Re: fork() && ftrace_graph_exit_task()

From: Frederic Weisbecker
Date: Sun May 24 2009 - 18:16:53 EST

On Thu, May 21, 2009 at 09:53:30PM +0200, Oleg Nesterov wrote:
> What if the task with ->ret_stack != NULL calls fork(), and
> copy_prcoess() fails after successfull dup_task_struct() ?
> bad_fork_free: -> free_task()->ftrace_graph_exit_task() will
> free the parent's ->ret_stack copied by arch_dup_task_struct(),
> no?
> Oleg.

Good catch, that's a rare situation but very dangerous.

I will fix it, thanks for your report!


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