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

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Message-Id: <20100126142644.5AB0.A69D9226@jp.fujitsu.com>
Date:	Tue, 26 Jan 2010 14:37:08 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Americo Wang <xiyou.wangcong@...il.com>
Cc:	kosaki.motohiro@...fujitsu.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.



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