From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f43.google.com (mail-pa0-f43.google.com [209.85.220.43]) by kanga.kvack.org (Postfix) with ESMTP id A2A646B0038 for ; Tue, 1 Dec 2015 16:38:05 -0500 (EST) Received: by pacdm15 with SMTP id dm15so17316263pac.3 for ; Tue, 01 Dec 2015 13:38:05 -0800 (PST) Received: from mga02.intel.com (mga02.intel.com. [134.134.136.20]) by mx.google.com with ESMTP id a5si19835849pas.5.2015.12.01.13.38.04 for ; Tue, 01 Dec 2015 13:38:05 -0800 (PST) Date: Tue, 1 Dec 2015 23:38:01 +0200 From: "Kirill A. Shutemov" Subject: Re: mm: BUG in __munlock_pagevec Message-ID: <20151201213801.GA138207@black.fi.intel.com> References: <565C5C38.3040705@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <565C5C38.3040705@oracle.com> Sender: owner-linux-mm@kvack.org List-ID: To: Sasha Levin Cc: Vlastimil Babka , "linux-mm@kvack.org" , LKML On Mon, Nov 30, 2015 at 09:24:56AM -0500, Sasha Levin wrote: > Hi all, > > I've hit the following while fuzzing with trinity on the latest -next kernel: > > > [ 850.305385] page:ffffea001a5a0f00 count:0 mapcount:1 mapping:dead000000000400 index:0x1ffffffffff > [ 850.306773] flags: 0x2fffff80000000() > [ 850.307175] page dumped because: VM_BUG_ON_PAGE(1 && PageTail(page)) > [ 850.308027] page_owner info is not active (free page?) Could you check this completely untested patch: diff --git a/mm/mlock.c b/mm/mlock.c index af421d8bd6da..9197b6721a1e 100644 --- a/mm/mlock.c +++ b/mm/mlock.c @@ -393,6 +393,13 @@ static unsigned long __munlock_pagevec_fill(struct pagevec *pvec, if (!page || page_zone_id(page) != zoneid) break; + /* + * Do not use pagevec for PTE-mapped THP, + * munlock_vma_pages_range() will handle them. + */ + if (PageTransCompound(page)) + break; + get_page(page); /* * Increase the address that will be returned *before* the -- Kirill A. Shutemov -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org