Messages in this thread | | | Date | Sun, 16 Feb 2003 20:37:17 +0100 | From | Manfred Spraul <> | Subject | Re: more signal locking bugs? |
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Linus Torvalds wrote:
>In short, everything really seems to be pointing that way: the current >task lock simply _is_ broken, and has apparently always been broken (but >the ABBA deadlock is just extremely rare in practice, since you have to >get an interrupt at just the right point on one CPU, while you have the AB >case on another).\ > ABBA is not a deadlock, because linux read_locks permit recursive calls.
read_lock(tasklist_lock); task_lock(tsk); read_lock(tasklist_lock);
Does not deadlock, nor any other ordering.
The tasklist_lock is never taken for write from bh or irq context.
-- Manfred
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