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=-16.4 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS, USER_IN_DEF_DKIM_WL autolearn=ham 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 90A77C43461 for ; Wed, 16 Sep 2020 20:48:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 311F5206BE for ; Wed, 16 Sep 2020 20:48:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="Ifa6dtsW" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728403AbgIPUsi (ORCPT ); Wed, 16 Sep 2020 16:48:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35714 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728307AbgIPUsf (ORCPT ); Wed, 16 Sep 2020 16:48:35 -0400 Received: from mail-pj1-x1032.google.com (mail-pj1-x1032.google.com [IPv6:2607:f8b0:4864:20::1032]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 40BAAC06174A for ; Wed, 16 Sep 2020 13:48:35 -0700 (PDT) Received: by mail-pj1-x1032.google.com with SMTP id t7so74609pjd.3 for ; Wed, 16 Sep 2020 13:48:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:from:date:message-id:subject:to:cc; bh=uPX6rKTdxLnDni+VW8OY4PDbBwwIGPh/qDCu4Axfn9Y=; b=Ifa6dtsWASq60dAP4HrHNhDkxjS/xmmyHGePZzYePu71a8jCV5+96pjCOedjPhMvxl N1QdvYLQQgbriQgd11wwOvLyhLa/p3nPBSvPA0voQ/Kcd5gJw7vGgP/GrjLjDogBj3Rs qH+9DeYYxHoAepS71WY+z3x0EWTwGCxGItyKQ8rf0ZYjg+v4yJNkK6sfhgSPQAFG8wRX HEfvRMQs75/ZPOc6KOlCXQosNvotAhyxDGcqBMRE9OMSbZhtWFOAIVCb2ibmLGmpBmwd 6Ez4o4qxD6OvHnWv/pAiemG6fC3mVTcvalFfB9XpDyETbIQvTEqyHROqvOMuZASi9g44 4rbQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc; bh=uPX6rKTdxLnDni+VW8OY4PDbBwwIGPh/qDCu4Axfn9Y=; b=OpoOIadQKpxTK/Ests4bzNdptjAnU4eqOQ3UUHSEY14cSb6pLOHrU9kTxrc0JsE8v/ hCOkkKOugzrYUocHnE9xdOsLWJW581vSq6tW7vEa+bA83OwiRYVdCKY+r7jFO/QOl9R9 Wt856JZb1fTuI1u9qFIW34uCZx412T4h6VgNknJeytUTIheQtWtqd2DHFoTCz8FsuPVh m6AvGg19+lz9JU7d1B3PGQ5I4p07ZrpFPIF4C5ePY8KHTnfuO4PVMTsqFxvFnAGzoq5R 9GV0Qqlu4NpMTzgRG8FbofdzuViEihsTwp3KbXmEg41AqrRkmCqd8vctOEncgOHA2003 MvPw== X-Gm-Message-State: AOAM531/PwNX4X+NWVwxjROEaoNOK9gt/it+TUKc5zjLcbJr0D6oqPVq eTXgUdftwCXexs7dvcIw3+GpmBqB85XI/9vXwp6SzQ== X-Google-Smtp-Source: ABdhPJyDCgq8DKDCdk2N/l6JAmDoALogXR6SSjWzCvffybXxW9Blsqexix21sT/EHvKtShppsmOjR3NfvIB3dpc39TI= X-Received: by 2002:a17:902:c3d2:b029:d1:9bc8:15f8 with SMTP id j18-20020a170902c3d2b02900d19bc815f8mr24717552plj.29.1600289314507; Wed, 16 Sep 2020 13:48:34 -0700 (PDT) MIME-Version: 1.0 From: Nick Desaulniers Date: Wed, 16 Sep 2020 13:48:22 -0700 Message-ID: Subject: GPF from __srcu_read_lock() via drm_minor_acquire() To: "Paul E. McKenney" Cc: Will Deacon , Peter Zijlstra , Josh Triplett , Steven Rostedt , Mathieu Desnoyers , jiangshanlai@gmail.com, "Joel Fernandes (Google)" , rcu@vger.kernel.org, clang-built-linux Content-Type: text/plain; charset="UTF-8" Sender: rcu-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org Hey Paul and RCU folks, I noticed we have a bug report from 2 users that seem to have similar stack traces in SRCU code; https://github.com/ClangBuiltLinux/linux/issues/1081 Is there a way we should go about starting to debug this? -- Thanks, ~Nick Desaulniers