netdev - Re: Three TCP/IP warnings in 2.6.25-rc7-git1

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Date:	Wed, 02 Apr 2008 22:21:09 -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: Re: Three TCP/IP warnings in 2.6.25-rc7-git1

Arjan van de Ven wrote:
> 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.


the warnings below are still present in 2.6.25-rc8.....

It would be not so nice to ship a 2.6.25 that triggers these frequently,
it has the risk of causing many user bugreports to this list and other
places...

> 
> 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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