linux-kernel - Re: xterm loses data (pty regression)

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Message-ID: <20090810182743.1642217f@lxorguk.ukuu.org.uk>
Date:	Mon, 10 Aug 2009 18:27:43 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Ray Lee <ray-lk@...rabbit.org>,
	Artur Skawina <art.08.09@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: xterm loses data (pty regression)

On Mon, 10 Aug 2009 10:18:41 -0700 (PDT)
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> 
> 
> On Mon, 10 Aug 2009, Ray Lee wrote:
> > On Mon, Aug 10, 2009 at 8:29 AM, Artur Skawina <art.08.09@...il.com> wrote:
> > >
> > > First noticed it after upgrading to v2.6.31-rc5-246-g90bc1a6, still happens
> > > in rc5-381-g7b2aa03.
> > > If i press ^S in an xterm the output stops as expected, but after a ^Q i see
> > > only the newly written data, everything in between is lost. 
> 
> Yup, I can confirm that. 
> 
> > > > for i in `seq 1 111`; do echo $i; sleep 1; done
> 
> (Do ^S/^Q, see data loss)
> 
> Will take a look asap, thanks. Although I bet it's the same old commit 
> (d945cb9cc: "pty: Rework the pty layer to use the normal buffering logic") 
> again.

My guess too. The old pty code abuses throttle/unthrottle in odd ways.
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