The following reply was made to PR kern/29407; it has been noted by GNATS.

From: christos@zoulas.com (Christos Zoulas)
To: gnats-bugs@netbsd.org, kern-bug-people@netbsd.org,
	gnats-admin@netbsd.org, netbsd-bugs@netbsd.org
Cc: 
Subject: Re: kern/29407: panic: m_copyback0: read-only
Date: Wed, 16 Feb 2005 18:12:32 -0500

 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)