Re: [RFC PATCH -tip 0/5] kprobes: Abolish jprobe APIs

[Steven Rostedt]

On Mon, 9 Oct 2017 09:33:50 -0600
Jonathan Corbet <corbet@xxxxxxx> wrote:

> >       will prevent the callback from being called again. But this wrapper
> >       adds some overhead, and if the callback is safe from recursion,
> >       it can set this flag to disable the ftrace protection.  
> 
> What happens if you mark a function safe and it recurses anyway?  Say, if
> somebody else has hooked a different function unknown to the current
> caller? 

Oh, if another callback is attached to a function that gets called
within this function, that is fine. In fact I do that all the time. The
problem is if the callback gets called again and then goes into a
recursive loop.

-- Steve