> m_makewritable origlen 112 newlen 182 error 0
> panic: m_makewritable: length changed

the following would be the minimal fix.

YAMAMOTO Takashi

Index: if_xennet.c
===================================================================
--- if_xennet.c	(revision 1576)
+++ if_xennet.c	(working copy)
@@ -787,8 +787,7 @@ xen_network_handler(void *arg)
 			 * memory, copy data and push the receive
 			 * buffer back to the hypervisor.
 			 */
-			m->m_len = MHLEN;
-			m->m_pkthdr.len = 0;
+			m->m_len = m->m_pkthdr.len = 0;
 			m_copyback(m, 0, rx->status, pktp);
 			xennet_rx_push_buffer(sc, rx->id);
 			if (m->m_pkthdr.len < rx->status) {