Interesting, I'd be curious to know what the panic for this looks like?
----- Original Message -----
From: "Davide Italiano" <dav...@freebsd.org>
Author: davide
Date: Sun Apr 13 01:15:37 2014
New Revision: 264392
URL: http://svnweb.freebsd.org/changeset/base/264392
Log:
Fix a panic in zfs_rename().
this is due to a wrong dereference of a vnode when it's not locked and
can be (potentially) recycled. 'sdvp' cannot be locked on zfs_rename()
entry point because the VFS can't be sure that this scenario is
LOR-free (it might violate the parent->child lock acquisition rule).
Dereference 'tdvp' instead, which is already locked on entry, and access
'sdvp' fields only when it's safe, i.e. under ZFS_ENTER scope.
While at it, remove the usage of VOP_REALVP, as long as this is a NOP
on FreeBSD.
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