linux-kernel - Re: [PATCH v15 1/2] Reorganize the oom report in dump

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Message-ID: <20181101103050.GG23921@dhcp22.suse.cz>
Date:   Thu, 1 Nov 2018 11:30:50 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     禹舟键 <ufo19890607@...il.com>
Cc:     akpm@...ux-foundation.org, rientjes@...gle.com,
        kirill.shutemov@...ux.intel.com, aarcange@...hat.com,
        penguin-kernel@...ove.sakura.ne.jp, guro@...com,
        yang.s@...baba-inc.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Wind Yu <yuzhoujian@...ichuxing.com>
Subject: Re: [PATCH v15 1/2] Reorganize the oom report in dump_header

On Thu 01-11-18 18:09:39, 禹舟键 wrote:
> Hi Michal
> The null pointer is possible when calling the dump_header, this bug was
> detected by LKP. Below is the context 3 months ago.

Yeah I remember it was 0day report but I coundn't find it in my email
archive. Do you happen to have a message-id?

Anyway
        if (__ratelimit(&oom_rs))
                dump_header(oc, p);
+       if (oc)
+               dump_oom_summary(oc, victim);

Clearly cannot solve any NULL ptr because oc is never NULL unless I am
missing something terribly.
-- 
Michal Hocko
SUSE Labs