From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Subject: Re: [PATCH 18/20] block: refator submit_bio_noacct Date: Thu, 2 Jul 2020 17:14:53 +0200 Message-ID: <20200702151453.GA1799@lst.de> References: <20200629193947.2705954-1-hch@lst.de> <20200629193947.2705954-19-hch@lst.de> <20200702141001.GA3834@lca.pw> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <20200702141001.GA3834-J5quhbR+WMc@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: drbd-dev-bounces-cunTk1MwBs8qoQakbn7OcQ@public.gmane.org Errors-To: drbd-dev-bounces-cunTk1MwBs8qoQakbn7OcQ@public.gmane.org To: Qian Cai Cc: Jens Axboe , linux-xtensa-PjhNF2WwrV/0Sa2dR60CXw@public.gmane.org, linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org, linux-s390-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-m68k-cunTk1MwBs8S/qaLPR03pWD2FQJk+8+b@public.gmane.org, linux-nvme-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-raid-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, dm-devel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, Alexander Potapenko , kasan-dev-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org, Andrey Ryabinin , linux-bcache-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, Christoph Hellwig , Dmitry Vyukov , drbd-dev-cunTk1MwBs8qoQakbn7OcQ@public.gmane.org List-Id: dm-devel.ids On Thu, Jul 02, 2020 at 10:10:10AM -0400, Qian Cai wrote: > On Mon, Jun 29, 2020 at 09:39:45PM +0200, Christoph Hellwig wrote: > > Split out a __submit_bio_noacct helper for the actual de-recursion > > algorithm, and simplify the loop by using a continue when we can't > > enter the queue for a bio. > > > > Signed-off-by: Christoph Hellwig > > Reverting this commit and its dependencies, > > 5a6c35f9af41 block: remove direct_make_request > ff93ea0ce763 block: shortcut __submit_bio_noacct for blk-mq drivers > > fixed the stack-out-of-bounds during boot, > > https://lore.kernel.org/linux-block/000000000000bcdeaa05a97280e4-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org/ Yikes. bio_alloc_bioset pokes into bio_list[1] in a totally undocumented way. But even with that the problem should only show up with "block: shortcut __submit_bio_noacct for blk-mq drivers". Can you try this patch? diff --git a/block/blk-core.c b/block/blk-core.c index bf882b8d84450c..9f1bf8658b611a 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1155,11 +1155,10 @@ static blk_qc_t __submit_bio_noacct(struct bio *bio) static blk_qc_t __submit_bio_noacct_mq(struct bio *bio) { struct gendisk *disk = bio->bi_disk; - struct bio_list bio_list; + struct bio_list bio_list[2] = { }; blk_qc_t ret = BLK_QC_T_NONE; - bio_list_init(&bio_list); - current->bio_list = &bio_list; + current->bio_list = bio_list; do { WARN_ON_ONCE(bio->bi_disk != disk); @@ -1174,7 +1173,7 @@ static blk_qc_t __submit_bio_noacct_mq(struct bio *bio) } ret = blk_mq_submit_bio(bio); - } while ((bio = bio_list_pop(&bio_list))); + } while ((bio = bio_list_pop(&bio_list[0]))); current->bio_list = NULL; return ret; From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4817AC433E0 for ; Thu, 2 Jul 2020 15:15:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 25391206B7 for ; Thu, 2 Jul 2020 15:15:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730076AbgGBPO7 (ORCPT ); Thu, 2 Jul 2020 11:14:59 -0400 Received: from verein.lst.de ([213.95.11.211]:44496 "EHLO verein.lst.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729551AbgGBPO7 (ORCPT ); Thu, 2 Jul 2020 11:14:59 -0400 Received: by verein.lst.de (Postfix, from userid 2407) id 9DA8768B05; Thu, 2 Jul 2020 17:14:53 +0200 (CEST) Date: Thu, 2 Jul 2020 17:14:53 +0200 From: Christoph Hellwig To: Qian Cai Cc: Christoph Hellwig , Jens Axboe , dm-devel@redhat.com, linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-xtensa@linux-xtensa.org, drbd-dev@lists.linbit.com, linuxppc-dev@lists.ozlabs.org, linux-bcache@vger.kernel.org, linux-raid@vger.kernel.org, linux-nvdimm@lists.01.org, linux-nvme@lists.infradead.org, linux-s390@vger.kernel.org, Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , kasan-dev@googlegroups.com Subject: Re: [PATCH 18/20] block: refator submit_bio_noacct Message-ID: <20200702151453.GA1799@lst.de> References: <20200629193947.2705954-1-hch@lst.de> <20200629193947.2705954-19-hch@lst.de> <20200702141001.GA3834@lca.pw> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200702141001.GA3834@lca.pw> User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-bcache-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-bcache@vger.kernel.org Message-ID: <20200702151453.JZK4plOp0-bHPa7RUhC1ix3IqHu63_W3a440H209C3M@z> On Thu, Jul 02, 2020 at 10:10:10AM -0400, Qian Cai wrote: > On Mon, Jun 29, 2020 at 09:39:45PM +0200, Christoph Hellwig wrote: > > Split out a __submit_bio_noacct helper for the actual de-recursion > > algorithm, and simplify the loop by using a continue when we can't > > enter the queue for a bio. > > > > Signed-off-by: Christoph Hellwig > > Reverting this commit and its dependencies, > > 5a6c35f9af41 block: remove direct_make_request > ff93ea0ce763 block: shortcut __submit_bio_noacct for blk-mq drivers > > fixed the stack-out-of-bounds during boot, > > https://lore.kernel.org/linux-block/000000000000bcdeaa05a97280e4@google.com/ Yikes. bio_alloc_bioset pokes into bio_list[1] in a totally undocumented way. But even with that the problem should only show up with "block: shortcut __submit_bio_noacct for blk-mq drivers". Can you try this patch? diff --git a/block/blk-core.c b/block/blk-core.c index bf882b8d84450c..9f1bf8658b611a 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1155,11 +1155,10 @@ static blk_qc_t __submit_bio_noacct(struct bio *bio) static blk_qc_t __submit_bio_noacct_mq(struct bio *bio) { struct gendisk *disk = bio->bi_disk; - struct bio_list bio_list; + struct bio_list bio_list[2] = { }; blk_qc_t ret = BLK_QC_T_NONE; - bio_list_init(&bio_list); - current->bio_list = &bio_list; + current->bio_list = bio_list; do { WARN_ON_ONCE(bio->bi_disk != disk); @@ -1174,7 +1173,7 @@ static blk_qc_t __submit_bio_noacct_mq(struct bio *bio) } ret = blk_mq_submit_bio(bio); - } while ((bio = bio_list_pop(&bio_list))); + } while ((bio = bio_list_pop(&bio_list[0]))); current->bio_list = NULL; return ret; From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 180DBC433DF for ; Thu, 2 Jul 2020 15:15:01 +0000 (UTC) Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E9B10206B7 for ; Thu, 2 Jul 2020 15:15:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E9B10206B7 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nvdimm-bounces@lists.01.org Received: from ml01.vlan13.01.org (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id D078711470AAD; Thu, 2 Jul 2020 08:15:00 -0700 (PDT) Received-SPF: None (mailfrom) identity=mailfrom; client-ip=213.95.11.211; helo=verein.lst.de; envelope-from=hch@lst.de; receiver= Received: from verein.lst.de (verein.lst.de [213.95.11.211]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 3D4021141F7AD for ; Thu, 2 Jul 2020 08:14:57 -0700 (PDT) Received: by verein.lst.de (Postfix, from userid 2407) id 9DA8768B05; Thu, 2 Jul 2020 17:14:53 +0200 (CEST) Date: Thu, 2 Jul 2020 17:14:53 +0200 From: Christoph Hellwig To: Qian Cai Subject: Re: [PATCH 18/20] block: refator submit_bio_noacct Message-ID: <20200702151453.GA1799@lst.de> References: <20200629193947.2705954-1-hch@lst.de> <20200629193947.2705954-19-hch@lst.de> <20200702141001.GA3834@lca.pw> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200702141001.GA3834@lca.pw> User-Agent: Mutt/1.5.17 (2007-11-01) Message-ID-Hash: QN7EAYKZOOEYQEX6LZDXQA2FKNZ3UJHK X-Message-ID-Hash: QN7EAYKZOOEYQEX6LZDXQA2FKNZ3UJHK X-MailFrom: hch@lst.de X-Mailman-Rule-Hits: nonmember-moderation X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation CC: Christoph Hellwig , Jens Axboe , dm-devel@redhat.com, linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-xtensa@linux-xtensa.org, drbd-dev@lists.linbit.com, linuxppc-dev@lists.ozlabs.org, linux-bcache@vger.kernel.org, linux-raid@vger.kernel.org, linux-nvdimm@lists.01.org, linux-nvme@lists.infradead.org, linux-s390@vger.kernel.org, Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , kasan-dev@googlegroups.com X-Mailman-Version: 3.1.1 Precedence: list List-Id: "Linux-nvdimm developer list." Archived-At: List-Archive: List-Help: List-Post: List-Subscribe: List-Unsubscribe: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit On Thu, Jul 02, 2020 at 10:10:10AM -0400, Qian Cai wrote: > On Mon, Jun 29, 2020 at 09:39:45PM +0200, Christoph Hellwig wrote: > > Split out a __submit_bio_noacct helper for the actual de-recursion > > algorithm, and simplify the loop by using a continue when we can't > > enter the queue for a bio. > > > > Signed-off-by: Christoph Hellwig > > Reverting this commit and its dependencies, > > 5a6c35f9af41 block: remove direct_make_request > ff93ea0ce763 block: shortcut __submit_bio_noacct for blk-mq drivers > > fixed the stack-out-of-bounds during boot, > > https://lore.kernel.org/linux-block/000000000000bcdeaa05a97280e4@google.com/ Yikes. bio_alloc_bioset pokes into bio_list[1] in a totally undocumented way. But even with that the problem should only show up with "block: shortcut __submit_bio_noacct for blk-mq drivers". Can you try this patch? diff --git a/block/blk-core.c b/block/blk-core.c index bf882b8d84450c..9f1bf8658b611a 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1155,11 +1155,10 @@ static blk_qc_t __submit_bio_noacct(struct bio *bio) static blk_qc_t __submit_bio_noacct_mq(struct bio *bio) { struct gendisk *disk = bio->bi_disk; - struct bio_list bio_list; + struct bio_list bio_list[2] = { }; blk_qc_t ret = BLK_QC_T_NONE; - bio_list_init(&bio_list); - current->bio_list = &bio_list; + current->bio_list = bio_list; do { WARN_ON_ONCE(bio->bi_disk != disk); @@ -1174,7 +1173,7 @@ static blk_qc_t __submit_bio_noacct_mq(struct bio *bio) } ret = blk_mq_submit_bio(bio); - } while ((bio = bio_list_pop(&bio_list))); + } while ((bio = bio_list_pop(&bio_list[0]))); current->bio_list = NULL; return ret; _______________________________________________ Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org To unsubscribe send an email to linux-nvdimm-leave@lists.01.org From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7289EC433E0 for ; Thu, 2 Jul 2020 15:15:07 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 406F6206B7 for ; Thu, 2 Jul 2020 15:15:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="HbOKzFNV" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 406F6206B7 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=784xVQVv2AeTW91bvg9a77diD0j+5KGvECCg7+kDvpk=; b=HbOKzFNV4oKR39ySwiiOnM/as kAJi7EpfoBS0d3ovl1VbghBlnhsYyYjyFDf8Os5BL6aNcKY4bPm7uZoxTTpI9/ZC2i1lyMqOnjfgk 7tt6+rsEcyA/Fip2eC8AbFmwlindup5Q+Ze9e+aibv+kJYk1egPTdCercEhbLsQ63gklRqsicdo/W +CFNUnNKDWDJOGoVsixi18OjeafOpsuImrhhz2Q50f39egDGRweiLM39/4IaCW/LiYMTFoj+VUyuV oltTWbpmfgBUPz2Xe6k2iEKwm9etG9KdfXGkLmuvZAytYL1//jamPBu2cLZrs0mhB5ZJ88xvsL5Km qcQ+Ezcdw==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jr0vT-0003Mm-V2; Thu, 02 Jul 2020 15:14:59 +0000 Received: from verein.lst.de ([213.95.11.211]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jr0vR-0003MK-Ri for linux-nvme@lists.infradead.org; Thu, 02 Jul 2020 15:14:58 +0000 Received: by verein.lst.de (Postfix, from userid 2407) id 9DA8768B05; Thu, 2 Jul 2020 17:14:53 +0200 (CEST) Date: Thu, 2 Jul 2020 17:14:53 +0200 From: Christoph Hellwig To: Qian Cai Subject: Re: [PATCH 18/20] block: refator submit_bio_noacct Message-ID: <20200702151453.GA1799@lst.de> References: <20200629193947.2705954-1-hch@lst.de> <20200629193947.2705954-19-hch@lst.de> <20200702141001.GA3834@lca.pw> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200702141001.GA3834@lca.pw> User-Agent: Mutt/1.5.17 (2007-11-01) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200702_111458_037883_9231D2A7 X-CRM114-Status: GOOD ( 13.09 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jens Axboe , linux-xtensa@linux-xtensa.org, linux-nvdimm@lists.01.org, linux-s390@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, dm-devel@redhat.com, Alexander Potapenko , kasan-dev@googlegroups.com, Andrey Ryabinin , linux-bcache@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Christoph Hellwig , Dmitry Vyukov , drbd-dev@lists.linbit.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On Thu, Jul 02, 2020 at 10:10:10AM -0400, Qian Cai wrote: > On Mon, Jun 29, 2020 at 09:39:45PM +0200, Christoph Hellwig wrote: > > Split out a __submit_bio_noacct helper for the actual de-recursion > > algorithm, and simplify the loop by using a continue when we can't > > enter the queue for a bio. > > > > Signed-off-by: Christoph Hellwig > > Reverting this commit and its dependencies, > > 5a6c35f9af41 block: remove direct_make_request > ff93ea0ce763 block: shortcut __submit_bio_noacct for blk-mq drivers > > fixed the stack-out-of-bounds during boot, > > https://lore.kernel.org/linux-block/000000000000bcdeaa05a97280e4@google.com/ Yikes. bio_alloc_bioset pokes into bio_list[1] in a totally undocumented way. But even with that the problem should only show up with "block: shortcut __submit_bio_noacct for blk-mq drivers". Can you try this patch? diff --git a/block/blk-core.c b/block/blk-core.c index bf882b8d84450c..9f1bf8658b611a 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1155,11 +1155,10 @@ static blk_qc_t __submit_bio_noacct(struct bio *bio) static blk_qc_t __submit_bio_noacct_mq(struct bio *bio) { struct gendisk *disk = bio->bi_disk; - struct bio_list bio_list; + struct bio_list bio_list[2] = { }; blk_qc_t ret = BLK_QC_T_NONE; - bio_list_init(&bio_list); - current->bio_list = &bio_list; + current->bio_list = bio_list; do { WARN_ON_ONCE(bio->bi_disk != disk); @@ -1174,7 +1173,7 @@ static blk_qc_t __submit_bio_noacct_mq(struct bio *bio) } ret = blk_mq_submit_bio(bio); - } while ((bio = bio_list_pop(&bio_list))); + } while ((bio = bio_list_pop(&bio_list[0]))); current->bio_list = NULL; return ret; _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A70BAC433DF for ; Thu, 2 Jul 2020 15:19:19 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5B58620771 for ; Thu, 2 Jul 2020 15:19:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5B58620771 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 49yMFc2slZzDqr6 for ; Fri, 3 Jul 2020 01:19:16 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=none (no SPF record) smtp.mailfrom=lst.de (client-ip=213.95.11.211; helo=verein.lst.de; envelope-from=hch@lst.de; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=lst.de Received: from verein.lst.de (verein.lst.de [213.95.11.211]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 49yM8k38hbzDqSg for ; Fri, 3 Jul 2020 01:15:00 +1000 (AEST) Received: by verein.lst.de (Postfix, from userid 2407) id 9DA8768B05; Thu, 2 Jul 2020 17:14:53 +0200 (CEST) Date: Thu, 2 Jul 2020 17:14:53 +0200 From: Christoph Hellwig To: Qian Cai Subject: Re: [PATCH 18/20] block: refator submit_bio_noacct Message-ID: <20200702151453.GA1799@lst.de> References: <20200629193947.2705954-1-hch@lst.de> <20200629193947.2705954-19-hch@lst.de> <20200702141001.GA3834@lca.pw> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200702141001.GA3834@lca.pw> User-Agent: Mutt/1.5.17 (2007-11-01) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jens Axboe , linux-xtensa@linux-xtensa.org, linux-nvdimm@lists.01.org, linux-s390@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, dm-devel@redhat.com, Alexander Potapenko , kasan-dev@googlegroups.com, Andrey Ryabinin , linux-bcache@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Christoph Hellwig , Dmitry Vyukov , drbd-dev@lists.linbit.com Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Thu, Jul 02, 2020 at 10:10:10AM -0400, Qian Cai wrote: > On Mon, Jun 29, 2020 at 09:39:45PM +0200, Christoph Hellwig wrote: > > Split out a __submit_bio_noacct helper for the actual de-recursion > > algorithm, and simplify the loop by using a continue when we can't > > enter the queue for a bio. > > > > Signed-off-by: Christoph Hellwig > > Reverting this commit and its dependencies, > > 5a6c35f9af41 block: remove direct_make_request > ff93ea0ce763 block: shortcut __submit_bio_noacct for blk-mq drivers > > fixed the stack-out-of-bounds during boot, > > https://lore.kernel.org/linux-block/000000000000bcdeaa05a97280e4@google.com/ Yikes. bio_alloc_bioset pokes into bio_list[1] in a totally undocumented way. But even with that the problem should only show up with "block: shortcut __submit_bio_noacct for blk-mq drivers". Can you try this patch? diff --git a/block/blk-core.c b/block/blk-core.c index bf882b8d84450c..9f1bf8658b611a 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1155,11 +1155,10 @@ static blk_qc_t __submit_bio_noacct(struct bio *bio) static blk_qc_t __submit_bio_noacct_mq(struct bio *bio) { struct gendisk *disk = bio->bi_disk; - struct bio_list bio_list; + struct bio_list bio_list[2] = { }; blk_qc_t ret = BLK_QC_T_NONE; - bio_list_init(&bio_list); - current->bio_list = &bio_list; + current->bio_list = bio_list; do { WARN_ON_ONCE(bio->bi_disk != disk); @@ -1174,7 +1173,7 @@ static blk_qc_t __submit_bio_noacct_mq(struct bio *bio) } ret = blk_mq_submit_bio(bio); - } while ((bio = bio_list_pop(&bio_list))); + } while ((bio = bio_list_pop(&bio_list[0]))); current->bio_list = NULL; return ret; From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by mail19.linbit.com (LINBIT Mail Daemon) with ESMTP id BE35A420385 for ; Thu, 2 Jul 2020 17:14:56 +0200 (CEST) Date: Thu, 2 Jul 2020 17:14:53 +0200 From: Christoph Hellwig To: Qian Cai Message-ID: <20200702151453.GA1799@lst.de> References: <20200629193947.2705954-1-hch@lst.de> <20200629193947.2705954-19-hch@lst.de> <20200702141001.GA3834@lca.pw> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200702141001.GA3834@lca.pw> Cc: Jens Axboe , linux-xtensa@linux-xtensa.org, linux-nvdimm@lists.01.org, linux-s390@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, dm-devel@redhat.com, Alexander Potapenko , kasan-dev@googlegroups.com, Andrey Ryabinin , linux-bcache@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Christoph Hellwig , Dmitry Vyukov , drbd-dev@lists.linbit.com Subject: Re: [Drbd-dev] [PATCH 18/20] block: refator submit_bio_noacct List-Id: "*Coordination* of development, patches, contributions -- *Questions* \(even to developers\) go to drbd-user, please." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Thu, Jul 02, 2020 at 10:10:10AM -0400, Qian Cai wrote: > On Mon, Jun 29, 2020 at 09:39:45PM +0200, Christoph Hellwig wrote: > > Split out a __submit_bio_noacct helper for the actual de-recursion > > algorithm, and simplify the loop by using a continue when we can't > > enter the queue for a bio. > > > > Signed-off-by: Christoph Hellwig > > Reverting this commit and its dependencies, > > 5a6c35f9af41 block: remove direct_make_request > ff93ea0ce763 block: shortcut __submit_bio_noacct for blk-mq drivers > > fixed the stack-out-of-bounds during boot, > > https://lore.kernel.org/linux-block/000000000000bcdeaa05a97280e4@google.com/ Yikes. bio_alloc_bioset pokes into bio_list[1] in a totally undocumented way. But even with that the problem should only show up with "block: shortcut __submit_bio_noacct for blk-mq drivers". Can you try this patch? diff --git a/block/blk-core.c b/block/blk-core.c index bf882b8d84450c..9f1bf8658b611a 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1155,11 +1155,10 @@ static blk_qc_t __submit_bio_noacct(struct bio *bio) static blk_qc_t __submit_bio_noacct_mq(struct bio *bio) { struct gendisk *disk = bio->bi_disk; - struct bio_list bio_list; + struct bio_list bio_list[2] = { }; blk_qc_t ret = BLK_QC_T_NONE; - bio_list_init(&bio_list); - current->bio_list = &bio_list; + current->bio_list = bio_list; do { WARN_ON_ONCE(bio->bi_disk != disk); @@ -1174,7 +1173,7 @@ static blk_qc_t __submit_bio_noacct_mq(struct bio *bio) } ret = blk_mq_submit_bio(bio); - } while ((bio = bio_list_pop(&bio_list))); + } while ((bio = bio_list_pop(&bio_list[0]))); current->bio_list = NULL; return ret;