help w/panic under heavy load - 5.4

Edwin edwin at verolan.com
Sat Jul 23 18:41:13 GMT 2005


Max Laier (max at love2party.net) wrote:
> On Saturday 23 July 2005 15:53, Edwin wrote:
> 
> Can we see one complete picture, please.  This includes:
> 
>   A trace
>   local vars in ip_fastforward including unfolded ip, m, ro.ro_rt and ifp.
>   local vars in ip_fragment().
> 
> Thanks.
> 
> -- 
> /"\  Best regards,                      | mlaier at freebsd.org
> \ /  Max Laier                          | ICQ #67774661
>  X   http://pf4freebsd.love2party.net/  | mlaier at EFnet
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Absolutely ;) - Thanks for taking the time! 

cheers. /edwin


Kernel name: D1-0722 (for reference)


mbsd05#	kgdb kernel.debug /usr/local/STORAGE/crash/vmcore.5

[GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-marcel-freebsd".
#0  doadump () at pcpu.h:159
159		__asm __volatile("movl %%fs:0,%0" : "=r" (td));
(kgdb) where
#0  doadump () at pcpu.h:159
#1  0xc04611f6 in db_fncall (dummy1=0, dummy2=0, dummy3=43, dummy4=0xc76bf9f4 "(úkÇ")
    at /usr/src/sys/ddb/db_command.c:531
#2  0xc0461004 in db_command (last_cmdp=0xc08c9264, cmd_table=0x0, aux_cmd_tablep=0xc08483b8, 
    aux_cmd_tablep_end=0xc08483d4) at /usr/src/sys/ddb/db_command.c:349
#3  0xc04610cc in db_command_loop () at /usr/src/sys/ddb/db_command.c:455
#4  0xc0462c51 in db_trap (type=3, code=0) at /usr/src/sys/ddb/db_main.c:221
#5  0xc0627af2 in kdb_trap (type=3, code=0, tf=0xc76bfb30) at /usr/src/sys/kern/subr_kdb.c:468
#6  0xc07b6394 in trap (frame=
      {tf_fs = -949288936, tf_es = -1067319280, tf_ds = -1065222128, tf_edi = 1, tf_esi = -1065197495, tf_ebp = -949224592, tf_isp = -949224612, tf_ebx = -949224548, tf_edx = 0, tf_ecx = -1060921344, tf_eax = 18, tf_trapno = 3, tf_err = 0, tf_eip = -1067288461, tf_cs = -1065222136, tf_eflags = 658, tf_esp = -949224560, tf_ss = -1067376657})
    at /usr/src/sys/i386/i386/trap.c:584
#7  0xc07a69ca in calltrap () at /usr/src/sys/i386/i386/exception.s:140
#8  0xc76b0018 in ?? ()
#9  0xc0620010 in schedcpu () at /usr/src/sys/kern/sched_4bsd.c:461
#10 0xc0611fef in panic (fmt=0xc0820008 "default") at /usr/src/sys/kern/kern_shutdown.c:550
#11 0xc0641a2c in m_copym (m=0x0, off0=1500, len=1480, wait=1) at /usr/src/sys/kern/uipc_mbuf.c:385
#12 0xc069b694 in ip_fragment (ip=0xc12f700e, m_frag=0xc76bfc6c, mtu=-1056788992, if_hwassist_flags=0, sw_csum=1)
    at /usr/src/sys/netinet/ip_output.c:967
#13 0xc06933c1 in ip_fastforward (m=0xc12e6c00) at /usr/src/sys/netinet/ip_fastfwd.c:572
#14 0xc0672a59 in ether_demux (ifp=0xc0f90000, m=0xc12e6c00) at /usr/src/sys/net/if_ethersubr.c:770
#15 0xc06727f5 in ether_input (ifp=0xc0f90000, m=0xc12e6c00) at /usr/src/sys/net/if_ethersubr.c:631
#16 0xc0713507 in sis_rxeof (sc=0xc0f90000) at /usr/src/sys/pci/if_sis.c:1636
#17 0xc071398f in sis_intr (arg=0xc0f90000) at /usr/src/sys/pci/if_sis.c:1841
#18 0xc0600430 in ithread_loop (arg=0xc0ec6880) at /usr/src/sys/kern/kern_intr.c:547
#19 0xc05ff8a4 in fork_exit (callout=0xc060030c <ithread_loop>, arg=0xc0ec6880, frame=0xc76bfd48)
    at /usr/src/sys/kern/kern_fork.c:791
#20 0xc07a6a2c in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:209
(kgdb) f 13
#13 0xc06933c1 in ip_fastforward (m=0xc12e6c00) at /usr/src/sys/netinet/ip_fastfwd.c:572
warning: Source file is more recent than executable.

572				if (ip_fragment(ip, &m, mtu, ifp->if_hwassist,
(kgdb) l
567				m->m_pkthdr.csum_flags |= CSUM_IP;
568				/*
569				 * ip_fragment expects ip_len and ip_off in host byte
570				 * order but returns all packets in network byte order
571				 */
572				if (ip_fragment(ip, &m, mtu, ifp->if_hwassist,
573						(~ifp->if_hwassist & CSUM_DELAY_IP))) {
574					goto drop;
575				}
576				KASSERT(m != NULL, ("null mbuf and no error"));
(kgdb) i loc
ip = (struct ip *) 0xc12f700e
m0 = (struct mbuf *) 0xc12f700e
ro = {ro_rt = 0xc11f8420, ro_dst = {sa_len = 16 '\020', sa_family = 2 '\002', 
    sa_data = "\000\000ˬ\002\005\000\000\000\000\000\000\000"}}
dst = (struct sockaddr_in *) 0xc76bfc3c
ia = (struct in_ifaddr *) 0x0
ifa = (struct ifaddr *) 0x0
ifp = (struct ifnet *) 0xc0f91800
odest = {s_addr = 84060352}
dest = {s_addr = 84060352}
sum = 0
ip_len = 0
error = 84060352
hlen = -1057417216
mtu = 0
__func__ = "ip_fastforward"
(kgdb) p *ip
$1 = {ip_hl = 5, ip_v = 4, ip_tos = 0 '\0', ip_len = 10240, ip_id = 61249, ip_off = 0, ip_ttl = 63 '?', 
  ip_p = 17 '\021', ip_sum = 31921, ip_src = {s_addr = 67479744}, ip_dst = {s_addr = 84060352}}
(kgdb) p *m
$2 = {m_hdr = {mh_next = 0x0, mh_nextpkt = 0x0, mh_data = 0xc12f700e "E", mh_len = 40, mh_flags = 3, 
    mh_type = 1}, M_dat = {MH = {MH_pkthdr = {rcvif = 0xc0f90000, len = 40, header = 0x0, csum_flags = 769, 
        csum_data = 0, tags = {slh_first = 0x0}}, MH_dat = {MH_ext = {ext_buf = 0xc12f7000 "", ext_free = 0, 
          ext_args = 0x0, ext_size = 2048, ref_cnt = 0x0, ext_type = 3}, 
        MH_databuf = "\000p/Á\000\000\000\000\000\000\000\000\000\b\000\000\000\000\000\000\003", '\0' <repeats 186 times>}}, 
    M_databuf = "\000\000ùÀ(\000\000\000\000\000\000\000\001\003", '\0' <repeats 11 times>, "p/Á\000\000\000\000\000\000\000\000\000\b\000\000\000\000\000\000\003", '\0' <repeats 186 times>}}
(kgdb) p *ro.ro_rt
$3 = {rt_nodes = {{rn_mklist = 0x0, rn_parent = 0xc11f8438, rn_bit = -1, rn_bmask = 0 '\0', rn_flags = 4 '\004', 
      rn_u = {rn_leaf = {rn_Key = 0xc1058680 "\020\002", rn_Mask = 0x0, rn_Dupedkey = 0x0}, rn_node = {
          rn_Off = -1056602496, rn_L = 0x0, rn_R = 0x0}}}, {rn_mklist = 0x0, rn_parent = 0xc11f8120, rn_bit = 61, 
      rn_bmask = 4 '\004', rn_flags = 4 '\004', rn_u = {rn_leaf = {rn_Key = 0x7 <Address 0x7 out of bounds>, 
          rn_Mask = 0xc11f9000 "\020¨úÀ8\204\037ÁÇÿ", rn_Dupedkey = 0xc11f8420}, rn_node = {rn_Off = 7, 
          rn_L = 0xc11f9000, rn_R = 0xc11f8420}}}}, rt_gateway = 0xc1058690, rt_flags = 132101, 
  rt_ifp = 0xc0f91800, rt_ifa = 0xc1054d00, rt_rmx = {rmx_mtu = 1500, rmx_expire = 333905919, rmx_pksent = 3868}, 
  rt_refcnt = 1, rt_genmask = 0x0, rt_llinfo = 0xc0fab320 "à»úÀàµúÀ \204\037Á", rt_gwroute = 0x0, 
  rt_parent = 0xc11f9000, rt_mtx = {mtx_object = {lo_class = 0xc0880b3c, lo_name = 0xc082a169 "rtentry", 
      lo_type = 0xc082a169 "rtentry", lo_flags = 4390912, lo_list = {tqe_next = 0x0, tqe_prev = 0x0}, 
      lo_witness = 0x0}, mtx_lock = 4, mtx_recurse = 0}}
(kgdb) p *ifp
$4 = {if_softc = 0xc0f91800, if_link = {tqe_next = 0xc0f90000, tqe_prev = 0xc08ebe84}, 
  if_xname = "sis0", '\0' <repeats 11 times>, if_dname = 0xc0f2ec2c "sis", if_dunit = 0, if_addrhead = {
    tqh_first = 0xc0ec0000, tqh_last = 0xc1040460}, if_klist = {kl_lock = 0xc08e5a40, kl_list = {
      slh_first = 0x0}}, if_pcount = 0, if_carp = 0x0, if_bpf = 0x0, if_index = 1, if_timer = 5, if_nvlans = 0, 
  if_flags = 34883, if_capabilities = 72, if_capenable = 72, if_linkmib = 0x0, if_linkmiblen = 0, if_data = {
    ifi_type = 6 '\006', ifi_physical = 0 '\0', ifi_addrlen = 6 '\006', ifi_hdrlen = 18 '\022', 
    ifi_link_state = 2 '\002', ifi_recvquota = 0 '\0', ifi_xmitquota = 0 '\0', ifi_datalen = 80 'P', 
    ifi_mtu = 1500, ifi_metric = 0, ifi_baudrate = 10000000, ifi_ipackets = 50, ifi_ierrors = 0, 
    ifi_opackets = 3914, ifi_oerrors = 0, ifi_collisions = 0, ifi_ibytes = 6146, ifi_obytes = 213356, 
    ifi_imcasts = 40, ifi_omcasts = 29, ifi_iqdrops = 0, ifi_noproto = 0, ifi_hwassist = 0, ifi_epoch = 0, 
    ifi_lastchange = {tv_sec = 0, tv_usec = 0}}, if_multiaddrs = {tqh_first = 0xc0fab3e0, tqh_last = 0xc0fabcc0}, 
  if_amcount = 0, if_output = 0xc0671e04 <ether_output>, if_input = 0xc0672598 <ether_input>, 
  if_start = 0xc0713c10 <sis_start>, if_ioctl = 0xc071497c <sis_ioctl>, if_watchdog = 0xc0714b04 <sis_watchdog>, 
  if_init = 0xc0713f60 <sis_init>, if_resolvemulti = 0xc0672e48 <ether_resolvemulti>, if_spare1 = 0x0, 
  if_spare2 = 0x0, if_spare3 = 0x0, if_spare_flags1 = 0, if_spare_flags2 = 0, if_snd = {ifq_head = 0x0, 
    ifq_tail = 0x0, ifq_len = 0, ifq_maxlen = 127, ifq_drops = 0, ifq_mtx = {mtx_object = {lo_class = 0xc0880b3c, 
        lo_name = 0xc0f9180c "sis0", lo_type = 0xc0829304 "if send queue", lo_flags = 196608, lo_list = {
          tqe_next = 0x0, tqe_prev = 0x0}, lo_witness = 0x0}, mtx_lock = 4, mtx_recurse = 0}, ifq_drv_head = 0x0, 
    ifq_drv_tail = 0x0, ifq_drv_len = 0, ifq_drv_maxlen = 127, altq_type = 0, altq_flags = 1, altq_disc = 0x0, 
    altq_ifp = 0xc0f91800, altq_enqueue = 0, altq_dequeue = 0, altq_request = 0, altq_clfier = 0x0, 
    altq_classify = 0, altq_tbr = 0x0, altq_cdnr = 0x0}, if_broadcastaddr = 0xc07db600 "ÿÿÿÿÿÿ", lltables = 0x0, 
  if_label = 0x0, if_prefixhead = {tqh_first = 0x0, tqh_last = 0xc0f91968}, if_afdata = {0x0 <repeats 28 times>, 
    0xc0faaab0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, if_afdata_initialized = 1, if_afdata_mtx = {
    mtx_object = {lo_class = 0xc0880b3c, lo_name = 0xc08292f4 "if_afdata", lo_type = 0xc08292f4 "if_afdata", 
      lo_flags = 196608, lo_list = {tqe_next = 0x0, tqe_prev = 0x0}, lo_witness = 0x0}, mtx_lock = 4, 
    mtx_recurse = 0}, if_starttask = {ta_link = {stqe_next = 0x0}, ta_pending = 0, ta_priority = 0, 
    ta_func = 0xc06711c0 <if_start_deferred>, ta_context = 0xc0f91800}}
(kgdb) f 12
#12 0xc069b694 in ip_fragment (ip=0xc12f700e, m_frag=0xc76bfc6c, mtu=-1056788992, if_hwassist_flags=0, sw_csum=1)
    at /usr/src/sys/netinet/ip_output.c:967
967			m->m_next = m_copy(m0, off, len);
(kgdb) l
962				len = ip->ip_len - off;
963				m->m_flags |= M_LASTFRAG;
964			} else
965				mhip->ip_off |= IP_MF;
966			mhip->ip_len = htons((u_short)(len + mhlen));
967			m->m_next = m_copy(m0, off, len);
968			if (m->m_next == NULL) {	/* copy failed */
969				m_free(m);
970				error = ENOBUFS;	/* ??? */
971				ipstat.ips_odropped++;
(kgdb) i loc
mhip = (struct ip *) 0xc102ae40
m = (struct mbuf *) 0xc102ae00
mhlen = 20
error = 0
hlen = 20
len = 1480
off = 1500
m0 = (struct mbuf *) 0xc12e6c00
firstlen = 1480
mnext = (struct mbuf **) 0xc12e6c04
nfrags = 1
(kgdb) quit
mbsd05#	





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