linux-kernel - Re: WARNING: at net/ipv4/tcp_input.c:2173 tcp_mark_head

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Date:	Fri, 04 Apr 2008 12:09:25 -0400
From:	Tony Lill <ajlill@...c.waterloo.on.ca>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Robin H. Johnson" <robbat2@...too.org>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: WARNING: at net/ipv4/tcp_input.c:2173
 tcp_mark_head_lost+0x173/0x1a0()

Andrew Morton <akpm@...ux-foundation.org> writes:

> (cc netdev)
>
> (and Rafael - I assume 2.6.24 didn't do this..)
>
> On Wed, 2 Apr 2008 15:41:37 -0700 "Robin H. Johnson" <robbat2@...too.org> wrote:
>
>> (Please CC, not on LKML).
>> 
>> One of the nodes in my web-serving cluster (isohunt.com) started showing this:
>> 
>> ------------[ cut here ]------------
>> WARNING: at net/ipv4/tcp_input.c:2173 tcp_mark_head_lost+0x173/0x1a0()
>> Modules linked in: lm85 hwmon_vid nfs lockd nfs_acl sunrpc bonding reiserfs k8temp hwmon i2c_nforce2 i2c_core sg
>> Pid: 32500, comm: php-cgi Not tainted 2.6.25-rc4-git2 #7

Are you talking about the warning in this particular module, or
WARNINGS in tcp_input.c (and tcp_output.c) in general. 'Cause I've
been getting them sporadically since moving from 2.6.23 to 2.6.24.
At least I think that's the timeframe.

Mar 28 23:42:40 matrix kernel: WARNING: at net/ipv4/tcp_output.c:1799 tcp_simple_retransmit()
Mar 29 01:03:32 matrix kernel: WARNING: at net/ipv4/tcp_input.c:2413 tcp_fastretrans_alert()
Mar 29 01:12:41 matrix kernel: WARNING: at net/ipv4/tcp_input.c:1675 tcp_enter_frto()
Mar 29 03:03:04 matrix kernel: WARNING: at net/ipv4/tcp_input.c:2960 tcp_process_frto()
Mar 29 03:03:04 matrix kernel: WARNING: at net/ipv4/tcp_input.c:2314 tcp_try_to_open()

No user visble effects, and no messages since.

-tony
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