Hi,

Since proctree_lock is a sx lock which uses 2 condition variables,
they alredy drop Giant (DROP_GIANT()) before sleeping. Are you secure
it is the right thing to do here?

Sorry, the commit message was not 100% clear. It should have been:

Retest a variable after sx_slock has been called. Giant might have been temporarily dropped while waiting for proctree_lock, allowing for an
intervening tty_close() that cleared tp->t_session.

Martin
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