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Date: Fri, 11 Jan 2008 10:56:27 -0800
From: Darren Pilgrim <freebsd@bitfreak.org>
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To: Kris Kennaway <kris@FreeBSD.org>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Unable to unmount idle filesystem on 6.2
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Kris Kennaway wrote:
> Darren Pilgrim wrote:
>> I'm unable to unmount an idle filesystem (or even drop it to
>> read-only):
>>
>> # mount
>> /dev/da0s1a on / (ufs, local, noatime)
>> devfs on /dev (devfs, local)
>> /dev/da0s1d on /var (ufs, local, noatime, soft-updates)
>> /dev/da0s1e on /usr (ufs, local, noatime, soft-updates)
>> /dev/da0s1fp1 on /usr/obj (ufs, asynchronous, local, noatime)
>> /dev/da0s1fp2 on /usr/ports (ufs, local, soft-updates)
>> /dev/da0s1fp3 on /usr/src (ufs, local, soft-updates)
>> /dev/da0s2d on /data (ufs, local, noatime, soft-updates)
>>
>> # fstat -f /usr/ports
>> USER     CMD          PID   FD MOUNT      INUM MODE         SZ|DV R/W
>>
>> # umount /usr/ports
>> umount: unmount of /usr/ports failed: Device busy
>>
>> # umount -f /usr/ports
>> umount: unmount of /usr/ports failed: Device busy
>>
>> # mount -o ro /usr/ports
>> mount: /dev/da0s1fp2: Operation not permitted
>>
>> # uname -r
>> 6.2-RELEASE-p8
> 
> Strange, can you break to DDB and do 'show lockedvnods'?

I don't have the necessary options compiled into the kernel.  I'll 
build a kernel with the KDB and DDB options and hope the problem 
recurs.