[Bug 262633] Missing mtx protecting variable prison->pr_prison_racct

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262633

--- Comment #1 from firk@cantconnect.ru ---
What can be done:

1) disable racct - obviously not the case

2) rollback commit
https://svnweb.freebsd.org/base?view=revision&revision=221362 - seems also not
the case

3) disable jail renaming when racct enabled - personally I don't see any
problems with this (I'm not sure if jail renaming ever used by someone)

4) add protective lock for prison->pr_prison_racct
  It will works, but I don't think it is good idea. Currently, only protected
proc->p_ucred needed to get related jail racct pointer. Requiring any
additional locks to do this will make racct code more complicated.

5) very complicated jail-rename procedure, locking all processes inside before
renaming and unlocking them after; this will lead to some performance loss, but
since jail renaming never used, nobody will notice it; I'm not sure if this is
needed

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