Date: Sun, 6 May 2001 18:27:28 +0930 From: Ian West <ian@apdata.com.au> To: freebsd-net@freebsd.org Subject: Netgraph/fxp/pppoe causing system panic in 4.3 stable. Message-ID: <20010506182728.L1899@rose.niw.com.au>
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I have a reproducible kernel panic in 4.3 stable caused (sort of) by
netgraph, or maybe by fxp0 in conjunction with pppoe. It is caused by
setting up and attempting to open a pppoe connection over an fxp
interface, due to fxp_start being called before fxp device has been
opened. (This only occurs if the fxp interface has not been configured
in any way since since boot.)
Maybe if ethernet if has not been opened, and is down, it should be brought up
by opening it for pppoe similar to ifconfig bringing it up when an ip
address is assigned ?
Causing the fault is as simple as running user land ppp, configuring 'set line
pppoe:fxp0' and then trying to open the link.
Backtrace is as follows.
#0 0xc0289b06 in fxp_start (ifp=0xc0cbea00) at ../../pci/if_fxp.c:1083
#1 0xc01e4de4 in ether_output_frame (ifp=0xc0cbea00, m=0xc09d3d00) at ../../net/if_ethersubr.c:399
#2 0xc01fac2c in ng_ether_rcv_lower (node=0xc0cd3100, m=0xc09d3d00, meta=0x0) at ../../netgraph/ng_ether.c:629
#3 0xc01fab55 in ng_ether_rcvdata (hook=0xc0e0bf40, m=0xc09d3d00, meta=0x0) at ../../netgraph/ng_ether.c:595
#4 0xc01f8401 in ng_send_data (hook=0xc0e0bfc0, m=0xc09d3d00, meta=0x0) at ../../netgraph/ng_base.c:1648
#5 0xc01fc6e9 in sendpacket (sp=0xc0e0f840) at ../../netgraph/ng_pppoe.c:1451
#6 0xc01fb99e in pppoe_start (sp=0xc0e0f840) at ../../netgraph/ng_pppoe.c:754
#7 0xc01fb824 in ng_pppoe_rcvmsg (node=0xc0da8ac0, msg=0xc0e0f800, retaddr=0xc0e0bf00 "[7]:", rptr=0xc643fe28)
at ../../netgraph/ng_pppoe.c:660
#8 0xc01f7925 in ng_send_msg (here=0xc0d607c0, msg=0xc0e0f800, address=0xc0cd4650 ".:tun0", rptr=0xc643fe28)
at ../../netgraph/ng_base.c:1180
#9 0xc01fc954 in ngc_send (so=0xc5d5dc00, flags=0, m=0xc09e1f00, addr=0xc0cd4620, control=0x0, p=0xc5f44700)
at ../../netgraph/ng_socket.c:242
#10 0xc01bffcb in sosend (so=0xc5d5dc00, addr=0xc0cd4620, uio=0xc643fed0, top=0xc09e1f00, control=0x0, flags=0, p=0xc5f44700)
at ../../kern/uipc_socket.c:611
#11 0xc01c377f in sendit (p=0xc5f44700, s=2, mp=0xc643ff10, flags=0) at ../../kern/uipc_syscalls.c:583
#12 0xc01c3882 in sendto (p=0xc5f44700, uap=0xc643ff80) at ../../kern/uipc_syscalls.c:636
#13 0xc03340ad in syscall2 (frame={tf_fs = 47, tf_es = 47, tf_ds = 47, tf_edi = -1077941491, tf_esi = -1077941498, tf_ebp = -1077940984,
tf_isp = -968622124, tf_ebx = 672834760, tf_edx = -1077941500, tf_ecx = -1077941500, tf_eax = 133, tf_trapno = 7, tf_err = 2,
tf_eip = 673075808, tf_cs = 31, tf_eflags = 518, tf_esp = -1077941588, tf_ss = 47}) at ../../i386/i386/trap.c:1150
Program received signal SIGSEGV, Segmentation fault.
0xc0289b06 in fxp_start (ifp=0xc0cbea00) at ../../pci/if_fxp.c:1083
1083 txp = sc->cbl_last->next;
(kgdb) print sc
$1 = (struct fxp_softc *) 0xc0cbea00
(kgdb) print sc->cbl_last
$2 = (struct fxp_cb_tx *) 0x0
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