Received: by 2002:a05:6a10:206:0:0:0:0 with SMTP id 6csp888619pxj; Fri, 21 May 2021 01:15:39 -0700 (PDT) X-Google-Smtp-Source: ABdhPJx0JXVu1dpm7zTUUTBCxgWC8VyMjoj3nCitvlFWjRbVyXynL3kWQGouv2yahAs0r4kopxiA X-Received: by 2002:a05:6402:1115:: with SMTP id u21mr9860345edv.383.1621584939773; Fri, 21 May 2021 01:15:39 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1621584939; cv=none; d=google.com; s=arc-20160816; b=0+HiO5wyJoa+AmM3bf1cAH4EqSB2EvZexbfqUkiJr+DzH2nqtdLArcEIMWT755ERsI EBs8WvN9rgnOs8MswzOgawe5c8fR4X4yP48JPZBkbA5O2aHWwxy470uR5XC+bWd4cOGu 3wFiu9EJ3MGolfePPpUavwF9xkAl+c1UWU1GIZBrK5dFOtw/RfVleXhTzbjEBGtWoZ4w 36h4v4dKDIeZjbIcTOikhCyfs9TJ+oeXKDUQjVKkYCQavai5zxLK+/DcoIWjSu9Yd+2q RUevXomPT7/H19UJTtiWQsm6dEOvnl4OLHHI7hKCFPS0VdkvkGcbZEaHVnV8gVIKIeKO 8HZw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:subject:cc:to:from:date :dkim-signature; bh=8OcOemnp8JGfhuYCqOjDuoK7Q1Mp8Qvqc/R1CHMHg6E=; b=yS12G020IiixrT46VRilnX15BgmY2En0bWGGXmecJOuPUi2cL/3r9DxMt/MVNCcNJs 10HJgPMaIZ7J2n9Ah29dJKWo3prOBIk3/alFLbdygm5JE9NhV+KinqJQdraptQl8fG+f /AXv+Y3/z7fg+PmB3IgP33+Wk4Y/E/FC5oPXNrSLFqrALpi+vu4LUvam1BScFf+9/kiE YAYHb+ovG0TP3XlRVtyCgq8ZA2MyElhPqXofborb5yhQVXLAU2TYp/PDubAdfvLWDZ57 4Hj9q9IumJf0py5mgBGKTl54bNTsZjYvqzMSoO8M+kr8glyxM5Mt9xoanOo7b8aTc5XT 7i7Q== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linux-foundation.org header.s=korg header.b=WjJdBLSX; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id k9si5086934edv.428.2021.05.21.01.15.15; Fri, 21 May 2021 01:15:39 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@linux-foundation.org header.s=korg header.b=WjJdBLSX; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230494AbhETVuI (ORCPT + 99 others); Thu, 20 May 2021 17:50:08 -0400 Received: from mail.kernel.org ([198.145.29.99]:47376 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230178AbhETVuI (ORCPT ); Thu, 20 May 2021 17:50:08 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 11FF26135C; Thu, 20 May 2021 21:48:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1621547326; bh=HIExzJDeCTXLxAodEv2a/lCkkoLfv2aYG3GY3liZUeo=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=WjJdBLSXjbXTglZrurGg0bUgGIiezJ4smkTavKCQw9SxCn4eXmEiu3T2qrD8mptWk a30RhQWYvdNaUDBVoh03MJF6jtrTHOsldeDRCIfziyCh1jSBmmTiN+5LCi0qus/x4o viis11AavwpZz14MK7H/wO8fc7hOB4P2Vf738ZCw= Date: Thu, 20 May 2021 14:48:45 -0700 From: Andrew Morton To: Martin Liu Cc: Nathan Chancellor , Nick Desaulniers , Petr Mladek , Tejun Heo , minchan@google.com, www@google.com, davidchao@google.com, jenhaochen@google.com, linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com Subject: Re: [PATCH] kthread: Fix kthread_mod_delayed_work vs kthread_cancel_delayed_work_sync race Message-Id: <20210520144845.52755f3af700a902e07e2ee7@linux-foundation.org> In-Reply-To: <20210513065458.941403-1-liumartin@google.com> References: <20210513065458.941403-1-liumartin@google.com> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 13 May 2021 14:54:57 +0800 Martin Liu wrote: > We encountered a system hang issue while doing the tests. The callstack > is as following > > ... > > Fixes: 37be45d49dec2 ("kthread: allow to cancel kthread work") Thanks. I added a cc:stable to this and shall hold it in -mm for a couple of weeks to get exposure and testing before sending it to Linus for 5.13.