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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BD4DAC43219 for ; Wed, 6 Apr 2022 01:10:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1840438AbiDFBKP (ORCPT ); Tue, 5 Apr 2022 21:10:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53664 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1358069AbiDEK15 (ORCPT ); Tue, 5 Apr 2022 06:27:57 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6C0E93DDE8; Tue, 5 Apr 2022 03:14:23 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 0BA5F617A4; Tue, 5 Apr 2022 10:14:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1CBCDC385A0; Tue, 5 Apr 2022 10:14:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1649153662; bh=HdkMtmrEqzTR3W+FQELvxyIHklp9P8FC/+1eaSOJKRw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bk1f9s0aBxfuJN1r1PZHALgdTtmGnv8QnXTt23H/fOBG/dANTym75sBv7FgsgXubj gBoZgDnHp69XUCuYG1H5W0bY58y5rL8aJagn3DkUwRwRPpOIZAB6RI6L+OJZfsrPaf nWci4WH6AAlvsTim+XPW/Pa0sS+DM9p+gXJ4EPH8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tong Zhang , Ira Weiny , Christoph Hellwig , Dan Williams , Sasha Levin Subject: [PATCH 5.10 302/599] dax: make sure inodes are flushed before destroy cache Date: Tue, 5 Apr 2022 09:29:56 +0200 Message-Id: <20220405070307.820959484@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220405070258.802373272@linuxfoundation.org> References: <20220405070258.802373272@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tong Zhang [ Upstream commit a7e8de822e0b1979f08767c751f6c8a9c1d4ad86 ] A bug can be triggered by following command $ modprobe nd_pmem && modprobe -r nd_pmem [ 10.060014] BUG dax_cache (Not tainted): Objects remaining in dax_cache on __kmem_cache_shutdown() [ 10.060938] Slab 0x0000000085b729ac objects=9 used=1 fp=0x000000004f5ae469 flags=0x200000000010200(slab|head|node) [ 10.062433] Call Trace: [ 10.062673] dump_stack_lvl+0x34/0x44 [ 10.062865] slab_err+0x90/0xd0 [ 10.063619] __kmem_cache_shutdown+0x13b/0x2f0 [ 10.063848] kmem_cache_destroy+0x4a/0x110 [ 10.064058] __x64_sys_delete_module+0x265/0x300 This is caused by dax_fs_exit() not flushing inodes before destroy cache. To fix this issue, call rcu_barrier() before destroy cache. Signed-off-by: Tong Zhang Reviewed-by: Ira Weiny Reviewed-by: Christoph Hellwig Link: https://lore.kernel.org/r/20220212071111.148575-1-ztong0001@gmail.com Fixes: 7b6be8444e0f ("dax: refactor dax-fs into a generic provider of 'struct dax_device' instances") Signed-off-by: Dan Williams Signed-off-by: Sasha Levin --- drivers/dax/super.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/dax/super.c b/drivers/dax/super.c index cadbd0a1a1ef..260a247c60d2 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -723,6 +723,7 @@ static int dax_fs_init(void) static void dax_fs_exit(void) { kern_unmount(dax_mnt); + rcu_barrier(); kmem_cache_destroy(dax_cache); } -- 2.34.1