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Date: Sat, 12 Jul 2003 23:32:36 -0700 (PDT)
From: Don Lewis <truckman@FreeBSD.org>
To: jeff@walters.name
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cc: smkelly@FreeBSD.org
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Subject: Re: sporadic disk syncing failures when shutting down
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On 13 Jul, Jeff Walters wrote:
> 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.

I haven't gotten around to trying anything other than SCHED_4BSD.