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=-5.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 D4DB2C07E96 for ; Tue, 6 Jul 2021 08:46:00 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 961116121F for ; Tue, 6 Jul 2021 08:46:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 961116121F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com 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=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc: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=CJCB2id4WtAXgXm/Tid2GoRvwTFVogzKc9lsXFo3sqY=; b=EuJdlsIBVAsF5E BcX2xZB5LMeX2jXHvBw6el2laxHnzIVQthj84YEPedFoLgHTRvyIEnTYVODsKe2r6hszklK1+CKxY XJscaQpgdLBIBAL1OLaX6SGdbDe6C9ASC7YzgC1VD2grQ2A6nEJqREcwoJry0cM78L8vjNTf8eZnA PK2u+EYMcsNygDtamRyo1GqpKmO3QotdkDruMLQu2XuuaMd7J9pl2+ioNH8L+z2q/26wmT99roxu6 U3Y/ue6W2xPHeB7tyvpZKn7UcVkXW7VYaPCn5jdbzAyOR8Du1k8W3xxhzfivFNNga0EwVmAiuHV0F ZnrDfW5aeF5ux16WA+Hw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1m0giE-00Apid-R5; Tue, 06 Jul 2021 08:45:50 +0000 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1m0giB-00ApiE-Gt for linux-nvme@lists.infradead.org; Tue, 06 Jul 2021 08:45:49 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1625561145; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=TmP/CP+r95G7grSdPIW18dia2dKSqY5syV3kf7Ux4EM=; b=GdSW6oqNEcupBQEiXETQCqhfTDzKZnkfTVyfMv4WAbmA7JUxu6A95OEcN1LEoboPa49IlM Uy0KnoN01TsCOodNR0hxc3cPK+lg475Zx9DXBQVt207D3Q8Z3xjxUtNuCIUfncRoHUudpd +EPDGI7QLZ/i2wL8R22d/VJlV019LvA= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-253-_MVr4dIrOki0r5CkufaFbA-1; Tue, 06 Jul 2021 04:45:44 -0400 X-MC-Unique: _MVr4dIrOki0r5CkufaFbA-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id BD0AC9126B; Tue, 6 Jul 2021 08:45:42 +0000 (UTC) Received: from T590 (ovpn-12-27.pek2.redhat.com [10.72.12.27]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 84E6B2EB17; Tue, 6 Jul 2021 08:45:35 +0000 (UTC) Date: Tue, 6 Jul 2021 16:45:30 +0800 From: Ming Lei To: Daniel Wagner Cc: linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, James Smart , Keith Busch , Jens Axboe , Sagi Grimberg Subject: Re: [PATCH 2/2] nvme-fc: Wait with a timeout for queue to freeze Message-ID: References: <20210625101649.49296-1-dwagner@suse.de> <20210625101649.49296-3-dwagner@suse.de> <20210705162519.qqlklisxcsiopflw@beryllium.lan> <20210706081010.dqmg7bxik5gnym5k@beryllium.lan> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210706081010.dqmg7bxik5gnym5k@beryllium.lan> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210706_014547_696120_6DBE6CE6 X-CRM114-Status: GOOD ( 17.06 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 Tue, Jul 06, 2021 at 10:10:10AM +0200, Daniel Wagner wrote: > On Tue, Jul 06, 2021 at 03:29:11PM +0800, Ming Lei wrote: > > > and this seems to confirm, no I/O in flight. > > > > What is the output of the following command after the hang is triggered? > > > > (cd /sys/kernel/debug/block/nvme0n1 && find . -type f -exec grep -aH . {} \;) > > > > Suppose the hang disk is nvme0n1. > > see attachement > > > No, percpu_ref_is_zero() is fine to be called in atomic mode. > > Okay, that is what I hoped for :) > /sys/kernel/debug/block/nvme0c0n1# find . -type f -exec grep -aH . {} \; It is the mpath device's debugfs, what is output for the nvmef's debugfs? Thanks, Ming _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme