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=-6.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,USER_AGENT_GIT 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 61B78C43441 for ; Sun, 11 Nov 2018 23:32:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 28BB42077B for ; Sun, 11 Nov 2018 23:32:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="JH4zjfI9" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 28BB42077B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388526AbeKLIUR (ORCPT ); Mon, 12 Nov 2018 03:20:17 -0500 Received: from mail.kernel.org ([198.145.29.99]:44268 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388413AbeKLIUO (ORCPT ); Mon, 12 Nov 2018 03:20:14 -0500 Received: from localhost (unknown [206.108.79.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 581DE216FD; Sun, 11 Nov 2018 22:30:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1541975417; bh=27JdIfrD6Xs0rDBUM7pOqIimtUTilsaOfDz2AHZE0lU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JH4zjfI9LBc7z4M34pSnOdBFxAeHlcSExO/TgHieuOf/BJcGCdWX8B2iZWSquq0R+ g12Mn7XhWinAVID0EJIs3GG0Gyk56nZsqjZ63+PaMNi/2VZAxct23m7bLGtGbYAKES wfrB5EoLuhPegdX2sxr1O+xKAfdVeDBGEL8wwr4U= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jack Wang , Xiao Ni , Shaohua Li , Sasha Levin Subject: [PATCH 4.18 139/350] md: fix memleak for mempool Date: Sun, 11 Nov 2018 14:20:03 -0800 Message-Id: <20181111221713.864954585@linuxfoundation.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181111221707.043394111@linuxfoundation.org> References: <20181111221707.043394111@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jack Wang [ Upstream commit 6aaa58c994277647f8b05ffef3b9b225a2d08f36 ] I noticed kmemleak report memory leak when run create/stop md in a loop, backtrace: [<000000001ca975e7>] mempool_create_node+0x86/0xd0 [<0000000095576bcd>] md_run+0x1057/0x1410 [md_mod] [<000000007b45c5fc>] do_md_run+0x15/0x130 [md_mod] [<000000001ede9ec0>] md_ioctl+0x1f49/0x25d0 [md_mod] [<000000004142cacf>] blkdev_ioctl+0x680/0xd00 The root cause is we alloc mddev->flush_pool and mddev->flush_bio_pool in md_run, but from do_md_stop will not call into md_stop but __md_stop, move the mempool_destroy to __md_stop fixes the problem for me. The bug was introduced in 5a409b4f56d5, the fixes should go to 4.18+ Fixes: 5a409b4f56d5 ("MD: fix lock contention for flush bios") Signed-off-by: Jack Wang Reviewed-by: Xiao Ni Signed-off-by: Shaohua Li Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/md/md.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -5909,14 +5909,6 @@ static void __md_stop(struct mddev *mdde mddev->to_remove = &md_redundancy_group; module_put(pers->owner); clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); -} - -void md_stop(struct mddev *mddev) -{ - /* stop the array and free an attached data structures. - * This is called from dm-raid - */ - __md_stop(mddev); if (mddev->flush_bio_pool) { mempool_destroy(mddev->flush_bio_pool); mddev->flush_bio_pool = NULL; @@ -5925,6 +5917,14 @@ void md_stop(struct mddev *mddev) mempool_destroy(mddev->flush_pool); mddev->flush_pool = NULL; } +} + +void md_stop(struct mddev *mddev) +{ + /* stop the array and free an attached data structures. + * This is called from dm-raid + */ + __md_stop(mddev); bioset_exit(&mddev->bio_set); bioset_exit(&mddev->sync_set); }