I encountered two LORs in the past, especially during the testing phase of the just behind the corner FreeBSD 6.0 release.
I already reported about two of them, but wanted to point out that the second seems to be fixed, as shown in this patch. Regrettably, the MFC seem not to have taken place in the RELENG_6 branch... yet. On the other side, this one is not known to generate panic or some other bad behavior, so i think it is ok.