From mboxrd@z Thu Jan  1 00:00:00 1970
From: "=?ISO-8859-1?Q?Ilpo_J=E4rvinen?=" <ilpo.jarvinen@helsinki.fi>
Subject: Re: [bug] stuck localhost TCP connections, v2.6.26-rc3+
Date: Mon, 26 May 2008 17:58:51 +0300 (EEST)
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References: <20080526115628.GA31316@elte.hu> <Pine.LNX.4.64.0805261550340.16829@wrl-59.cs.helsinki.fi>
 <20080526135940.GB24870@elte.hu> <20080526141252.GA31352@elte.hu>
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Cc: LKML <linux-kernel@vger.kernel.org>,
	Netdev <netdev@vger.kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	"Rafael J. Wysocki" <rjw@sisk.pl>,
	Andrew Morton <akpm@linux-foundation.org>
To: Ingo Molnar <mingo@elte.hu>
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On Mon, 26 May 2008, Ingo Molnar wrote:

> there's a hung distcc task on the system, waiting for socket action 
> forever:
> 
>   [root@europe ~]# strace -fp 19578
>   Process 19578 attached - interrupt to quit
>   select(5, NULL, [4], [4], {82, 90000} <unfinished ...>

Hmm, readfds is NULL isn't it?!? Are you sure you straced the right 
process?

> disturbing that task via strace did not change the state of the socket - 
> and that's not unexpected as it's a select(). [TCP state might be 
> affected if strace impacted a recvmsg or a sendmsg wait directly.]

I fail to understand this paragraph due to excessive negation... :-)



-- 
 i.