[uml-user] how to unlock root filesystem

[Bin R. <br...@ca...>]

Hi,

After the user mode linux kernel panics, I boot UML again
and am told the root filesystem is locked by PID xxxxxx.
When I do a 'ps aux | grep linux', I find a lot of kernel threads
and processes running. Sometimes I can kill all of them with
'kill' or 'killall'. But most of the times, they just persists, possibly
because the signal is blocked.

As a result, I have to reboot my machine in order start UML again.
Is there any easy method to unlock the root file?

Thanks a lot.
-- Bin