Re: [tip:tracing/syscalls] tracing/core: fix early free ofcpumasks

From: Steven Rostedt
Date: Wed Apr 01 2009 - 22:43:08 EST



On Thu, 2 Apr 2009, Ingo Molnar wrote:

>
> * Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
>
> > This never made it into 2.6.29, nor do I see it yet in mainline.
> >
> > This can cause unpredictable results with ftrace. We are freeing a
> > cpu mask that will be later used.
>
> Yes ... but CONFIG_OFFSTACK is only possible as a debug option right
> now. So it's far less serious of an issue, it needs 2-3 unlikely
> features to be combined.

And unfortunately for Johannes, he must have had all those features
configured :-/ He spent pretty much the entire day trying to figure out
why ftrace was broken.

-- Steve

>
> The fix looks simple enough, so once the tracing tree is upstream,
> we can forward it to -stable.
>
> Ingo
>
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