Index: uipc_usrreq.c
    ===================================================================
    RCS file: /cvsroot/src/sys/kern/uipc_usrreq.c,v
    retrieving revision 1.86
    diff -u -p -u -r1.86 uipc_usrreq.c
    --- uipc_usrreq.c	11 Dec 2005 12:24:30 -0000	1.86
    +++ uipc_usrreq.c	28 Feb 2006 16:51:26 -0000
    @@ -339,8 +339,10 @@ uipc_usrreq(struct socket *so, int req, 
     		case SOCK_STREAM:
     #define	rcv (&so2->so_rcv)
     #define	snd (&so->so_snd)
    -			if (unp->unp_conn == 0)
    -				panic("uipc 3");
    +			if (unp->unp_conn == 0) {
    +				error = ENOTCONN;
    +				break;
    +			}
     			so2 = unp->unp_conn->unp_socket;
     			if (unp->unp_conn->unp_flags & UNP_WANTCRED) {
     				/*


i don't know but isn't this just going to hide a real bug?  it
seems that the panic() is to uncover an unconsistent condition
and we've done that, so the correct solution is to find what is
causing that and fix it, rather than change the panic.


(i'm not familiar with this exact code, but the above seems to
be a fairly common case in kernel code.)