linux-kernel - Re: [2.6.33-rc5] starting emacs makes lockdep warning

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Message-Id: <20100126144641.5AB3.A69D9226@jp.fujitsu.com>
Date:	Tue, 26 Jan 2010 14:49:12 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Al Viro <viro@...IV.linux.org.uk>,
	Tavis Ormandy <taviso@...gle.com>,
	Jeff Dike <jdike@...toit.com>, Julien Tinnes <jln@...gle.com>,
	Matt Mackall <mpm@...enic.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Americo Wang <xiyou.wangcong@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [2.6.33-rc5] starting emacs makes lockdep warning

> > On Tue, Jan 26, 2010 at 11:20 AM, KOSAKI Motohiro
> > <kosaki.motohiro@...fujitsu.com> wrote:
> > > Hi
> > >
> > > Current linus tree made following lockdep warning when starting emacs command.
> > > Is this known issue?
> > >
> > >
> > > =========================================================
> > > [ INFO: possible irq lock inversion dependency detected ]
> > > 2.6.33-rc5 #77
> > > ---------------------------------------------------------
> > > emacs/1609 just changed the state of lock:
> > >  (&(&tty->ctrl_lock)->rlock){+.....}, at: [<ffffffff8127c648>] tty_fasync+0xe8/0x190
> > > but this lock took another, HARDIRQ-unsafe lock in the past:
> > >  (&(&sighand->siglock)->rlock){-.....}
> > >
> > > and interrupts could create inverse lock ordering between them.
> > >
> > >
> > 
> > Hey,
> > 
> > does reverting commit 703625118 help?
> 
> Seems solved.
> 
> Thanks.

I'm sorry.
I forgot to cc related person at last mail.

Greg, can you please consider revert commit 703625118?




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