netdev - Two TCP/IP warnings in 2.6.25-rc7-git1

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Date:	Mon, 31 Mar 2008 14:05:04 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	NetDev <netdev@...r.kernel.org>
CC:	ilpo.jarvinen@...sinki.fi, David Miller <davem@...emloft.net>
Subject: Two TCP/IP warnings in 2.6.25-rc7-git1

Hi,

kerneloops.org still has 3 tcp/ip related warnings in the top 15 of oopses/warnings
that users (mostly of Fedora 9 alpha/beta, but also LKML and netdev) see.
All three have been seen as recent as 2.6.25-rc7-git1, but seem to date back to around
2.6.24-rc4 era.

Number 1 is a WARN_ON in tcp_ack(), there are several backtraces at
http://www.kerneloops.org/search.php?search=tcp_ack but the core
comes down to the following:

tcp_ack
tcp_rcv_established
tcp_v4_do_rcv
tcp_v4_rcv
ip_local_deliver_finish
ip_local_deliver
ip_rcv_finish
ip_rcv
netif_receive_skb
tg3_poll or nv_napi_poll or the e1000 equivalent
net_rx_action
__do_softirq
do_softirq
irq_exit
do_IRQ


Number 2 is a WARN_ON in tcp_enter_frto(), backtraces at
http://www.kerneloops.org/search.php?search=tcp_enter_frto
the core backtrace comes down to

tcp_enter_frto
tcp_write_timer
run_timer_softirq
__do_softirq
do_softirq


Number 3 is a WARN_ON in tcp_mark_head+lost, backtraces at
http://www.kerneloops.org/search.php?search=tcp_mark_head_lost
the core backtrace comes down to

tcp_mark_head_lost
tcp_ack
tcp_rcv_established
tcp_v4_do_rcv
tcp_v4_rcv
ip_local_deliver_finish
ip_local_deliver
ip_rcv_finish
ip_rcv
netif_receive_skb
tg3_poll or nv_napi_poll
net_rx_action
__do_softirq


The URLs link to several mailinglist/bugzilla postings for these.
Note that not all backtraces have such a thing; a lot of these backtraces
are collected by an automated daemon and submitted directly from testers/users
systems to the database.
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