Panic on umount -f

[Kris Kennaway]

Michael Lednev wrote:
> Hello, Kris.
> 
> On 2 ?????? 2008 ?., 14:07:36 you wrote:
> 
> KK> Yes, long-standing issue with unexpected mounted device removal.  Don't
> KK> do that :)
> 
> Thanks, already found this PR, it's already 5 yo, wow :)
> 

There have been some recent partial workarounds committed in current, 
but this issue is quite difficult to fix completely.

Kris