linux-kernel - Re: BUG_ON(!PageLocked(page)) in munlock_vma_page/migrate_pages/__block_write

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Message-ID: <20151215194213.GA15672@cmpxchg.org>
Date:	Tue, 15 Dec 2015 14:42:13 -0500
From:	Johannes Weiner <hannes@...xchg.org>
To:	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Eric B Munson <emunson@...mai.com>,
	David Rientjes <rientjes@...gle.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Jeff Vander Stoep <jeffv@...gle.com>,
	Alexander Kuleshov <kuleshovmail@...il.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	Hugh Dickins <hughd@...gle.com>,
	syzkaller <syzkaller@...glegroups.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: BUG_ON(!PageLocked(page)) in
 munlock_vma_page/migrate_pages/__block_write_begin

Hi Dmitry,

On Tue, Dec 15, 2015 at 08:23:34PM +0100, Dmitry Vyukov wrote:
> I am seeing lots of similar BUGs in different functions all pointing
> to BUG_ON(!PageLocked(page)). I reproduced them on several recent
> commits, including stock 6764e5ebd5c62236d082f9ae030674467d0b2779 (Dec
> 9) with no changes on top and no KASAN/etc.

This should be fixed in newer kernels with this commit: 
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=dfd01f026058a59a513f8a365b439a0681b803af
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