From patchwork Fri Aug 20 00:02:34 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luis Chamberlain X-Patchwork-Id: 12448139 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=-17.0 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,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 C3290C432BE for ; Fri, 20 Aug 2021 00:02:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9F49560E78 for ; Fri, 20 Aug 2021 00:02:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237022AbhHTADM (ORCPT ); Thu, 19 Aug 2021 20:03:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35252 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236920AbhHTADM (ORCPT ); Thu, 19 Aug 2021 20:03:12 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5C96AC061757; Thu, 19 Aug 2021 17:02:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=eiAdZBFJ/dkIb72t8AnNUyPp8Tvk3ThI3ydnoCcM7/U=; b=AIjuVC5UgWFWnFXqx7Bn2i+zUQ 5e/ydjNH0PEFuNjC93ph7fDH9LRhqQKEmRUFaxPli3UoY70ktRL9USHskNG3rT2eMR7IyyP/kefCZ 9wRttJBSPNun7sISavUkuJSwSjJr5NPEAJAySDpGJrnBzuMDAHdoS54SbpxOKTmyaJCi11zn89lrf 59mJmGKMFJD9kJ0wIKwZ+UxrQhs8/PBvM6okpSoc+G5WiEIyC/XcM1UXbTZKJpvASijmowswwWHif F2RCIR+9gkx2G41bFabHIihCmVGA2conPJ1+PcwC6q/+5c++m9zm0zl8uA2RQKvt4o3liVP65d6Ht AdOaEawA==; Received: from mcgrof by bombadil.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1mGrzX-009mxy-0Y; Fri, 20 Aug 2021 00:02:35 +0000 From: Luis Chamberlain To: fstests@vger.kernel.org Cc: hare@suse.de, dgilbert@interlog.com, jeyu@kernel.org, lucas.demarchi@intel.com, linux-kernel@vger.kernel.org, Luis Chamberlain Subject: [PATCH v4 2/2] common/scsi_debug: use the patient module remover Date: Thu, 19 Aug 2021 17:02:34 -0700 Message-Id: <20210820000234.2333125-3-mcgrof@kernel.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210820000234.2333125-1-mcgrof@kernel.org> References: <20210820000234.2333125-1-mcgrof@kernel.org> MIME-Version: 1.0 Sender: Luis Chamberlain Precedence: bulk List-ID: X-Mailing-List: fstests@vger.kernel.org If you try to run tests such as generic/108 in a loop you'll eventually see a failure, but the failure can be a false positive and the test was just unable to remove the scsi_debug module. We need to give some time for the refcnt to become 0. For instance for the test generic/108 the refcnt lingers between 2 and 1. It should be 0 when we're done but a bit of time seems to be required. The chance of us trying to run rmmod when the refcnt is 2 or 1 is low, about 1/30 times if you run the test in a loop on linux-next today. Likewise, even when its 0 we just need a tiny breather before we can remove the module (sleep 10 suffices) but this is only required on older kernels. Otherwise removing the module will just fail. Some of these races are documented on the korg#212337, and Doug Gilbert has posted at least one patch attempt to try to help with this [1]. The patch does not resolve all the issues though, it helps though. [0] https://bugzilla.kernel.org/show_bug.cgi?id=212337 [1] https://lkml.kernel.org/r/20210508230745.27923-1-dgilbert@interlog.com Signed-off-by: Luis Chamberlain --- common/scsi_debug | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/common/scsi_debug b/common/scsi_debug index e7988469..3c9cd820 100644 --- a/common/scsi_debug +++ b/common/scsi_debug @@ -4,11 +4,13 @@ # # Functions useful for tests on unique block devices +. common/module + _require_scsi_debug() { # make sure we have the module and it's not already used modinfo scsi_debug 2>&1 > /dev/null || _notrun "scsi_debug module not found" - lsmod | grep -wq scsi_debug && (rmmod scsi_debug || _notrun "scsi_debug module in use") + lsmod | grep -wq scsi_debug && (_patient_rmmod scsi_debug || _notrun "scsi_debug module in use") # make sure it has the features we need # logical/physical sectors plus unmap support all went in together modinfo scsi_debug | grep -wq sector_size || _notrun "scsi_debug too old" @@ -53,5 +55,5 @@ _put_scsi_debug_dev() $UDEV_SETTLE_PROG n=$((n-1)) done - rmmod scsi_debug || _fail "Could not remove scsi_debug module" + _patient_rmmod scsi_debug || _fail "Could not remove scsi_debug module" }