can't unmount

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.

--rich

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?

--rich

Quoted 10 lines · K. Richard Pixley

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.

--rich

Quoted 9 lines · K. Richard Pixley

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?

Quoted 4 lines · K. Richard Pixley

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.

Quoted 4 lines

Quoted 4 lines

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.

Does this affect all of your mounted snapshots, or only a particular one?

Quoted 14 lines · C Anthony Risinger

Quoted 12 lines · K. Richard Pixley

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?

Quoted 7 lines · K. Richard Pixley

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?

Quoted 6 lines

Quoted 1 line

Quoted 1 line

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.

Quoted 2 lines

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.