Oleg Nesterov <[email protected]> writes:
> "Eric W. Biederman" wrote:
>>
>> Oleg Nesterov <[email protected]> writes:
>>
>> > Some questions.
>> >
>> > first_tgid:
>> > ...
>> > for (; pos && pid_alive(pos); pos = next_task(pos))
>> >
>> > I think this patch makes this 'pid_alive(pos)' unneeded?
>>
>> Close. The problem is that we could have slept with the
>> count elevated on start before we do rcu_read_lock().
>
> Yes, we could have slept. But (unlike next_tgid) this loop
> starts from pos=init_task or from pos=find_task_by_pid()
> and we are doing find_task_by_pid under rcu_read_lock() ?
Yes. We are sorry. The bits of code blurred in the discussion.
Eric
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