linux-kernel - fork() && ftrace_graph_exit

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Message-ID: <20090521195330.GA13604@redhat.com>
Date:	Thu, 21 May 2009 21:53:30 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org
Subject: fork() && ftrace_graph_exit_task()

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.

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