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SubjectRe: [patch 1/2] autofs4: allow autofs to work outside the initial PID namespace
On 11/18, Ian Kent wrote:
>
> It might be sufficient to surround the contents of show_options() with a
> lock on wq_mutex and update the check at the top to
>
> "lock; if (!sbi || sbi->catatonic) {unlock, return 0; } ..."

Or perhaps you can add synchronize_rcu() after swap(oz_pgrp, new_pid),
then show_options() can use rcu_read_lock().

This makes me think that we want put_pid_rcu() but I do not see a
simple way to implement it without synchronize_rcu or kmalloc...

Oleg.



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