Re: [PATCH] fix console change race exposed by CFS

[Ingo Molnar]

* Jan Luebbe <jluebbe@xxxxxxxxx> wrote:

> From: Jan Lübbe <jluebbe@xxxxxxxxx>
> 
> The new behaviour of CFS exposes a race which occurs if a switch is
> requested when vt_mode.mode is VT_PROCESS.
> 
> The process with vc->vt_pid is signaled before vc->vt_newvt is set. This
> causes the switch to fail when triggered by the monitoing process
> because the target is still -1.
> 
> Signed-off-by: Jan Lübbe <jluebbe@xxxxxxxxx>

nifty! I'm wondering what the symptoms of this bug were - how did you 
notice it? Also, i'm wondering how you managed to debug this - looks 
quite hard to trigger this race, right?

Acked-by: Ingo Molnar <mingo@xxxxxxx>

	Ingo
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