linux-kernel - Re: [BUG] 2.6.38-rc2: Circular Locking Dependency

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Message-Id: <20110206.232856.246531984.davem@davemloft.net>
Date:	Sun, 06 Feb 2011 23:28:56 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	Knut_Petersen@...nline.de
Cc:	linux-kernel@...r.kernel.org, paulus@...ba.org,
	mostrows@...thlink.net, linux-ppp@...r.kernel.org
Subject: Re: [BUG] 2.6.38-rc2: Circular Locking Dependency

From: Knut Petersen <Knut_Petersen@...nline.de>
Date: Mon, 24 Jan 2011 10:25:55 +0100

> As I was hunting something different I found the following (potential)
> problem on an openSuSE 11.3 system with kernel 2.6.38-rc2.
> The message is triggerd by smpppd starting a dsl connection.
> 
> Knut
> 
> 
>  NET: Registered protocol family 24
> 
>  =======================================================
>  [ INFO: possible circular locking dependency detected ]
>  2.6.38-rc2-kape #7
>  -------------------------------------------------------
>  pppd/2529 is trying to acquire lock:
>   (&(&pch->downl)->rlock){+.....}, at: [<f814a634>] ppp_push+0x59/0x4a8
> [ppp_generic]
> 
>  but task is already holding lock:
>   (&(&ppp->wlock)->rlock){+.-...}, at: [<f814ae1b>]
> ppp_xmit_process+0x19/0x451 [ppp_generic]
> 
>  which lock already depends on the new lock.

I've stared over this trace several times and can't figure out what
the problem is.

Paul, any idea?
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