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

Pavel Machek
2009-10-17T16:40:42Z

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