linux-kernel - Re: [Bug #14388] keyboard under X with 2.6.31

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Message-ID: <20091017164042.GC1423@ucw.cz>
Date:	Sat, 17 Oct 2009 18:40:42 +0200
From:	Pavel Machek <pavel@....cz>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Nix <nix@...eri.org.uk>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Paul Fulghum <paulkf@...rogate.com>,
	"Justin P. Mattock" <justinmattock@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Boyan <btanastasov@...oo.co.uk>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Ed Tomlinson <edt@....ca>,
	"Fr?d?ric L. W. Meunier" <fredlwm@...il.com>,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Subject: Re: [Bug #14388] keyboard under X with 2.6.31

Hi!

> Comments? Does this work? Does it make any difference? It seems fairly 
> unlikely, but it's the only obvious problem I've seen in the tty buffering 
> code so far.
> 
> And that code is literally 3 years old, and it seems unlikely that a 
> regular _keyboard_ buffer would be able to hit the (rather small) race 
> condition. But other serialization may have hidden it, and timing 
> differences could certainly have caused it to trigger much more easily.

I use this (run as root) to trigger various problems in this
area... (portable between i386 and i386).

								Pavel

void
main(void)
{
	int i;
	iopl(3);
	while (1) {
		asm volatile("cli");
		//		for (i=0; i<20000000; i++)
		for (i=0; i<1000000000; i++)
			asm volatile("");
		asm volatile("sti");
		sleep(1);
	}
}


-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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