3af236b5e3
there was a race between cunmount() and walk() on Mhead.from as Mhead.from was unconditionally freed when we cunmount(), but findmount might have already returned the Mhead in walk(). we have to ensure that Mhead.from is not freed before the Mhead itself (now done in putmhead() once the reference count of the Mhead drops to zero). the Mhead struct contained two unused locks, removing. no need to hold Pgrp.ns lock in closegrp() as nobody can get to it (refcount droped to zero). avoid cclose() and freemount() while holding Mhead.lock or Pgrp.ns locks as it might block on a hung up fileserver. remove the debug prints... cleanup: use nil for pointers, remove redundant nil checks before putmhead(). |
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