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 BD26DC433FE for ; Thu, 25 Nov 2021 21:11:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231621AbhKYVOg (ORCPT ); Thu, 25 Nov 2021 16:14:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35100 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233424AbhKYVMf (ORCPT ); Thu, 25 Nov 2021 16:12:35 -0500 Received: from mail-io1-xd2a.google.com (mail-io1-xd2a.google.com [IPv6:2607:f8b0:4864:20::d2a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D49C0C06175C for ; Thu, 25 Nov 2021 13:07:31 -0800 (PST) Received: by mail-io1-xd2a.google.com with SMTP id e144so9006951iof.3 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=jggH+g7v+/x7izKXJMOeXIYO53+HdpDsN8Xx9Rgyt4AHV1ZSWaZ5k7P18gnRCK/Klc FMQ24UlYEKXPTQYj0GGgwWDX9yIKPGR/ZvkK4U1FxW2v3xYmN+XDmKXC5k2g+AmAA1eG rJ6hVQExSmToUFyLCf02fPhv2KhQBgzfhgEoVTJaP8rd3NDSxKaeg3n2PeTF5v8Og7Mf SI1ddxVaYenKoqVW1uBrdP+9oYeoyX0dyxeBTcOGMdDX3cTEX9ywxseliku3a927UepA cLL2aONOAKO7tYwxAT9JhuC07m9J96THT8cGzfsTCBdZYOQBBdUeYg8/hE02eVHymrtV 0nRw== X-Gm-Message-State: AOAM532XWgpu0B7fbFqvDPcmfSsQsQQfWdj8mavTySMFfkDy4s7aBoia nGobziNKV9IEusm5rSfqQsiAUA== 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 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.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