panic: bad TCP data offset 24 (tlen 22)
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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