linux-kernel - Re: [PATCH v2 1/2] mm: Move page struct poisoning to CONFIG_DEBUG_VM_PAGE_INIT

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Message-ID: <c5dc8ef6-587d-e286-af80-568094a65007@intel.com>
Date:   Thu, 6 Sep 2018 10:07:51 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Pasha Tatashin <Pavel.Tatashin@...rosoft.com>,
        Alexander Duyck <alexander.duyck@...il.com>,
        "mhocko@...nel.org" <mhocko@...nel.org>
Cc:     linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
        "Duyck, Alexander H" <alexander.h.duyck@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH v2 1/2] mm: Move page struct poisoning to
 CONFIG_DEBUG_VM_PAGE_INIT_POISON

On 09/06/2018 09:12 AM, Pasha Tatashin wrote:
> 
> I do not want to make this feature less tested. Poisoning memory allowed
> us to catch corner case bugs like these:
> 
> ab1e8d8960b68f54af42b6484b5950bd13a4054b
> mm: don't allow deferred pages with NEED_PER_CPU_KM
> 
> e181ae0c5db9544de9c53239eb22bc012ce75033
> mm: zero unavailable pages before memmap init
> 
> And several more that were fixed by other people.

Just curious: were these found in the wild, or by a developer doing
normal development having turned on lots of debug options?