Oleg Nesterov <[email protected]> wrote:
> Do you see any reason for tasklist_lock here (and in elf_core_dump) ?
>
> do_each_thread() is rcu-safe, and all tasks which use this ->mm must
> sleep in wait_for_completion(&mm->core_done) at this point.
Hmmm... do_each_thread() does not call rcu_read_lock/unlock(), but you may
well be right. What about kernel threads running on another CPU with
active_mm set to this mm (assuming I'm remembering correctly how that works)?
I'm not sure they'd be a problem, though.
It does sound like you've got a valid point, though.
David
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