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SubjectRe: Linux 3.6-rc4
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On Fri, 2012-09-07 at 11:39 -0700, Linus Torvalds wrote:
> Al? Please look into this. I'm not entirely sure what's going on, but
> lockdep complains about this:
>
> Possible interrupt unsafe locking scenario:
>
> CPU0 CPU1
> ---- ----
> lock(&(&p->alloc_lock)->rlock);
> local_irq_disable();
> lock(&(&new_timer->it_lock)->rlock);
> lock(tasklist_lock);
> <Interrupt>
> lock(&(&new_timer->it_lock)->rlock);
>
> *** DEADLOCK ***
>
> and it looks real. IOW, if I read that right, we have the task_lock ->
> it_lock dependency through exit_itimers(), and then we have the
> tasklist_lock -> task_lock dependency everywhere else. So now it_lock
> -> tasklist_lock becomes a deadlock.

Agreed, I've got the following series from Oleg queued to solve this:

http://marc.info/?l=linux-kernel&m=134600821828491&w=2




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