a data point.  I also saw this 
problem crop up at the same time as I tried the SCHED_ULE scheduler a couple 
of months ago.  I re-cvsup'ed CURRENT and switched back to SCHED_4BSD and it 
went away.



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