linux-kernel - Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

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Message-ID: <alpine.LFD.2.20.1602151736120.1820@schleppi>
Date:	Mon, 15 Feb 2016 17:38:43 +0100 (CET)
From:	Sebastian Ott <sebott@...ux.vnet.ibm.com>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
cc:	Gerald Schaefer <gerald.schaefer@...ibm.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	linuxppc-dev@...ts.ozlabs.org,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	linux-arm-kernel@...ts.infradead.org,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux-s390@...r.kernel.org
Subject: Re: [BUG] random kernel crashes after THP rework on s390 (maybe also
 on PowerPC and ARM)

On Mon, 15 Feb 2016, Kirill A. Shutemov wrote:
> > [   59.851421] list_del corruption. next->prev should be 000000006e1eb000, but was 0000000000000400
> 
> This kinda interesting: 0x400 is TAIL_MAPPING.. Hm..
> 
> Could you check if you see the problem on commit 1c290f642101 and its
> immediate parent?

Both 1c290f642101 and 1c290f642101^ survived 20 compile runs each.

Sebastian