linux-kernel - Re: [bug] stuck localhost TCP connections, v2.6.26-rc3+

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Message-ID: <Pine.LNX.4.64.0805261745010.16829@wrl-59.cs.helsinki.fi>
Date:	Mon, 26 May 2008 17:58:51 +0300 (EEST)
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	Ingo Molnar <mingo@...e.hu>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [bug] stuck localhost TCP connections, v2.6.26-rc3+

On Mon, 26 May 2008, Ingo Molnar wrote:

> there's a hung distcc task on the system, waiting for socket action 
> forever:
> 
>   [root@...ope ~]# 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.
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