In the release code the spinlock is very short duration. All I
can think of is that there might be a MP race somewhere. There
are a few places in the release kernel where p_ucred is used as
if it were MPSAFE when, in fact, it was not MPSAFE.
Well, that spin lock was removed from master and the cred handling
code was rewritten.
-Matt
Matthew Dillon
<dillon@backplane.com>