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[66.187.233.206]) by smtp.gmail.com with ESMTPSA id v24sm4568489qkj.40.2019.03.22.06.43.02 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 22 Mar 2019 06:43:02 -0700 (PDT) Message-ID: <1553262181.26196.22.camel@lca.pw> Subject: Re: kernel BUG at include/linux/mm.h:1020! From: Qian Cai To: Mikhail Gavrilov Cc: Daniel Jordan , linux-mm@kvack.org, mgorman@techsingularity.net, vbabka@suse.cz Date: Fri, 22 Mar 2019 09:43:01 -0400 In-Reply-To: References: <20190315205826.fgbelqkyuuayevun@ca-dmjordan1.us.oracle.com> <1553174486.26196.11.camel@lca.pw> <1553183333.26196.15.camel@lca.pw> <1553195694.26196.20.camel@lca.pw> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.22.6 (3.22.6-10.el7) Mime-Version: 1.0 Content-Transfer-Encoding: 8bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000230, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, 2019-03-22 at 08:41 +0500, Mikhail Gavrilov wrote: > On Fri, 22 Mar 2019 at 00:14, Qian Cai wrote: > > > > > > That is OK. The above debug patch may still be useful to figure out where > > those > > pages come from (or you could add those 3 pages address to the patch as > > well). > > They may be initialized in a similar fashion or uninitialized to begin with. > > Strange I modified patch for catch all 0xffffXXXXX07ce000 pages > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index 03fcf73..8808e2a 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -1273,6 +1273,10 @@ static void free_one_page(struct zone *zone, >  static void __meminit __init_single_page(struct page *page, unsigned long > pfn, >   unsigned long zone, int nid) >  { > + if (0xffff00000fffffff & page == (void *)0xffff0000007ce000) { > + printk("KK page = %px\n", page); > + dump_stack(); > + } >   mm_zero_struct_page(page); >   set_page_links(page, zone, nid, pfn); >   init_page_count(page); Those pages are not initialized at all which likely mean that memblock did not even allocate them at the first place, so Mel's patch might work.