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[2620:137:e000::1:20]) by mx.google.com with ESMTP id s17-20020a170902ea1100b001636be51af5si42895268plg.258.2022.06.10.05.52.35; Fri, 10 Jun 2022 05:52:52 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20210112 header.b=qoZTrQOJ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236360AbiFJMsg (ORCPT + 99 others); Fri, 10 Jun 2022 08:48:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37466 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233412AbiFJMse (ORCPT ); Fri, 10 Jun 2022 08:48:34 -0400 Received: from mail-yb1-xb31.google.com (mail-yb1-xb31.google.com [IPv6:2607:f8b0:4864:20::b31]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 680B321E1B for ; Fri, 10 Jun 2022 05:48:32 -0700 (PDT) Received: by mail-yb1-xb31.google.com with SMTP id e184so46823391ybf.8 for ; Fri, 10 Jun 2022 05:48:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:from:date:message-id:subject:to:cc; bh=Sfhj5wdwRUjdvuShztWnVmtciB4bmqpt/yCTTC/qT1Q=; b=qoZTrQOJJqrmNKCLNaP7NcaBbh6iuWsbFYB4xngaH5zEuOzNZW6X3YyQT+0y+znjuR 6QqH53aKiZ0M6kT8bMm5wk4M2Y7q6LbjfmYtl2kHAxSbgXzm9cPQqj8I1+HQOlC6KukY 3rxaQFs1KPUP8o9qvjb5DsegfPRckr9Op4Diqhg6tyzHowUpPFO5Z4nj4YqEcS6LtBTs kfPImQh6bzaT+3Wbuy/KCB8B2VTUIFcIW87uswO5foKzxgyADBNrDPlCGSxNW6vqeKya r16heKxo6iDywBjlZy/PuvQ7l3ebsiOZnpia3wOvhoAmX1VEEQAgsur91muSJ53DrknD eSmw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc; bh=Sfhj5wdwRUjdvuShztWnVmtciB4bmqpt/yCTTC/qT1Q=; b=nHDxVTXVjQfVNV8m15kBMyUcTYIV4odxUxO1M+uLdZPEKlJKcQVuKWWKUideibuG8e oghAGjAO3flmuWSkeFGOgF89uBDRo9FerYi45szAgSYxMJQ+0SCyuJLBYz6eldBqSp6N pFt9x17sjqGb5XJMby3QwQWbHNACWlBL632Xbqjqq6dkFFLY09gQ2buGmLeSHjDcaCe2 67f2c9FMfeKjaqEM2y8Ndg/XXaTp+FIesUSArEVpXMDg3Li40MitEZ01Gwj+q68YWHZx M7iuwCHV8EuZ1raP3cjxk0AWZ0p0zsunHVmt3/cy7yG50Xli43qetHX5vQwOvrPixcl2 nEEQ== X-Gm-Message-State: AOAM533Wobagk+WVOb7cQsc3Na3/8vKL1Z7GWlQz/mLqTAZwqJNMMVyD L6PJe8oobeYqmGJ+3nJvSln1/k+1BsU0imYpsYs= X-Received: by 2002:a25:7611:0:b0:65c:b595:2822 with SMTP id r17-20020a257611000000b0065cb5952822mr43370508ybc.228.1654865311641; Fri, 10 Jun 2022 05:48:31 -0700 (PDT) MIME-Version: 1.0 From: Peter Geis Date: Fri, 10 Jun 2022 08:48:18 -0400 Message-ID: Subject: [BUG] Threaded printk breaks early debugging To: John Ogness Cc: Petr Mladek , Sergey Senozhatsky , Linux Kernel Mailing List , "open list:ARM/Rockchip SoC..." Content-Type: text/plain; charset="UTF-8" X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Good Morning, First, I love this patch from a functional standpoint! However I've run into an issue debugging early boot issues. Anything that causes the kernel threading system to die (for example here, a NPE) causes the boot console to halt before it outputs the error. Would it be possible to have both a kconfig option and a runtime option to toggle printk_fallback_preferred_direct()? Currently I've had to force it at all times while debugging. Thanks again for this amazing work! Very Respectfully, Peter Geis