From: David Miller <davem@davemloft.net>
To: Knut_Petersen@t-online.de
Cc: linux-kernel@vger.kernel.org, paulus@samba.org,
mostrows@earthlink.net, linux-ppp@vger.kernel.org
Subject: Re: [BUG] 2.6.38-rc2: Circular Locking Dependency
Date: Mon, 07 Feb 2011 07:28:56 +0000 [thread overview]
Message-ID: <20110206.232856.246531984.davem@davemloft.net> (raw)
In-Reply-To: <4D3D45A3.7040809@t-online.de>
From: Knut Petersen <Knut_Petersen@t-online.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?
next prev parent reply other threads:[~2011-02-07 7:28 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-24 9:25 [BUG] 2.6.38-rc2: Circular Locking Dependency Knut Petersen
2011-02-07 7:28 ` David Miller [this message]
2011-02-07 10:29 ` Paul Mackerras
2011-02-07 10:43 ` Paul Mackerras
2011-02-08 7:51 ` Knut Petersen
2011-02-08 8:07 ` David Miller
2011-02-08 23:04 ` David Miller
2011-02-09 7:26 ` Knut Petersen
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