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Date:	Sun, 06 Feb 2011 23:28:56 -0800 (PST)
From:	David Miller <>
Subject: Re: [BUG] 2.6.38-rc2: Circular Locking Dependency

From: Knut Petersen <>
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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