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7656 unlinking directory on tmpfs can cause kernel panic

*** 1103,1114 **** rw_enter(&parent->tn_rwlock, RW_WRITER); rw_enter(&tp->tn_rwlock, RW_WRITER); if (tp->tn_type != VDIR || (error = secpolicy_fs_linkdir(cred, dvp->v_vfsp)) == 0) ! error = tdirdelete(parent, tp, nm, tp->tn_type == VDIR ? ! DR_RMDIR : DR_REMOVE, cred); rw_exit(&tp->tn_rwlock); rw_exit(&parent->tn_rwlock); vnevent_remove(TNTOV(tp), dvp, nm, ct); tmpnode_rele(tp); --- 1103,1113 ---- rw_enter(&parent->tn_rwlock, RW_WRITER); rw_enter(&tp->tn_rwlock, RW_WRITER); if (tp->tn_type != VDIR || (error = secpolicy_fs_linkdir(cred, dvp->v_vfsp)) == 0) ! error = tdirdelete(parent, tp, nm, DR_REMOVE, cred); rw_exit(&tp->tn_rwlock); rw_exit(&parent->tn_rwlock); vnevent_remove(TNTOV(tp), dvp, nm, ct); tmpnode_rele(tp);