Subject: panic("sbdrop")
To: None <tech-net@netbsd.org>
From: Andreas Oman <andoma@packetfront.com>
List: tech-net
Date: 11/20/2001 17:45:16
I'm currently involved in a project developing a hardware
accelerated router using NetBSD as kernel.
I've a problem with an 1.5V kernel and i would be glad if someone could
give me a hint of why sbdrop() panics. The panic has showed itself a
few times and i cant seem to correlate this crash with other events
on the machine.
The kernel has been a bit modified in order to support the routing
hardware but i havent touched any part of TCP nor the socket code.
Does anyone know anything about this, and/or does anyone know whats
going on (or not going on) ?
(gdb) list *0x116430
0x116430 is in tcp_input (../../../../netinet/tcp_input.c:1281).
1277 acked = th->th_ack - tp->snd_una;
1278 tcpstat.tcps_rcvackpack++;
1279 tcpstat.tcps_rcvackbyte += acked;
1280 ND6_HINT(tp);
1281 sbdrop(&so->so_snd, acked);
(gdb) list *0xd1140
0xd1140 is in sbdrop (../../../../kern/uipc_socket2.c:714).
709
710 next = (m = sb->sb_mb) ? m->m_nextpkt : 0;
711 while (len > 0) {
712 if (m == 0) {
713 if (next == 0)
714 panic("sbdrop");
715 m = next;
716 next = m->m_nextpkt;
717 continue;
718 }