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 17511C32789 for ; Sun, 21 Aug 2022 21:21:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231790AbiHUVVS (ORCPT ); Sun, 21 Aug 2022 17:21:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51444 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229541AbiHUVVQ (ORCPT ); Sun, 21 Aug 2022 17:21:16 -0400 Received: from mail-pl1-f181.google.com (mail-pl1-f181.google.com [209.85.214.181]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ABFDB17041; Sun, 21 Aug 2022 14:21:15 -0700 (PDT) Received: by mail-pl1-f181.google.com with SMTP id jl18so8324103plb.1; Sun, 21 Aug 2022 14:21:15 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:in-reply-to:from:references:to :content-language:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc; bh=7hWEQ4EyGrRlJd2RpmmrF42tsj+N1vQRBA8ec0fDmQE=; b=2p+AKm/KqEATA+2e3U89K2iCFPV9Teefa4rUkgaqoB/J5sOC3OCd7435BJJgg5oxo2 RSZWaOf/V3c9lHKhTI7uFHnjPf5Fj6gKxIVohL6WSovCnv91Z46Ot5sauUOhpg0nhx+F 3JL5EL7ylbzFC8GHiM6dK1w2QUwSRlNCZY+4OG8imvovAeSYQB/QMYq9augAM2L0/N82 8yyxIkjUDPXoEN8ZzervGPjGs0PY5dC7x+fHTQ14eqLePv0hfg+TfJLLUFkiZR0Ivb4W tgY0ZPdvaHlAiIZUV7ZaWO3Le3IAhaIIlHpzPkWzAYSSNOoN0jgYq66pT7CsBlCG6htE 95ag== X-Gm-Message-State: ACgBeo36BXycVy9hvJaXAA/p/0zcus3AWiEAyQnS1gCziEzNuzufYMCT sIUvkRIYvsw9K996u2K3UGQ= X-Google-Smtp-Source: AA6agR4uHOqkTf6kXuwBojmUlIiwF4wVtPSsNuZgfMB7eWC5G9MgAQXxJkifsxYxjVOfyVEUbxSdug== X-Received: by 2002:a17:902:7242:b0:171:398d:9e66 with SMTP id c2-20020a170902724200b00171398d9e66mr17673380pll.19.1661116874959; Sun, 21 Aug 2022 14:21:14 -0700 (PDT) Received: from [192.168.3.217] ([98.51.102.78]) by smtp.gmail.com with ESMTPSA id j7-20020a170903024700b00172ea8ff334sm901640plh.7.2022.08.21.14.21.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 21 Aug 2022 14:21:13 -0700 (PDT) Message-ID: <400efea9-1635-25e9-8924-1813bb8e9d4f@acm.org> Date: Sun, 21 Aug 2022 14:21:12 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.1.2 Subject: Re: [syzbot] INFO: task hung in scsi_remove_host Content-Language: en-US To: syzbot , jejb@linux.ibm.com, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, martin.petersen@oracle.com, syzkaller-bugs@googlegroups.com, Ming Lei References: <000000000000b5187d05e6c08086@google.com> From: Bart Van Assche In-Reply-To: <000000000000b5187d05e6c08086@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 8/21/22 06:42, syzbot wrote: > INFO: task kworker/1:3:3625 blocked for more than 143 seconds. > Not tainted 6.0.0-rc1-syzkaller-00399-g15b3f48a4339 #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:kworker/1:3 state:D stack:24520 pid: 3625 ppid: 2 flags:0x00004000 > Workqueue: usb_hub_wq hub_event > Call Trace: > > context_switch kernel/sched/core.c:5182 [inline] > __schedule+0xadf/0x52b0 kernel/sched/core.c:6494 > schedule+0xda/0x1b0 kernel/sched/core.c:6570 > scsi_remove_host+0x348/0x440 drivers/scsi/hosts.c:199 > quiesce_and_remove_host drivers/usb/storage/usb.c:867 [inline] > usb_stor_disconnect+0x115/0x260 drivers/usb/storage/usb.c:1087 > usb_unbind_interface+0x1d8/0x8e0 drivers/usb/core/driver.c:458 > device_remove drivers/base/dd.c:520 [inline] > device_remove+0x11f/0x170 drivers/base/dd.c:512 > __device_release_driver drivers/base/dd.c:1209 [inline] > device_release_driver_internal+0x4a1/0x700 drivers/base/dd.c:1235 > bus_remove_device+0x2e3/0x590 drivers/base/bus.c:529 > device_del+0x4f3/0xc80 drivers/base/core.c:3704 > usb_disable_device+0x356/0x7a0 drivers/usb/core/message.c:1419 > usb_disconnect.cold+0x259/0x6ed drivers/usb/core/hub.c:2235 > hub_port_connect drivers/usb/core/hub.c:5197 [inline] > hub_port_connect_change drivers/usb/core/hub.c:5497 [inline] > port_event drivers/usb/core/hub.c:5653 [inline] > hub_event+0x1f86/0x4610 drivers/usb/core/hub.c:5735 > process_one_work+0x991/0x1610 kernel/workqueue.c:2289 > worker_thread+0x665/0x1080 kernel/workqueue.c:2436 > kthread+0x2e4/0x3a0 kernel/kthread.c:376 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 > Hi Ming, Do you agree that the issue reported above should be fixed by reverting the patch series "scsi: core: Call blk_mq_free_tag_set() earlier"? Thanks, Bart.