K 10
svn:author
V 8
rmacklem
K 8
svn:date
V 27
2017-04-10T22:47:18.920753Z
K 7
svn:log
V 610
Fix a crash during unmount of an NFSv4.1 mount.

Larry Rosenman reported a crash on freebsd-current@ which was caused by
a premature release of the krpc backchannel socket structure.
I believe this was caused by a race between the SVC_RELEASE() in clnt_vc.c
and the xprt_unregister() in the higher layer (clnt_rc.c), which tried
to lock the mutex in the xprt structure and crashed.
This patch fixes this by removing the xprt_unregister() in the clnt_vc
layer and allowing this to always be done by the clnt_rc (higher reconnect
layer).

Reported by:	ler@lerctr.org
Tested by:	ler@letctr.org
MFC after:	2 weeks

END