On 04/24, Eric W. Biederman wrote:
>
> The NULL vfork_done is really weird as exec is the only thing that sets
> vfork_done to NULL.
Hm, mm_release() clears ->vfork_done before complete().
mm_release:
struct completion *vfork_done = tsk->vfork_done;
if (vfork_done) {
tsk->vfork_done = NULL;
complete(vfork_done);
}
kthread_stop:
set_tsk_thread_flag(tsk, TIF_KTHREAD_STOP);
signal_wake_up(tsk, 1);
// tsk exits, sets ->vfork_done == NULL
wait_for_completion(tsk->vfork_done);
Probably Rafael worried about this, but I misunderstood him...
Oleg.
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