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 086CDC433FE for ; Thu, 2 Dec 2021 15:40:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Reply-To:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type: MIME-Version:References:Message-ID:In-Reply-To:Subject:cc:To:From:Date: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=sed5bGIMCTL3LpI6X189AK7dXYzeAgUY3H56SGTGkAg=; b=G679E6EGAOLQJQA5P/VrERkL0b bZYI7yrRK5rVZX5OQJv0/9NAb0ZvfSzPEpJuz+R83ifIcFeIkuC7pM8Amg7nvZiMgiIYcxf8xBOzi dpaowCT1V3jegqVYXSlprk1qRvQyB3m1ogM3Ch9th2D4TGAFeofKUhgPp6G90J6LRxHF9/klU19yB l/h1HtzDS88ZE6SYB0zdaakjXeJmGTzmjkIoBGUTozuOa7LskSxvmKIdVqM+O44uP2nykTvJlNF/S ghPRnQ0Q+O3uvGMzjRfeWUlYC/iWWkD3j9G+vJLt2XBIb2ag/7xmQc2Z7+1roCIeygVBLq8MHPfBY XqXsQi+g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1msoCY-00Co4U-Am; Thu, 02 Dec 2021 15:40:50 +0000 Received: from mailbackend.panix.com ([166.84.1.89]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mso9I-00CnAy-QC for linux-nvme@lists.infradead.org; Thu, 02 Dec 2021 15:37:30 +0000 Received: from xps-7390.lan (50-233-66-25-static.hfc.comcastbusiness.net [50.233.66.25]) by mailbackend.panix.com (Postfix) with ESMTPSA id 4J4g7W0QqVz2jCv; Thu, 2 Dec 2021 10:37:26 -0500 (EST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=panix.com; s=panix; t=1638459447; bh=dbKm0N0V3+vmx7loDcn20Anbh9JDyOpiRkOKnYCaoPo=; h=Date:From:Reply-To:To:cc:Subject:In-Reply-To:References; b=A7kKY5Je6s5F+dwDSFtlTMCWbUVWbq9JEsNVRFpg6ZFGq6fmQ1UUeLeXnMbRDBhsn BtdVL5OPgxJ0b3FT8zipfDsiS5pO5uhkVwXWUeevTkneiIemJaYBXpyzJ1kqRR0PI7 /e7O8ej/mv7oXZUrp+gru9VOcZ3QJYW+ge2XFneY= Date: Thu, 2 Dec 2021 07:37:26 -0800 (PST) From: "Kenneth R. Crudup" To: Jens Axboe cc: linux-bcache@vger.kernel.org, linux-block@vger.kernel.org, linux-ext4@vger.kernel.org, linux-nvme@lists.infradead.org, shinichiro.kawasaki@wdc.com Subject: Re: Write I/O queue hangup at random on recent Linus' kernels In-Reply-To: <4429eed8-b9b9-6943-f76-6ea38d695248@panix.com> Message-ID: References: <4429eed8-b9b9-6943-f76-6ea38d695248@panix.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211202_073728_958473_2DAAC2CA X-CRM114-Status: UNSURE ( 4.68 ) X-CRM114-Notice: Please train this message. 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: , Reply-To: "Kenneth R. Crudup" Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On Thu, 2 Dec 2021, Kenneth R. Crudup wrote: > $ egrep -r . $(sudo find /sys/block/*/ -name inflight ) > > ... but they were all zeros. ... and similarly: ---- $ sudo egrep -r . $(sudo find /sys/kernel/debug/block/ -name inflight) /sys/kernel/debug/block/mmcblk0/rqos/wbt/inflight:0: inflight 0 /sys/kernel/debug/block/mmcblk0/rqos/wbt/inflight:1: inflight 0 /sys/kernel/debug/block/mmcblk0/rqos/wbt/inflight:2: inflight 0 /sys/kernel/debug/block/sda/rqos/wbt/inflight:0: inflight 0 /sys/kernel/debug/block/sda/rqos/wbt/inflight:1: inflight 0 /sys/kernel/debug/block/sda/rqos/wbt/inflight:2: inflight 0 /sys/kernel/debug/block/nvme0n1/rqos/wbt/inflight:0: inflight 0 /sys/kernel/debug/block/nvme0n1/rqos/wbt/inflight:1: inflight 0 /sys/kernel/debug/block/nvme0n1/rqos/wbt/inflight:2: inflight 0 /sys/kernel/debug/block/loop7/rqos/wbt/inflight:0: inflight 0 /sys/kernel/debug/block/loop7/rqos/wbt/inflight:1: inflight 0 /sys/kernel/debug/block/loop7/rqos/wbt/inflight:2: inflight 0 /sys/kernel/debug/block/loop6/rqos/wbt/inflight:0: inflight 0 /sys/kernel/debug/block/loop6/rqos/wbt/inflight:1: inflight 0 /sys/kernel/debug/block/loop6/rqos/wbt/inflight:2: inflight 0 /sys/kernel/debug/block/loop5/rqos/wbt/inflight:0: inflight 0 /sys/kernel/debug/block/loop5/rqos/wbt/inflight:1: inflight 0 /sys/kernel/debug/block/loop5/rqos/wbt/inflight:2: inflight 0 /sys/kernel/debug/block/loop4/rqos/wbt/inflight:0: inflight 0 /sys/kernel/debug/block/loop4/rqos/wbt/inflight:1: inflight 0 /sys/kernel/debug/block/loop4/rqos/wbt/inflight:2: inflight 0 /sys/kernel/debug/block/loop3/rqos/wbt/inflight:0: inflight 0 /sys/kernel/debug/block/loop3/rqos/wbt/inflight:1: inflight 0 /sys/kernel/debug/block/loop3/rqos/wbt/inflight:2: inflight 0 /sys/kernel/debug/block/loop2/rqos/wbt/inflight:0: inflight 0 /sys/kernel/debug/block/loop2/rqos/wbt/inflight:1: inflight 0 /sys/kernel/debug/block/loop2/rqos/wbt/inflight:2: inflight 0 /sys/kernel/debug/block/loop1/rqos/wbt/inflight:0: inflight 0 /sys/kernel/debug/block/loop1/rqos/wbt/inflight:1: inflight 0 /sys/kernel/debug/block/loop1/rqos/wbt/inflight:2: inflight 0 /sys/kernel/debug/block/loop0/rqos/wbt/inflight:0: inflight 0 /sys/kernel/debug/block/loop0/rqos/wbt/inflight:1: inflight 0 /sys/kernel/debug/block/loop0/rqos/wbt/inflight:2: inflight 0 ---- (... but just now, I got a delayed popup from my UI, which then went back to being unresponsive again) -Kenny -- Kenneth R. Crudup / Sr. SW Engineer, Scott County Consulting, Orange County CA