linux-kernel - Re: [PATCH v2 3/3] fs: Use delayed shrinker unregistration

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Message-Id: <20230608172722.d32733db433d385daa6c11a0@linux-foundation.org>
Date:   Thu, 8 Jun 2023 17:27:22 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Dave Chinner <david@...morbit.com>
Cc:     Theodore Ts'o <tytso@....edu>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Kirill Tkhai <tkhai@...ru>, vbabka@...e.cz,
        viro@...iv.linux.org.uk, brauner@...nel.org, djwong@...nel.org,
        hughd@...gle.com, paulmck@...nel.org, muchun.song@...ux.dev,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        zhengqi.arch@...edance.com
Subject: Re: [PATCH v2 3/3] fs: Use delayed shrinker unregistration

On Fri, 9 Jun 2023 09:17:54 +1000 Dave Chinner <david@...morbit.com> wrote:

> > Given that we're at -rc5 now, and the file system folks didn't get
> > consulted until fairly late in the progress, and the fact that this
> > may cause use-after-free problems that could lead to security issues,
> > perhaps we shoould consider reverting the SRCU changeover now, and try
> > again for the next merge window?
> 
> Yes, please, because I think we can fix this in a much better way
> and make things a whole lot simpler at the same time.

Qi Zheng, if agreeable could you please prepare and send reverts of
475733dda5a ("mm: vmscan: add shrinker_srcu_generation") and of
f95bdb700bc6bb74 ("mm: vmscan: make global slab shrink lockless")?

Thanks.