linux-kernel - Re: [PATCH] thp: call pmdp_invalidate() with correct virtual address

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Date:	Wed, 24 Feb 2016 10:49:06 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Gerald Schaefer <gerald.schaefer@...ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Will Deacon <will.deacon@....com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	linux-s390 <linux-s390@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] thp: call pmdp_invalidate() with correct virtual address

On Wed, Feb 24, 2016 at 7:58 AM, Kirill A. Shutemov
<kirill.shutemov@...ux.intel.com> wrote:
> Sebastian Ott and Gerald Schaefer reported random crashes on s390.
> It was bisected to my THP refcounting patchset.
>
> The problem is that pmdp_invalidated() called with wrong virtual
> address. It got offset up by HPAGE_PMD_SIZE by loop over ptes.
>
> The solution is to introduce new variable to be used in loop and don't
> touch 'haddr'.

Thanks, I applied this directly rather than wait for this to go
through Andrew (which would have been "proper channels").

This issue has been worrying me for a while now and was my main core
worry for 4.5. Good to have it resolved, and thanks to everybody who
tested and got involved.

                 Linus