On Feb 16,  8:25pm, dlagno@mail.ru (Denis Lagno) wrote:
-- Subject: kern/29407: panic: m_copyback0: read-only

| >How-To-Repeat:
| >From scarce observations this panic arises when my first ftp access
| is from some other host in the local network.  The host that panics
| is a gateway to Internet.  I use NAT and ipsec.
| I first observed this panic with week-old -current.  I updated system
| and the panic persist.
| >Fix:
| N/A

Try this:

Index: uipc_mbuf.c
===================================================================
RCS file: /cvsroot/src/sys/kern/uipc_mbuf.c,v
retrieving revision 1.92
diff -u -u -r1.92 uipc_mbuf.c
--- uipc_mbuf.c	24 Jan 2005 21:25:09 -0000	1.92
+++ uipc_mbuf.c	16 Feb 2005 23:11:52 -0000
@@ -1077,7 +1077,7 @@
 #if defined(DEBUG)
 	error =
 #endif /* defined(DEBUG) */
-	m_copyback0(&m0, off, len, cp,
+	m_copyback0(&m0, off, len, cp, M_COPYBACK0_COW|
 	    M_COPYBACK0_COPYBACK|M_COPYBACK0_EXTEND, M_DONTWAIT);
 
 #if defined(DEBUG)