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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 D61B5C433FF for ; Thu, 8 Aug 2019 06:47:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AB6582187F for ; Thu, 8 Aug 2019 06:47:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731048AbfHHGrP (ORCPT ); Thu, 8 Aug 2019 02:47:15 -0400 Received: from mail-wr1-f67.google.com ([209.85.221.67]:43650 "EHLO mail-wr1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725796AbfHHGrO (ORCPT ); Thu, 8 Aug 2019 02:47:14 -0400 Received: by mail-wr1-f67.google.com with SMTP id p13so19138973wru.10 for ; Wed, 07 Aug 2019 23:47:13 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=1NKKMOIVQqV9iFYKB9HtV58xs+QTSWgospSlaS/nYDk=; b=IEi/KW8ifkZKi9RqgemCWeUo9g1yQJTit1cN8+N/uMV5duA7pUJZ1QIeC5BBEMMRTu wM4Dxj5epHhyff6DNLVcjpCwXa1Cmju4QXt/zEC5rMLXgoOVwfXNy2YiYcZXo0Zo3ow4 HSMNNC+mRPa/DIpqDf8prebce6dqzb28bH6jKvkbBtcm+EvuNZKM8810lFE+V3zDaWKp YbRGnOK1V8IGKYE3diPnARW/6Q/quyjRqw5FlJaBxj4FYYOXdHsDepiCbI+ptppvNY2a OS6AZ8mxew1WS2kEubcHpi6vhQyCtH0TN2bFzCLQz2eziBCRvhfCemmr7iiAf6o8BTr7 rAjQ== X-Gm-Message-State: APjAAAV98LLQhy0DCgfk4JKb2cXBtCvsMfxyfXXynZzo8dMrKqi5Mrvo 1zbhDhf1qjgULdgwO377VG6Gdg== X-Google-Smtp-Source: APXvYqwrRU3U8o/LmbRoCWTemjxrlrzgZ05EW/7Ci8indvYGKipc47Etf+6Ab3OenswtztbVM/orgw== X-Received: by 2002:a05:6000:118a:: with SMTP id g10mr14562442wrx.175.1565246832444; Wed, 07 Aug 2019 23:47:12 -0700 (PDT) Received: from localhost.localdomain ([151.29.237.107]) by smtp.gmail.com with ESMTPSA id b15sm111856859wrt.77.2019.08.07.23.47.11 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 07 Aug 2019 23:47:11 -0700 (PDT) Date: Thu, 8 Aug 2019 08:47:09 +0200 From: Juri Lelli To: Steven Rostedt Cc: linux-rt-users , LKML , Thomas Gleixner , Sebastian Andrzej Siewior , Daniel Bristot de Oliveira , Clark Williams Subject: Re: [RT BUG] isolcpus causes sleeping function called from invalid context (4.19.59-rt24) Message-ID: <20190808064709.GC29310@localhost.localdomain> References: <20190805100646.GH14724@localhost.localdomain> <20190807160725.10a554e7@gandalf.local.home> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190807160725.10a554e7@gandalf.local.home> User-Agent: Mutt/1.11.3 (2019-02-01) Sender: linux-rt-users-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rt-users@vger.kernel.org Hi, On 07/08/19 16:07, Steven Rostedt wrote: > On Mon, 5 Aug 2019 12:06:46 +0200 > Juri Lelli wrote: > > > This only happens if isolcpus are configured at boot. > > > > AFAIU, RT is reworking workqueues and 5.x-rt shouldn't suffer from this. > > As a matter of fact, I could verify that backporting the workqueue > > rework all-in change from 5.0-rt [1] fixes this problem. > > So you have backported this and it fixed the bug? Yeah. I did backport it to a downstream kernel and the splat is gone (plus I couldn't spot any other problems my backport might have introduced :). > > I'm thus wondering if there is any plan on backporting the rework to > > 4.19-rt stable, and if that patch has dependencies, or if any alternative > > fix might be found for this problem. > > I could do it after I fix the bug with 4.19.63 merge :-/ (which may be > related. Who knows). Ok, thanks! Best, Juri