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=-4.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 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 33321C433E6 for ; Tue, 12 Jan 2021 09:22:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E762422DFB for ; Tue, 12 Jan 2021 09:22:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390785AbhALJWv (ORCPT ); Tue, 12 Jan 2021 04:22:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55532 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731334AbhALJWu (ORCPT ); Tue, 12 Jan 2021 04:22:50 -0500 Received: from mail-pl1-x636.google.com (mail-pl1-x636.google.com [IPv6:2607:f8b0:4864:20::636]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 88EECC061786 for ; Tue, 12 Jan 2021 01:22:10 -0800 (PST) Received: by mail-pl1-x636.google.com with SMTP id be12so1093318plb.4 for ; Tue, 12 Jan 2021 01:22:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=VebTyXxUx1aA8dMYN70HrF1ZTcfdGnRg21M2nbc+SqY=; b=XeeqBHroWmg0WHc9ePr8LgxyiDOVRspq23QH5WWNlHEdrBPcfXE+NXvePXQL86uzbB oob8eju284X4VQI7UbVQuk2TB/synix67MZY5KSiEYZwWUF/I6ms23XaoWnfqfZxAP5k 42v04clFEtE+F9/rl814T8siAXLQGt/T1nZ0FltMrU7hg/sLNgLX19Q2rijt39D+riyd bj/UPD1YXqJhaSyHlVDIiNtHybQb9+KqrsjeY+MFB5UwDxHeGg5OPEaPXX+5MkTEwT9t E2txo42cHtEPnW8oyuNTHQwvML3D9SAfpNfd6wt2PU5ZO8qaMro2hTosjkNiQ33/bZDt Y/jw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=VebTyXxUx1aA8dMYN70HrF1ZTcfdGnRg21M2nbc+SqY=; b=MyYkhMIHjfokH5NCIVHboNGf7tbNPP4D08JnLBS4B9utSD9ZIVf1hR9O1qUcIwgSsI YP93ef5ZfcrSkL0A+A/OArIIqfcqBLcsAXHIWqHR5P/BJAXLfm7VoJs83/WRWyqJbFnU 1GWwb76K9r2xvp8PH1zG4g07qqKEOhQp9B4W1qo/1m9NcCeTWuv41rN51YPi79k0Sq3O 4eSNgq6i9On6TSBw3cUqIfkxSI2E7Mrg4Fzj9x6zD0FQffp/NeCUYG5Pddm/K/hZud+9 Hgo5w/xj9Z6mQFkg7gpEbe8BfYtbcxvE9edQpVr4PSa6mXlUbikw8AUV/3V1qcZXJnxa rvIg== X-Gm-Message-State: AOAM530Tk9NOjTyElBbtbkLDqNv/6zwkuSeXNCGaMf6V7+QtwB7Ghisw C92uvzKFSwi+pO/3BAcxQG0= X-Google-Smtp-Source: ABdhPJzfLDe0FU6u83usjW+/EFiSJ+gXbgqE6Bfzxy2jqiJJ/cTE4L7QjZiplrEWCSvHchCtw+RoFw== X-Received: by 2002:a17:902:a710:b029:dc:3817:e7c2 with SMTP id w16-20020a170902a710b02900dc3817e7c2mr4337864plq.0.1610443330082; Tue, 12 Jan 2021 01:22:10 -0800 (PST) Received: from localhost ([211.108.35.36]) by smtp.gmail.com with ESMTPSA id d203sm2464165pfd.148.2021.01.12.01.22.09 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Tue, 12 Jan 2021 01:22:09 -0800 (PST) Date: Tue, 12 Jan 2021 18:22:07 +0900 From: Minwoo Im To: Javier =?utf-8?B?R29uesOhbGV6?= Cc: linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, hch@lst.de, kbusch@kernel.org, sagi@grimberg.me Subject: Re: nvme: enable char device per namespace Message-ID: <20210112092207.GA4888@localhost.localdomain> References: <20201216181828.21040-1-javier.gonz@samsung.com> <20210111185347.oqqzdmoglg3lzo5y@mpHalley.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20210111185347.oqqzdmoglg3lzo5y@mpHalley.localdomain> User-Agent: Mutt/1.11.4 (2019-03-13) Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Hello Javier, I tested this patch based on nvme-5.11: [ 1.219747] BUG: unable to handle page fault for address: 0000000100000041 [ 1.220518] #PF: supervisor read access in kernel mode [ 1.220582] #PF: error_code(0x0000) - not-present page [ 1.220582] PGD 0 P4D 0 [ 1.220582] Oops: 0000 [#1] SMP PTI [ 1.220582] CPU: 0 PID: 7 Comm: kworker/u16:0 Not tainted 5.11.0-rc1+ #46 [ 1.220582] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 [ 1.220582] Workqueue: nvme-wq nvme_scan_work [ 1.220582] RIP: 0010:nvme_ns_id_attrs_are_visible+0x10f/0x152 [ 1.220582] Code: 81 7d d0 80 f9 a1 82 74 0a 48 81 7d d0 a0 f9 a1 82 75 50 48 8b 45 e8 48 89 45 f8 48 8b 45 f8 48 83 e8 60 48 8b 80 60 03 00 00 <48> 8b 40 40 48 3d e0 d1 4d 82 74 07 b8 00 00 00 00 eb 2e 48 8b 45 [ 1.220582] RSP: 0000:ffffc90000047b70 EFLAGS: 00010282 [ 1.220582] RAX: 0000000100000001 RBX: ffffffff824ddb20 RCX: 0000000000000124 [ 1.220582] RDX: ffff8881026eac00 RSI: ffffffff82a1f980 RDI: ffff888102745058 [ 1.220582] RBP: ffffc90000047ba8 R08: ffff888102948718 R09: 0000000000000000 [ 1.220582] R10: 0000000000000000 R11: ffff888100465080 R12: ffff888102745058 [ 1.220582] R13: ffff888102948600 R14: 0000000000000000 R15: ffffffff82a1f548 [ 1.220582] FS: 0000000000000000(0000) GS:ffff88842fc00000(0000) knlGS:0000000000000000 [ 1.220582] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1.220582] CR2: 0000000100000041 CR3: 000000000280c001 CR4: 0000000000370ef0 [ 1.220582] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1.220582] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 1.220582] Call Trace: [ 1.220582] internal_create_group+0xde/0x390 [ 1.220582] internal_create_groups.part.4+0x3e/0xa0 [ 1.220582] device_add+0x3cf/0x830 [ 1.220582] ? cdev_get+0x20/0x20 [ 1.220582] ? cdev_purge+0x60/0x60 [ 1.220582] cdev_device_add+0x44/0x70 [ 1.220582] ? cdev_init+0x50/0x60 [ 1.220582] nvme_alloc_chardev_ns+0x187/0x1eb [ 1.220582] nvme_alloc_ns+0x367/0x460 [ 1.220582] nvme_validate_or_alloc_ns+0xe2/0x139 [ 1.220582] nvme_scan_ns_list+0x113/0x17a [ 1.220582] nvme_scan_work+0xa5/0x106 [ 1.220582] process_one_work+0x1dd/0x3e0 [ 1.220582] worker_thread+0x2d/0x3b0 [ 1.220582] ? cancel_delayed_work+0x90/0x90 [ 1.220582] kthread+0x117/0x130 [ 1.220582] ? kthread_park+0x90/0x90 [ 1.220582] ret_from_fork+0x22/0x30 [ 1.220582] Modules linked in: [ 1.220582] CR2: 0000000100000041 [ 1.220582] ---[ end trace b1f509a1bbfbc113 ]--- [ 1.220582] RIP: 0010:nvme_ns_id_attrs_are_visible+0x10f/0x152 [ 1.220582] Code: 81 7d d0 80 f9 a1 82 74 0a 48 81 7d d0 a0 f9 a1 82 75 50 48 8b 45 e8 48 89 45 f8 48 8b 45 f8 48 83 e8 60 48 8b 80 60 03 00 00 <48> 8b 40 40 48 3d e0 d1 4d 82 74 07 b8 00 00 00 00 eb 2e 48 8b 45 [ 1.220582] RSP: 0000:ffffc90000047b70 EFLAGS: 00010282 [ 1.220582] RAX: 0000000100000001 RBX: ffffffff824ddb20 RCX: 0000000000000124 [ 1.220582] RDX: ffff8881026eac00 RSI: ffffffff82a1f980 RDI: ffff888102745058 [ 1.220582] RBP: ffffc90000047ba8 R08: ffff888102948718 R09: 0000000000000000 [ 1.220582] R10: 0000000000000000 R11: ffff888100465080 R12: ffff888102745058 [ 1.220582] R13: ffff888102948600 R14: 0000000000000000 R15: ffffffff82a1f548 [ 1.220582] FS: 0000000000000000(0000) GS:ffff88842fc00000(0000) knlGS:0000000000000000 [ 1.220582] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1.220582] CR2: 0000000100000041 CR3: 000000000280c001 CR4: 0000000000370ef0 [ 1.220582] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1.220582] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 And this happens when CONFIG_NVME_MULTIPATH=y configured. Please refere attached log up there :) Thanks!