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

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Date:	Mon, 10 Aug 2009 10:07:35 -0700
From:	Ray Lee <ray-lk@...rabbit.org>
To:	Artur Skawina <art.08.09@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: xterm loses data (pty regression)

[ adding CC:s ]

On Mon, Aug 10, 2009 at 8:29 AM, Artur Skawina <art.08.09@...il.com> wrote:
>
> [I have now gone back to 2.6.30.3 and the writes to the ptys do block there,
>  so it's a recent regression.]
>
> 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. Like:
>
> > for i in `seq 1 111`; do echo $i; sleep 1; done
> 1
> 2
> 3
> 4
> 9
> 10
> 11
> 12
> 13
> ^C
>
> [typed ^S after '4', then ^Q after a few seconds]
>
> If the command doing the printing exits before the ^Q is sent, i don't get
> any reaction to the ^Q at all, which is why i initially thought it to be an
> xserver bug.
> Text consoles are unaffected, output resumes as it should.
>
> artur
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