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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=unavailable 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 9D0FCC282DA for ; Tue, 9 Apr 2019 13:51:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 76FB42084C for ; Tue, 9 Apr 2019 13:51:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726112AbfDINvz (ORCPT ); Tue, 9 Apr 2019 09:51:55 -0400 Received: from mail-pl1-f195.google.com ([209.85.214.195]:38808 "EHLO mail-pl1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726001AbfDINvz (ORCPT ); Tue, 9 Apr 2019 09:51:55 -0400 Received: by mail-pl1-f195.google.com with SMTP id f36so4969926plb.5; Tue, 09 Apr 2019 06:51:55 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; 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=SCidl0ShTZTmmr2d4YPh3KjkANWqBwxXpacidV7HU18=; b=HhCFIWnEC9BClNJlCaSU3ePUEWNkhOKTfnr5zLxPqw4P5kMnktmhwBNsX09T8mpvlV RSt1JDzL8harwbfc8NO3RTfSmTD/h74mTnMziqjVo4LPzglYW1EX8aqwTWUwMmBmyKa0 IGi6OJzDKAG+BJISkmsdxATrDU0n3XCg+2wqciQuFDXfNj0j4++7GySJTTHZtQbiBQZa Dx5FuE6un0kM5URv5ME6re7eXF6V9JgRYoZVcQ1IBj6GQK90qc16qSU3CvANHyjsPLQ9 BQ4CtNzcDbsvxIug0W8MdBhRiE9p7/IBCWr++BGAdCgVout71tWDsmzGbYvAUk4v01wO KgMQ== X-Gm-Message-State: APjAAAUfpo/HE0xId7AoolsQ64v5SS13srnt/Zfjb7bYY0fvMh2bUP7H ODud/HxHySDcqy/6DS4AZ5jUe8oO9qg= X-Google-Smtp-Source: APXvYqwA5twtqp5e+ljk86BNTg5IAq0k+UOmKcg2YC84m3XN75I1p+5DY/wI0w0imi3tsr2mVc1sAA== X-Received: by 2002:a17:902:e4:: with SMTP id a91mr18984539pla.2.1554817914853; Tue, 09 Apr 2019 06:51:54 -0700 (PDT) Received: from asus.site ([2601:647:4000:5dd1:a41e:80b4:deb3:fb66]) by smtp.gmail.com with ESMTPSA id q87sm50952507pfa.133.2019.04.09.06.51.53 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 09 Apr 2019 06:51:54 -0700 (PDT) Subject: Re: [PATCH] block: Revert v5.0 blk_mq_request_issue_directly() changes To: Stewart Smith , Jens Axboe Cc: linux-block@vger.kernel.org, Christoph Hellwig , Christoph Hellwig , Ming Lei , Jianchao Wang , Hannes Reinecke , Johannes Thumshirn , James Smart , Dongli Zhang , Laurence Oberman , stable@vger.kernel.org, Joel Stanley References: <20190404170843.83517-1-bvanassche@acm.org> <87y34jwykf.fsf@linux.vnet.ibm.com> From: Bart Van Assche Message-ID: <17e00997-fd0c-686c-1c0d-f57fff8e52ea@acm.org> Date: Tue, 9 Apr 2019 06:51:52 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <87y34jwykf.fsf@linux.vnet.ibm.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On 4/8/19 10:13 PM, Stewart Smith wrote: > At least when this patch is cherry-picked back on top of 5.0.7, it > doesn't seem to fully fix the problem for us (which is ppc64le). We hit > this at some point while eudev is finding disks and we have a process > mounting them to see what's there: > > cpu 0x4a: Vector: 400 (Instruction Access) at [c000203ff398b100] > pc: c0000000021fe700 > lr: c0000000002001d8: blk_mq_complete_request+0x34/0x138 > sp: c000203ff398b390 > msr: 9000000010009033 > current = 0xc000203ff3901b00 > paca = 0xc000203fff7f3680 irqmask: 0x03 irq_happened: 0x01 > pid = 658, comm = kworker/u257:2 > Linux version 5.0.7-openpower1 (hostboot@gfw275.aus.stglabs.ibm.com) (gcc version 6.5.0 (Buildroot 2019.02.1-00016-ge01dcd0)) #2 SMP Mon Apr 8 09:14:53 CDT 2019 Can you bisect this crash? Thanks, Bart.