fork() && ftrace_graph_exit_task()

[Oleg Nesterov]

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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