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=-2.6 required=3.0 tests=BAYES_05,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 B236AC433E0 for ; Sat, 8 Aug 2020 21:18:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8A407206C3 for ; Sat, 8 Aug 2020 21:18:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="fQL4J7iS" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726250AbgHHVSM (ORCPT ); Sat, 8 Aug 2020 17:18:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45844 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726069AbgHHVSL (ORCPT ); Sat, 8 Aug 2020 17:18:11 -0400 Received: from mail-lj1-x22b.google.com (mail-lj1-x22b.google.com [IPv6:2a00:1450:4864:20::22b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9A3E8C061756 for ; Sat, 8 Aug 2020 14:18:11 -0700 (PDT) Received: by mail-lj1-x22b.google.com with SMTP id v12so5719689ljc.10 for ; Sat, 08 Aug 2020 14:18:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=4rz3hoyI/6Ikm42Z0u/nAcwa3GSGukSjijv1Tmv+cAg=; b=fQL4J7iSSUfgWjy/9cS82PnugeklQzY1zUnMGEcB3/eGTxxB7YH6tzOqKeZFGhZRip Z9WUjMjzexy45G7mPVHVK1kAXomUL3LisQdTY6QJ3hYCHGB4THHGUfcazi4qpRPQDDZf RGbz0G3mACAf+EUuF7827K4NE/DYYmGAHCCee7Yaf8VGxCBQA4d15LSR0FiGXlFAi30L tlQ+cVZWdqnsIkq7rynrOV3cvj6IXcp4yGV9095RNKZTkCS1bjR9UwyGBzhoEZ7HHfkh TpoUNkHOgihLgI6zz5SxszcuvvhsPhw/jAugXi+ILwCvYfkl+/7hznN/qVyks3P53gT0 eanA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to; bh=4rz3hoyI/6Ikm42Z0u/nAcwa3GSGukSjijv1Tmv+cAg=; b=aj5oyjoVS+aIU8p0evk6dFC8hQXbxgvuYd/Hh4I/YwS4F2RVVk8mZ2GsF1c3elaNg3 z7PCyTWOu+GN/V2ky/Jh10jmLHwSO/VpQ9iI1rEjbNTm2IEEnjRrETNa8u0mN6rFXelC HRaYYKRXHheyNuy0owpLGspZ//+TFlCtQ0q2yW6YgNpXTv//9TCkP2UcuT2qHjhGE9Vp uwPx96bbCEr/yNWVvabjfWQP9gn5ObOKiuVMUCJzt2awtQFy2ec9ZtIkS8IxS4SWCKWx hTuTwOwFek/p7XI+rfbQXw1wTF9PLLiZ8aIWRS+1LSCogHEW5wmrj2v2VdrDy3XYnFu/ mp+A== X-Gm-Message-State: AOAM531ivD70ZMDLP61JtBCrvtQzmvmS++ZAAEXBvtDp89GTbwQ4a6EG uL8zaM88/0lZFPQp+h4OxnrbSonFS/aWy4YeW6FOCJpA X-Google-Smtp-Source: ABdhPJya+lxdJb5wYZJMv4khh+bLOAzyXkbf//HHzZlm8tU+yCwYfHfcIUKd5sozqQJZdkaz9L+zk4Kq/O01zH7WpPo= X-Received: by 2002:a2e:9396:: with SMTP id g22mr9900788ljh.446.1596921489731; Sat, 08 Aug 2020 14:18:09 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: William Tambe Date: Sat, 8 Aug 2020 16:17:57 -0500 Message-ID: Subject: Re: delayed_put_task_struct() used through call_rcu() by put_task_struct_rcu_user() never gets called To: rcu@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Sender: rcu-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org On Sat, Aug 8, 2020 at 1:21 PM William Tambe wrote: > > I am having an issue in my kernel where delayed_put_task_struct() used > through call_rcu() by put_task_struct_rcu_user() never gets called. I am able to trace this issue to invoke_rcu_core() not getting called in __call_rcu_core() due to rcu_is_watching() always returning true. Any idea why I am seeing such an issue ? > > Any idea ?