linux-kernel - Re: [PATCH 4/7] hvc_console: Fix race between hvc_close and hvc

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Date:	Wed, 24 Mar 2010 16:27:10 +0530
From:	Amit Shah <amit.shah@...hat.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg KH <greg@...ah.com>, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org, Rusty Russell <rusty@...tcorp.com.au>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH 4/7] hvc_console: Fix race between hvc_close and
	hvc_remove

On (Wed) Mar 24 2010 [21:45:44], Benjamin Herrenschmidt wrote:
> On Sun, 2010-03-21 at 08:04 +1100, Benjamin Herrenschmidt wrote:
> > On Fri, 2010-03-19 at 08:18 -0700, Greg Kroah-Hartman wrote:
> > > From: Amit Shah <amit.shah@...hat.com>
> > > 
> > > Alan pointed out a race in the code where hvc_remove is invoked. The
> > > recent virtio_console work is the first user of hvc_remove().
> > 
> > This causes hangs during boot on pseries machines. Haven't had a chance
> > to track that down yet, but please revert
> > e74d098c66543d0731de62eb747ccd5b636a6f4c for now.
> 
> Linus, any chance you can revert that one for now until we figure out
> what's wrong ?

Ben, can you confirm if the lockup you see is also due to the
task_is_waking() issue I found in a kvm guest?

That'll help me debug the issue.

Thanks.

		Amit
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