linux-kernel - Re: [mm 4.15-rc8] Random oopses under memory pressure.

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Message-ID: <20180120093808.7mol6d7jkngy22ky@ltop.local>
Date:   Sat, 20 Jan 2018 10:38:10 +0100
From:   Luc Van Oostenryck <luc.vanoostenryck@...il.com>
To:     Al Viro <viro@...IV.linux.org.uk>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Tony Luck <tony.luck@...el.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...nel.org>,
        "hillf.zj" <hillf.zj@...baba-inc.com>,
        Hugh Dickins <hughd@...gle.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Rik van Riel <riel@...hat.com>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        sparse mailing list <linux-sparse@...r.kernel.org>
Subject: Re: [mm 4.15-rc8] Random oopses under memory pressure.

On Sat, Jan 20, 2018 at 05:24:32AM +0000, Al Viro wrote:
> On Sat, Jan 20, 2018 at 02:02:37AM +0000, Al Viro wrote:
> 
> > Note that those sizes are rather sensitive to lockdep, spinlock debugging, etc.
> 
> That they certainly are: on one of the testing .config I'm using it gave this:
>    1104 sizeof struct page = 56

Yes, I get this already with defconfig.
It's a problem with sparse which ignore the alignment attribute
(in fact all 'trailing' attributes in type declarations).

I'm looking to fix it.

-- Luc Van Oostenryck