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a7b125e9a5
zfs_getattr_fast() was missing a lock on the ZFS superblock which could result in zfs_znode_dmu_fini() clearing the zp->z_sa_hdl member while zfs_getattr_fast() was accessing the znode. The result of this would usually be a panic. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Fixes #431