linux-kernel - Re: pty FIONREAD returning zero breaks emacs in 3.11rc3

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Message-ID: <20130813220314.GB19750@two.firstfloor.org>
Date:	Wed, 14 Aug 2013 00:03:14 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	gregkh@...uxfoundation.org, viro@...iv.linux.org.uk
Subject: Re: pty FIONREAD returning zero breaks emacs in 3.11rc3

On Mon, Aug 12, 2013 at 09:43:43PM -0400, Peter Hurley wrote:
> On 08/09/2013 05:11 PM, Andi Kleen wrote:
> >
> >When I run emacs over ssh terminal (no X) on 3.11-rc3 it often ignores key
> >strokes.  I first thought the system was busy or so, but when
> >stracing the emacs it was not blocked.
> 
> Andi,
> 
> More information might help me narrow this down since I can't
> reproduce this.
> 
> Is the ssh session remote?

Yes.

> Can you reproduce this on a local ssh session?

Yes.

> What version of emacs is this? Is it the nox flavor?

emacs-24.3-6.11.x86_64

It's emacs-gtk


> What distribution/version?

Current Tumbleweed

> What platform?

x86_64 2S Westmere

> 
> >Here's a typical sequence. select/SIGIO wakes it up, but then
> >FIONREAD returns 0.
> >
> >I'm not fully sure when it started.
> 
> In the 3.11 cycle? or could have started back on 3.9 or earlier?

Ok I tried and it actually happens on 3.9 too. For some reason 
I didn't notice it earlier (or blamed my bad typing)
Haven't tried earlier

> 
> Could you try to reproduce this on linux-next?

Happens on linux-next too.
> 
> Would you please attach the full strace of emacs from this session?

Attached (from a different session)

-Andi

Download attachment "log.xz" of type "application/octet-stream" (14428 bytes)