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

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Date:	Sat, 18 Aug 2007 07:13:50 +0200
From:	Willy Tarreau <w@....eu>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Authenticated <NWQ3MzhlY2QwZDAzODVhN@...udten.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Kernel 2.6.20:  INFO: possible circular locking dependency detected

On Thu, Aug 16, 2007 at 09:23:48PM +0100, Alan Cox wrote:
> 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.

Is there any known unmerged fix for this one ?

Willy

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