linux-kernel - Re: [Stable 4.4 - NEEDS REVIEW - 1/3] mm: workingset: fix crash in shadow node shrinker caused by replace_page_cache

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Message-ID: <20161024185848.GD13148@dhcp22.suse.cz>
Date:   Mon, 24 Oct 2016 20:58:48 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     Stable tree <stable@...r.kernel.org>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Antonio SJ Musumeci <trapexit@...wn.link>,
        Miklos Szeredi <miklos@...redi.hu>
Subject: Re: [Stable 4.4 - NEEDS REVIEW - 1/3] mm: workingset: fix crash in
 shadow node shrinker caused by replace_page_cache_page()

On Mon 24-10-16 14:52:23, Johannes Weiner wrote:
> On Mon, Oct 24, 2016 at 05:26:03PM +0200, Michal Hocko wrote:
[...]
> > diff --git a/include/linux/swap.h b/include/linux/swap.h
> > index 7ba7dccaf0e7..b28de19aadbf 100644
> > --- a/include/linux/swap.h
> > +++ b/include/linux/swap.h
> > @@ -266,6 +266,7 @@ static inline void workingset_node_pages_inc(struct radix_tree_node *node)
> >  
> >  static inline void workingset_node_pages_dec(struct radix_tree_node *node)
> >  {
> > +	VM_BUG_ON(!workingset_node_pages(node));
> >  	node->count--;
> >  }
> 
> We should also pull 21f54ddae449 ("Using BUG_ON() as an assert() is
> _never_ acceptable") into stable on top of this patch to replace the
> BUG_ONs with warnings.
> 
> Otherwise this looks good to me.

OK, I have put that one on top and after the review will post it in one
series. Thanks for the review Johannes!

-- 
Michal Hocko
SUSE Labs