Date: Fri, 5 May 2000 16:50:31 -0400 (EDT) From: Howard Leadmon <howardl@account.abs.net> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: Bill Paul <wpaul@skynet.ctr.columbia.edu>, Greg Lehey <grog@lemis.com>, freebsd-stable@FreeBSD.ORG, freebsd-hackers@FreeBSD.ORG Subject: Re: Debugging Kernel/System Crashes, can anyone help?? Message-ID: <200005052050.QAA31307@account.abs.net> In-Reply-To: <200005051828.LAA80765@apollo.backplane.com> from Matthew Dillon at "May 5, 2000 11:28:55 am"
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> : Hello Matt,
> :
> : Well I almost thought we had something here, as the machine actually stayed
> :online for over a day this past time. Anyway I did add your patch, and when
> :the machine died I now have a crashdump of the data with your patch included,
> :when I will provide below. FYI, I have kept the past crashinfo as well as
> :the current one, so if you need any other info just let me know. Hopefully
> :something in this latest crash will stick out to you..
> :...
>
> This looks to be a different bug. I think it may be in Bill Paul's
> department.
>
> It looks like either 'sc' is NULL, or 'sc->dc_btag' or
> 'sc->dc_bhandle' is NULL in dc_intr. This could be SMP/interrupt
> related.
>
> It's hard to tell exactly which line is crunching due to the inline
> I/O instruction in machien/cpufunc.h. It would help if you could
> 'nm kernel.debug | fgrep dc_intr' to locate the start adderss of
> the dc_intr procedure.
OK, as requested here is the output:
c01c1850 t dc_intr
c022f41c t fdc_intr
> It would also help if you could do the following from the gdb of the
> kernel:
>
> frame 14
(kgdb) frame 14
#14 0xc01c18fb in dc_intr (arg=0xc0de6000) at machine/cpufunc.h:331
331 __asm __volatile("outl %0,%%dx" : : "a" (data), "d" (port));
> print sc
(kgdb) print sc
$1 = (struct dc_softc *) 0xc0de6000
> print *sc
(kgdb) print *sc
$2 = {arpcom = {ac_if = {if_softc = 0xc0de6000, if_name = 0xc0246530 "dc",
if_link = {tqe_next = 0xc5901204, tqe_prev = 0xc02980f4}, if_addrhead = {
tqh_first = 0xc5901800, tqh_last = 0xc59eee10}, if_pcount = 0,
if_bpf = 0x0, if_index = 1, if_unit = 0, if_timer = 0,
if_flags = -30717, if_ipending = 0, if_linkmib = 0x0, if_linkmiblen = 0,
if_data = {ifi_type = 6 '\006', ifi_physical = 0 '\000',
ifi_addrlen = 6 '\006', ifi_hdrlen = 14 '\016',
ifi_recvquota = 0 '\000', ifi_xmitquota = 0 '\000', ifi_mtu = 1500,
ifi_metric = 0, ifi_baudrate = 10000000, ifi_ipackets = 2683140,
ifi_ierrors = 0, ifi_opackets = 1716990, ifi_oerrors = 0,
ifi_collisions = 0, ifi_ibytes = 394131741, ifi_obytes = 295972886,
ifi_imcasts = 17, ifi_omcasts = 0, ifi_iqdrops = 0, ifi_noproto = 0,
ifi_recvtiming = 0, ifi_xmittiming = 0, ifi_lastchange = {tv_sec = 0,
tv_usec = 0}}, if_multiaddrs = {lh_first = 0xc0de7120},
if_amcount = 0, if_output = 0xc0174a04 <ether_output>,
if_start = 0xc01c1fa4 <dc_start>, if_done = 0,
if_ioctl = 0xc01c2848 <dc_ioctl>,
if_watchdog = 0xc01c29ac <dc_watchdog>, if_poll_recv = 0,
if_poll_xmit = 0, if_poll_intren = 0, if_poll_slowinput = 0,
if_init = 0xc01c20e4 <dc_init>,
if_resolvemulti = 0xc017508c <ether_resolvemulti>, if_snd = {
ifq_head = 0x0, ifq_tail = 0x0, ifq_len = 0, ifq_maxlen = 255,
ifq_drops = 0}, if_poll_slowq = 0x0, if_prefixhead = {tqh_first = 0x0,
tqh_last = 0xc0de60d0}}, ac_enaddr = "\000Àð;§ë", ac_multicnt = 0,
ac_ng = 0x0}, dc_bhandle = 54272, dc_btag = 0, dc_intrhand = 0xc0de7ac0,
dc_irq = 0xc5900140, dc_res = 0xc59001c0, dc_info = 0xc026f004,
dc_miibus = 0xc590a880, dc_unit = 0 '\000', dc_type = 4 '\004',
dc_pmode = 1 '\001', dc_link = 0 '\000', dc_cachesize = 8 '\b',
dc_pnic_rx_bug_save = 0, dc_pnic_rx_buf = 0x0, dc_if_flags = 0,
dc_if_media = 1048614, dc_flags = 521, dc_txthresh = 0,
dc_ldata = 0xd5660000, dc_cdata = {dc_rx_chain = {0x0 <repeats 64 times>},
dc_tx_chain = {0x0 <repeats 256 times>}, dc_sbuf = {0 <repeats 15 times>,
32768, 0 <repeats 15 times>, 16384, 0, 0, 0, 0, 0, 0, 0, 49152, 15344,
60327, 0, 0, 0, 0, 0, 0}, dc_pad = '\000' <repeats 59 times>,
dc_tx_prod = 10, dc_tx_cons = 10, dc_tx_cnt = 0, dc_rx_prod = 4},
dc_stat_ch = {callout = 0xcd6a56c0}}
>
> -Matt
> Matthew Dillon
> <dillon@backplane.com>
FYI, the machine in general is staying up a bit longer, so maybe you
nailed one bug and there are just a few more that also need to be
caught. :)
Anyway thinks for trying to help me track this one down as it's very
much appreicated, and if you need any other info just let me know...
---
Howard Leadmon - howardl@abs.net - http://www.abs.net
ABSnet Internet Services - Phone: 410-361-8160 - FAX: 410-361-8162
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