No, no, this is wrong.
tsk->signal->stats contains the accumulated info about the already exited
threads, we shouldn't throw it out.
Also, fill_tgid() doesn't make sense here, current is the last live sub-thread.
Hmm. We have another race here. There is no guarantee that tsk->signal->stats
covers all sub-threads, as it is supposed to be. It is quite possible that
another sub-thread decremented ->signal->live before us, but didn't complete
taskstats_exit()->fill_tgid_exit() yet.
Oleg.
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