linux-kernel - Re: Kernel 2.6.20: INFO: possible circular locking dependency detected

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Message-ID: <20070816212348.0d260d06@the-village.bc.nu>
Date:	Thu, 16 Aug 2007 21:23:48 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Authenticated <NWQ3MzhlY2QwZDAzODVhN@...udten.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Kernel 2.6.20:  INFO: possible circular locking dependency
 detected

On Thu, 16 Aug 2007 19:50:43 +0200
Authenticated <NWQ3MzhlY2QwZDAzODVhN@...udten.com> wrote:

> 
> =======================================================
> [ INFO: possible circular locking dependency detected ]
> 2.6.20-1.2948.self #1
> -------------------------------------------------------
> squid/4058 is trying to acquire lock:
>  (tty_mutex){--..}, at: [<c019fb54>] print_warning+0x8b/0x12e
> 
> but task is already holding lock:
>  (&s->s_dquot.dqptr_sem){----}, at: [<c01a0802>] dquot_alloc_inode+0x34/0x10a
> 
> which lock already depends on the new lock.

Yep - known 2.6.20 problem. Its very very unlikely to ever cause a real
problem however.
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