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[66.187.233.206]) by smtp.gmail.com with ESMTPSA id h24sm3946602qte.50.2019.03.21.08.48.54 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 21 Mar 2019 08:48:55 -0700 (PDT) Message-ID: <1553183333.26196.15.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: Thu, 21 Mar 2019 11:48:53 -0400 In-Reply-To: References: <20190315205826.fgbelqkyuuayevun@ca-dmjordan1.us.oracle.com> <1553174486.26196.11.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=0.000182, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, 2019-03-21 at 20:08 +0500, Mikhail Gavrilov wrote: > On Thu, 21 Mar 2019 at 18:21, Qian Cai wrote: > > > > Does it come up with this page address every time? > > > > page:ffffcf49607ce000 > > No it doesn't. > > $ journalctl | grep "page:" > Mar 18 05:27:58 localhost.localdomain kernel: page:ffffdcd2607ce000 is > uninitialized and poisoned > Mar 20 22:29:19 localhost.localdomain kernel: page:ffffe4b7607ce000 is > uninitialized and poisoned > Mar 20 23:03:52 localhost.localdomain kernel: page:ffffd27aa07ce000 is > uninitialized and poisoned > Mar 21 09:29:29 localhost.localdomain kernel: page:ffffcf49607ce000 is > uninitialized and poisoned OK, those pages look similar enough. If you add this to __init_single_page() in mm/page_alloc.c : if (page == (void *)0xffffdcd2607ce000 || page == (void *)0xffffe4b7607ce000 || page == (void *)0xffffd27aa07ce000 || page == (void *)0xffffcf49607ce000) { printk("KK page = %px\n", page); dump_stack(); } to see where those pages have been initialized in the first place.