Re: [PATCH] ftrace: do_each_pid_task() needs rcu lock

[Ingo Molnar]

* Oleg Nesterov <oleg@xxxxxxxxxx> wrote:

> "ftrace: use struct pid" commit 978f3a45d9499c7a447ca7615455cefb63d44165
> converted ftrace_pid_trace to "struct pid*". But we can't use
> do_each_pid_task() without rcu_read_lock() even if we know the pid
> itself can't go away (it was pinned in ftrace_pid_write). The exiting
> task can detach itself from this pid at any moment.
> 
> Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>

Applied to tip/tracing/urgent (for v2.6.29), thanks Oleg!

	Ingo
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