Re: panic: bad TCP data offset 24 (tlen 22)
Hello Joe. Jeff and I have been looking at it. It looks like your
panic occured after a fragmented packet got reassembled.
Are you running any special protocols, like IPSEC or anything like
that?
If you have a kernel core still around we may need it to help diagnose
the problem.
-Matt
Matthew Dillon
<dillon@backplane.com>
:My box crashed today with the following panic:
:
:panic: bad TCP data offset 24 (tlen 22)
:
:I was experiencing some packet loss just prior to the crash. I was
:running nmap on my access points IP address and stepped away for a
:minute. When I returned Xorg was frozen, no keyboard or mouse
:response then the machine rebooted.
:
:$uname -a
:DragonFly <hostname> 1.1-Stable DragonFly 1.1-Stable #7: Mon Mar 14
:11:24:00 EST 2005 root@<hostname>:/usr/obj/usr/src/sys/SOL i386
:
:panic messages:
:---
:panic: bad TCP data offset 24 (tlen 22)
:
:(kgdb) bt
:#0 dumpsys () at /usr/src/sys/kern/kern_shutdown.c:508
:#1 0xc01abee7 in boot (howto=256) at
:/usr/src/sys/kern/kern_shutdown.c:341
:#2 0xc01ac318 in panic (fmt=0xc036aee0 "bad TCP data offset %d (tlen
:%d)")
: at /usr/src/sys/kern/kern_shutdown.c:620
:#3 0xc0213dbd in tcp_input (m=0xc28c3200)
: at /usr/src/sys/netinet/tcp_input.c:635
:#4 0xc020f181 in transport_processing_oncpu (m=0xc28c3200, hlen=20,
: ip=0xded5100e, nexthop=0x0) at /usr/src/sys/netinet/ip_input.c:423
:#5 0xc020fa90 in ip_input (m=0xc28c3200)
: at /usr/src/sys/netinet/ip_input.c:1112
:#6 0xc020f1df in ip_input_handler (msg0=0xc2749300)
: at /usr/src/sys/netinet/ip_input.c:454
:#7 0xc0218502 in tcpmsg_service_loop (dummy=0x0)
: at /usr/src/sys/netinet/tcp_subr.c:391
:#8 0xc01b0f84 in lwkt_create () at /usr/src/sys/kern/lwkt_thread.c:1260
:
:Let me know if more info is needed.
:
:Thanks,
:Joe
:
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