Re: PANIC: trap.c

Hello

Robert Watson wrote:

>On Mon, 16 Feb 2004, Jiri Mikulas wrote:
>
>>Hello, just only for info I got this panic on:  FreeBSD 5.2-CURRENT #1:
>>Mon Feb 16 00:53:39 CET 2004
>>
>>I built few kernels from saturday morning to sunday evening and with all
>>of them i got this panic ..  (my last functional kernel is from FreeBSD
>>5.2-CURRENT #0: Mon Feb 9 19:53:47 CET 2004)  Jiri
>>    
>>
>
>It looks like 'ifp' in ip_output.c is NULL here (the offset of if_hwassist
>is 0x98).  Are you running with DUMMYNET?  I'm wondering if the recent
>commit to clean up MT_TAG pseudo-mbufs has a loose end somewhere.  Try
>backing ouf the following commit locally:
>
>mlaier      2004/02/13 11:14:16 PST
>
>  FreeBSD src repository
>
>  Modified files:
>    sys/net              bridge.c if_ethersubr.c 
>    sys/netinet          in_proto.c ip_divert.c ip_dummynet.c 
>                         ip_dummynet.h ip_fastfwd.c ip_fw.h 
>                         ip_fw2.c ip_input.c ip_output.c ip_var.h 
>                         tcp_debug.c tcp_input.c 
>    sys/sys              mbuf.h 
>  Added files:
>    sys/netinet          ip_divert.h 
>
>  
>
yes I'm runnig DUMMYNET

>Also, it would be quite interesting to see the contents of 'inspect *m'
>and 'inspect *ro' in stack frame #6.
>
>  
>
~~~cut~~~
(kgdb) up 6
#6  0xc05726c8 in ip_output (m=0xc10f7200, opt=0x0, ro=0xc2abab68, 
flags=1, imo=0x0, inp=0x0) at /usr/src/sys/netinet/ip_output.c:983
983             sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_hwassist;
(kgdb) inspect *m
$1 = {m_hdr = {mh_next = 0x0, mh_nextpkt = 0x0, mh_data = 0xc10f7250 
"E", mh_len = 48, mh_flags = 2, mh_type = 1}, M_dat = {MH = {
      MH_pkthdr = {rcvif = 0xc27b4000, len = 48, header = 0x14, 
csum_flags = 1, csum_data = 393990, tags = {slh_first = 0x0}}, MH_dat = {
        MH_ext = {ext_buf = 0x1020108---Can't read userspace from dump, 
or kernel process---

(kgdb) inspect *ro
$2 = {ro_rt = 0x0, ro_dst = {sa_len = 0 '\0', sa_family = 0 '\0', 
sa_data = '\0' <repeats 13 times>}}
~~~cut~~~

is it all ?
thanks
Jiri