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

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

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