linux-kernel - Re: [Bug #14015] pty regressed again, breaking expect and gcc's testsuite

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Message-ID: <20090904162807.1dba7a32@lxorguk.ukuu.org.uk>
Date:	Fri, 4 Sep 2009 16:28:07 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Mikael Pettersson <mikpe@...uu.se>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Alan Cox <alan@...ux.intel.com>, Greg KH <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Bug #14015] pty regressed again, breaking expect and gcc's
 testsuite

> And if it _doesn't_ fix it, then I think we'll just have to revert the 
> commits in question. We won't have time to root-cause it if the above 
> isn't it.

In which case ppp will no longer work properly in some cases (ditto
other protocols) and things like the pppoe gateway wont work as they
don't in 2.6.30 - you need to go back to somewhere between 2.6.28/29 to
undo this, then apply the alternative locking patches to the
ppp/slip/ax25/etc ldiscs

Is the missing byte always part of the \r\n - that is handled slightly
specially by the n_tty ldisc code and has always been buggy if there is
flow control buffering - back to 1.3 and probably earlier. It happens on
real ttys too given sufficient flow control blockage because the char by
char opost stuff never did space/buffering checks. At least I don't think
the n_tty rework fixed it.
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