Re: bug in tty ldisc and friends

From: Ingo Molnar
Date: Tue Jun 16 2009 - 04:50:51 EST

* Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> wrote:

> On Tue, 16 Jun 2009 01:45:36 -0400 (EDT)
> Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
> > [ Ingo and Andrew, sorry for the repost, but I forgot to Cc LKML and I
> > also used Alan's old email. ]
> >
> > I can easily trigger a bug in the tty code by enabling the event
> > tracers.
> Yes I know. I sent Linus a temporary workaround yesterday. The bug
> is as old as the hills (the race in various forms predates any git
> or bk history!). The ldisc changes happened to make it more
> visible.
> Unfortunately its non trivial to fix but the workaround should
> make it as hard to hit now as in 2.6.30 while I sort the funnies
> out. Really though I need the lock verifier working to do that,
> and its been busted since 2.6.30 8(

Hm, have you tried the patch i sent to you that extends the
number-lock-locks-tracked limit you have run into? It is trivial.

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