Hold the currently selected vnode's lock across the call to VOP_GETVOBJECT.
Hold the currently selected vnode's lock across the call to VOP_GETVOBJECT.

Don't try to create a vm object before the file system has a chance to finish
initializing it.  This is incorrect for a number of reasons.  Firstly, that
VOP requires a lock which the file system may not have initialized yet. Also,
open and others will create a vm object if it is necessary later.

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