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由 Oleg Nesterov 提交于
It is not possible to find a sub-thread in ->children/->ptrace_children lists, ptrace_attach() does not allow to attach to sub-threads. Even if it was possible to ptrace the task from the same thread group, we can't allow to release ->group_leader while there are others (ptracer) threads in the same group. Signed-off-by: NOleg Nesterov <oleg@tv-sign.ru> Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
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