Re: [Xen-devel] [PATCH] sched: fix race between sched_move_domain() and vcpu_wake()

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

create ^
title it credit2: init_pcpu doesn't grab runqueue lock before pointing
pcpu schedule_lock to it
thanks

On Fri, Oct 11, 2013 at 1:20 PM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>>>> On 11.10.13 at 11:32, "Jan Beulich" <JBeulich@xxxxxxxx> wrote:
>> I suppose you scanned the code for other cases like this, and
>> there are none?
>
> Actually I did just now, and I think there's a similar issue in
> credit2's init_pcpu(): After taking pcpu_schedule_lock(cpu) it
> alters schedule_lock and hence effectively drops the locking,
> yet continues to do other stuff before in fact releasing it.
>
> What is being done prior to unlocking, however, looks to be
> unrelated to the lock being held, and rather independently
> (of the effective releasing) wanting &rqd->lock held.
>
> Jan
>
>
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