Re: [PATCHv7 6/8] printk: use printk_safe buffers in printk

[Peter Zijlstra]

On Wed, Feb 01, 2017 at 10:06:25AM +0100, Jan Kara wrote:
> Clearly scheduler code (update_load_avg) calls WARN_ON from scheduler while
> holding rq_lock which has been always forbidden. Sergey and Petr were doing
> some work to prevent similar deadlocks but I'm not sure how far they
> went...

Its not forbidden, just can result in the occasional deadlock, meh.


In any case, there's a patch in tip fixing that warn trigger.