linux-kernel - Re: WARNING: at drivers/tty/tty

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Date:	Mon, 11 Feb 2013 09:42:30 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	Michael Ellerman <michael@...erman.id.au>
Cc:	Jiri Slaby <jslaby@...e.cz>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: WARNING: at drivers/tty/tty_buffer.c:476  (tty is NULL)

Hi Michael,

On Mon, 2013-02-11 at 13:44 +1100, Michael Ellerman wrote:
> On Wed, Jan 30, 2013 at 01:33:57PM -0500, Peter Hurley wrote:
> > On Sat, 2013-01-19 at 22:00 +0100, Jiri Slaby wrote:
> > > On 01/18/2013 10:07 PM, Greg Kroah-Hartman wrote:
> > > > Jiri, was there anything on the mailing list that I missed that should
> > > > have resolved this issue?  I thought it was being worked on, but I can't
> > > > seem to find any resolution at the moment.
> > > 
> > > Somebody had a patchset and promised to repost IIRC. I forgot his name
> > > though.
> > > 
> > > /me back from digging in the mail history.
> > > 
> > > Peter Hurley is the name.
> > > 
> > > Peter, what happened with your patches in the end, please?
> > 
> > The tty subsystem is very resilient to fixing :)
> > 
> > The thing I'm working on right now -- which hopefully is the last issue
> > with the line discipline logic -- occurs with parallel __tty_hangup()
> > and tty_release().
> > 
> > At the moment, I'm trying to narrow the conditions when this happens.
> 
> If it helps I seem to be able to reproduce this in just a few seconds by
                                   ^^^^^^^^^^^^^^
                 you get this WARNING from a parallel __tty_hangup?

Or do you mean simply that you get this WARNING?

> running trinity and hitting Ctrl-C to quit the watchdog.

Can you reproduce after using the following patch series?
[PATCH v3 00/23] ldisc fixes

Regards,
Peter Hurley

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