linux-kernel - Re: [PATCH] fork, memcg: fix cached

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Message-ID: <a8e412e9e0983b380983099af9a90b9760f0edae.camel@surriel.com>
Date:   Fri, 04 Jan 2019 15:14:45 -0500
From:   Rik van Riel <riel@...riel.com>
To:     Shakeel Butt <shakeelb@...gle.com>, Roman Gushchin <guro@...com>,
        Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>,
        Tejun Heo <tj@...nel.org>, stable@...r.kernel.org
Subject: Re: [PATCH] fork, memcg: fix cached_stacks case

On Wed, 2019-01-02 at 10:01 -0800, Shakeel Butt wrote:
> Commit 5eed6f1dff87 ("fork,memcg: fix crash in free_thread_stack on
> memcg charge fail") fixes a crash caused due to failed memcg charge
> of
> the kernel stack. However the fix misses the cached_stacks case which
> this patch fixes. So, the same crash can happen if the memcg charge
> of
> a cached stack is failed.
> 
> Fixes: 5eed6f1dff87 ("fork,memcg: fix crash in free_thread_stack on
> memcg charge fail")
> Signed-off-by: Shakeel Butt <shakeelb@...gle.com>
> Cc: Rik van Riel <riel@...riel.com>
> Cc: Roman Gushchin <guro@...com>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: <stable@...r.kernel.org>

Good catch. Thank you.

Acked-by: Rik van Riel <riel@...riel.com>

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