Messages in this thread | | | From | Sasha Levin <> | Date | Sun, 18 Nov 2012 23:05:04 -0500 | Subject | Re: yama: lockdep warning on yama_ptracer_del |
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Hi Kees,
On Thu, Oct 18, 2012 at 6:39 PM, Kees Cook <keescook@chromium.org> wrote: > On Wed, Oct 17, 2012 at 8:10 PM, Sasha Levin <sasha.levin@oracle.com> wrote: >> Hi all, >> >> I was fuzzing with trinity within a KVM tools guest (lkvm) on a linux-next kernel, and got the >> following dump which I believe to be noise due to how the timers work - but I'm not 100% sure. >> ... >> [ 954.674123] Possible interrupt unsafe locking scenario: >> [ 954.674123] >> [ 954.674123] CPU0 CPU1 >> [ 954.674123] ---- ---- >> [ 954.674123] lock(ptracer_relations_lock); >> [ 954.674123] local_irq_disable(); >> [ 954.674123] lock(&(&new_timer->it_lock)->rlock); >> [ 954.674123] lock(ptracer_relations_lock); >> [ 954.674123] <Interrupt> >> [ 954.674123] lock(&(&new_timer->it_lock)->rlock); >> [ 954.674123] >> [ 954.674123] *** DEADLOCK *** > > I've been wanting to get rid of the Yama ptracer_relations_lock > anyway, so maybe I should do that now just to avoid this case at all?
I still see this one in -rc6, is there anything to get rid of it before the release?
Thanks, Sasha
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