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 E970AC433F5 for ; Tue, 30 Nov 2021 00:06:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231887AbhK3AJn (ORCPT ); Mon, 29 Nov 2021 19:09:43 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55984 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231165AbhK3AJn (ORCPT ); Mon, 29 Nov 2021 19:09:43 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 07FE5C061574 for ; Mon, 29 Nov 2021 16:06:24 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 38BF7B80954 for ; Tue, 30 Nov 2021 00:06:20 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 522B7C58321; Tue, 30 Nov 2021 00:06:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1638230779; bh=lYhzlhKARfaov7ychHRylbwZBTbCYlOzT1a2yNoU1h8=; h=From:To:Cc:Subject:Date:From; b=RACxxlvC1VspiNCZYubIkHNtf0IsNWwZ0lA+AE1L7OpKnpYfFGRAfEOEsai7D0d9h oEMbU6HZtQBMVn8cQKcNSvRHjRO6P5S7op0luKg2/hEnyk7AA55r186Llc5znSBJuY fwNJQrkLHHpoUndKQ7RrQc2E8pAWUTrTWejfWKyQT9x0v1VgP8pGTWGz7XmH09Bq8O qLIdKcgXKY7Kqmz+chvoTgWT1YZLIPt+jJ4eeHYvBd+MHEt8dCJ5M80ynIHfW5xc5I ezmRUY4YT4jsPLARQOnQwOHxcSznyw/sMeakbkUY3hUCBU8cxHMVISCFmbagAzn0+9 d5+LXBBbXWNlA== From: Frederic Weisbecker To: Tejun Heo , Lai Jiangshan Cc: LKML , Frederic Weisbecker , "Paul E . McKenney" Subject: [RFC PATCH 0/2] workqueue: Fix hotplug races Date: Tue, 30 Nov 2021 01:06:10 +0100 Message-Id: <20211130000612.591368-1-frederic@kernel.org> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org While triggering rcutorture splats, I couldn't trace down to the exact cause due to the issue being tracing-unfriendly. But looking at the code, those two potential races look like plausible causes and also after these two patches, I couldn't reproduce the rcutorture issues again (yet...). Frederic Weisbecker (2): workqueue: Fix unbind_workers() VS wq_worker_running() race workqueue: Fix unbind_workers() VS wq_worker_sleeping() race kernel/workqueue.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) -- 2.25.1