[OpenAFS-port-darwin] rc7 and rc 8 kernel panics

[Chaskiel M Grundman]

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The RC7 panic 'vnode_rele_ext:  usecount -ve' was fixed for -rc8 (by deltas =

darwin80-mkdir-error-leak-fix-20060215 and vnode-ref-verification-20060217)

The rc8 panic is a new problem. it _appears_ that AFTOV(tvc) is becoming=20
NULL in the midst of the loop in afs_cbqueue.c:afs_CheckCallbacks. this is=20
now ticket 27224 on rt.central.org
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