Re: can't unmount

["K. Richard Pixley" <rich@noir.com>]

  On 8/12/10 10:46 , C Anthony Risinger wrote:
> On Aug 12, 2010, at 10:58 AM, "K. Richard Pixley"<rich@noir.com>  wrote:
>> And should I be worried about what umount -l might be leaving
>> behind?  (eg, any unfreed kernel resources)  Or is that a reasonable
>> way to deal with this situation on an ongoing basis?
>>
>> On 8/12/10 08:55 , K. Richard Pixley wrote:
>>> I'm running into a situation where I can't unmount a mounted
>>> snapshot.  It shows "busy" even though neither lsof nor fuser show
>>> any open files.  Umount -f doesn't work although umount -l does.
>>>
>>> Is there anything else I can do to debug this scenario or to clear
>>> the busy status myself?  Or am I down to rebooting each time?
>>>
>>> This is on stock ubuntu-10.04, x86.
> You are lazy unmounting, as I understand, you are essentially just
> hiding the fact that the mount was busy to userspace... The mount will
> remain active in the kernel until you resolve whatever was stopping
> umount in the first place; kernel will then silently unmount.
Understood.
> Does this affect all of your mounted snapshots, or only a particular
> one?
I'm only mounting one at a time so I haven't noticed.  Will check next 
time it occurs.

--rich