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=-5.9 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, 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 351C7C07E96 for ; Mon, 12 Jul 2021 02:44:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 11F5B61042 for ; Mon, 12 Jul 2021 02:44:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232650AbhGLCrB (ORCPT ); Sun, 11 Jul 2021 22:47:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33260 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229818AbhGLCrA (ORCPT ); Sun, 11 Jul 2021 22:47:00 -0400 Received: from mail-io1-xd31.google.com (mail-io1-xd31.google.com [IPv6:2607:f8b0:4864:20::d31]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1A690C0613DD for ; Sun, 11 Jul 2021 19:44:13 -0700 (PDT) Received: by mail-io1-xd31.google.com with SMTP id x10so1883711ion.9 for ; Sun, 11 Jul 2021 19:44:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=cGFiv7gjKS/coi5aJJpg41m9zEcOwLxKxLukz6tL1x0=; b=DLgbISg7gyCl7ZXor+S8BkOAEUD6oyaPTrkxn0BWknkR/xC3kQQKr636HJWGVCA35f 2vAfRgTpm4Nr7ZkaZRAutdCktOdCb1OZsCSR1O2nCOHdDONtOmUy4HZ3Bms7fMAtrBfb JXGf3BTiRvF1LYrM8vQAN86AvyBXsuUDA3n7BN31haXQxPwsnRog60ZhrJS2EbQfIEYL 9qf/EBm3YMDm0p7GT/Tj7ouT524NmrbHlAFQ25Hdwbq+J9HAUiN14QKB5x30n38wZpqa ICpRzREnlHrOFc+5BvvL856Qm9aIqkxf5A1sgAlVUv5t6sjVN41OELIrGXrap358t7U5 hO0g== 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=cGFiv7gjKS/coi5aJJpg41m9zEcOwLxKxLukz6tL1x0=; b=nLbIe70oxedwsL/+w/qow8V+yElYzr5pg2hzMctV7V1RH7VFk88pmuNkEZ+Q5C2AxT tEUL8Q3R+t9yMzg6PVBqXozryVZy4z6U+tH4yAN6TKO9MciVMSvxKVZsfwz0ehy3WaLO jfS8FeJRR6t0I6/cHxoI3zWuyULhYKzxy+SPLIO3tCtx4lHwVC1EVPR8yksIkWUeKIwd 0Fodz8si3Qik/cDnTsHU75VdTAk9ryqE8kyXrCCj/gmOss0c2+At9zyNiXf9p6i6GtYw Ht50UQ0hnurbBs25JHDu+QOg1K4MCzshIheQj1owaX19SoeFZLhR/uKRFWx2XuK2fUs6 KbMQ== X-Gm-Message-State: AOAM533F8Wly05Gef9GSgrDn5bNLZrUyUpcmp4Q9rHzZwgrXEHPffrJm oILc0tUw/JvFGKSL1OJtgPVv7Q== X-Google-Smtp-Source: ABdhPJxmwkVyegwrxSnmiyTCxVLd+xZASrnHAbbn5aSBQUnBSirKoWr/P152+mgIu53A0zPrU8//Aw== X-Received: by 2002:a05:6638:3181:: with SMTP id z1mr4565512jak.100.1626057852476; Sun, 11 Jul 2021 19:44:12 -0700 (PDT) Received: from [192.168.1.134] ([198.8.77.61]) by smtp.gmail.com with ESMTPSA id b9sm7489447ilo.23.2021.07.11.19.44.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 11 Jul 2021 19:44:11 -0700 (PDT) Subject: Re: [PATCH] task_work: return -EBUSY when adding same work To: zhenguo yao Cc: oleg@redhat.com, linux-kernel@vger.kernel.org, yaozhenguo@jd.com References: <20210709122712.42844-1-yaozhenguo1@gmail.com> <872612b5-b9c6-43aa-a167-1c204d0f1c5a@kernel.dk> From: Jens Axboe Message-ID: Date: Sun, 11 Jul 2021 20:44:20 -0600 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-kernel@vger.kernel.org On 7/11/21 8:13 PM, zhenguo yao wrote: > Yes I hit this condition. The caller is queue_task_work in > arch/x86/kernel/cpu/mce/core.c. > It is really a BUG. I have submitted another patch to fix it: > https://lkml.org/lkml/2021/7/9/186. That patch seems broken, what happens if mce_kill_me is added already, but it isn't the first work item in the list? -- Jens Axboe