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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 9D112C433EF for ; Thu, 25 Nov 2021 21:07:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:MIME-Version:Date:Message-ID:From:References:Cc:To: Subject:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=ptUvXWnHFTEjd8NLf2/MtTjEjiATPRukf4apEyvnHzs=; b=FYZp7uxJmyOxhJESw1R30Wn1TJ 6zmKigzVb/H5N642yYF4sWKvgQ7R1Ru2LDlwHBuwzFH3BcVt5veK/8mhbQNn0hkHknTxY5cY8+9bn s7sQqjXllNMGn2p+BYkmr5WS9mAkPlkWYZJC30Kqn+3R9wBLD2TnN1+RhwtIzmmReXTI+N5IydiYH xubpcnlWe/7N7GhsiGucXUuV0BePwp0tYRgwEa9YR/ddHkov7eOLNVS5psMOQpKBsstvGo00y5Ldt qiPErDetmiQUTRGcumhEWDd/Ga9y+Zpnmd3NsY0HS4CbJtLG7rsYSFtUyseYqdYZZMVRie5l4xIRp s+FaihJg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mqLxv-008eF0-8A; Thu, 25 Nov 2021 21:07:35 +0000 Received: from mail-io1-xd30.google.com ([2607:f8b0:4864:20::d30]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mqLxs-008eEQ-DG for linux-nvme@lists.infradead.org; Thu, 25 Nov 2021 21:07:33 +0000 Received: by mail-io1-xd30.google.com with SMTP id x10so9000036ioj.9 for ; Thu, 25 Nov 2021 13:07:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20210112.gappssmtp.com; s=20210112; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=ptUvXWnHFTEjd8NLf2/MtTjEjiATPRukf4apEyvnHzs=; b=Ok1P9w2zeGVzIESIN4pPNTb2gePDrh7PkYcZc61pXluqLnkbyJtwbpgeFvFvsUDFaY 3RcmLQvTLVR75p+AnQUD+cZ2DErpBjnestkr5fCc2JHJNnfiGaihVrD9TeYhiApsqzOK /mOsM9N9SXmWgcLZuEFKuynZJHKkMOfkSW/5ryenYLoCn6I3424ObrgiSY9YzwbSFfRO kmmrGcTllfpSj5RhWT7YjPm5HDm4cToQPO20haFOfaYHC9XSn1rLb9hyO1es1fZO2ZzC VjZ+sIM0dRXq/RWRiqaBSfaFruCQLjV19xv+RRd0wshHosLmai6Bwbpf11nfPPekqXZz dx/Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=ptUvXWnHFTEjd8NLf2/MtTjEjiATPRukf4apEyvnHzs=; b=noq/GvBH9UM6zlbnX2k9eQL/8rNKzK/Jggax40DiVFeVThbo4l5garUDlaBy4uHtU/ Xkwlq6YHgRq2P24gExtlWmjrsHCnNtpYVV9TZhG5lnXj9QEwCFd+LZ92faDcsLGRfUPR j3BEGL5KOYOtts9Az/x2D53keIlQ2J5x8U+/zXRV3CHn+rfqscs5WQ6no40oRFu1fm41 Wc1Xp+VHJYftFCj4Hk2y6Su8eQyatPflm3dkJdYyQyw7rjjNzNoSCI9xDDcSzP8frgCu f7L1NE2iTXZ8SoBNNBxpkr1d8yTVv4JHpyXjphIASUR6oRk0+7NXVFQWtUAjgajQfe0e t3bQ== X-Gm-Message-State: AOAM530dC64PEw4extqU5Qrx6ZJRrsFPUFLNkNyjqcf4D2wvMtzDh0+G bMHW/XXDHzJ7C5gk5KIUtzfqHtGd4WC1cPmm X-Google-Smtp-Source: ABdhPJytq9NfIBEXIegOGelrfmrArxCP5Vbnt6AUGHXX+T5C6V1sUA6iD/NmIKlHSz8tfc+R5WgM8w== X-Received: by 2002:a5d:9ec2:: with SMTP id a2mr30507116ioe.44.1637874451048; Thu, 25 Nov 2021 13:07:31 -0800 (PST) Received: from [192.168.1.116] ([66.219.217.159]) by smtp.gmail.com with ESMTPSA id m5sm2088428iln.11.2021.11.25.13.07.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 25 Nov 2021 13:07:30 -0800 (PST) Subject: Re: Write I/O queue hangup at random on recent Linus' kernels To: "Kenneth R. Crudup" Cc: linux-bcache@vger.kernel.org, linux-block@vger.kernel.org, linux-ext4@vger.kernel.org, linux-nvme@lists.infradead.org References: From: Jens Axboe Message-ID: <17206ea6-506d-b1de-09e8-c935ff308bd6@kernel.dk> Date: Thu, 25 Nov 2021 14:07:29 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211125_130732_556252_DEE713AE X-CRM114-Status: GOOD ( 12.01 ) 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: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On 11/25/21 2:05 PM, Kenneth R. Crudup wrote: > > On Tue, 23 Nov 2021, Jens Axboe wrote: > >> It looks like some missed accounting. You can just disable wbt for now, would >> be a useful data point to see if that fixes it. Just do: > >> echo 0 > /sys/block/nvme0n1/queue/wbt_lat_usec > >> and that will disable writeback throttling on that device. > > It's been about 48 hours and haven't seen the issue since doing this. Great, thanks for verifying. From your report 5.16-rc2 has the issue, is 5.15 fine? -- Jens Axboe