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=-8.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS 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 F213FC2D0A3 for ; Wed, 4 Nov 2020 10:00:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7BACD22206 for ; Wed, 4 Nov 2020 10:00:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="nhnktz3P"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="82Ck8bCS" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728437AbgKDKAw (ORCPT ); Wed, 4 Nov 2020 05:00:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59540 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726434AbgKDKAv (ORCPT ); Wed, 4 Nov 2020 05:00:51 -0500 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6C04FC0613D3; Wed, 4 Nov 2020 02:00:51 -0800 (PST) From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1604484049; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Q22pwsM6Tj1e0wp7DHmM0yF6sfQnnx66IYQwrUyKPjs=; b=nhnktz3P0gZM+rjMsMcZ5kltHAUM1F/6Dr0BKbAhD98nRv8KkAk9f5fITxx9tES7cDs7Zo 0HVDtox5v/Ax0X/+zpDYO4a+52EFP+79sPTLAdgXaZrrCf0lHxWNCV9KFPN0P3//0CgVJ5 0pLWEgWC091auw2dWcqKwSBN3XLoBBNrbL2Y4oLc7DGtIgmehR8AiRj2nvVMiP/moTCzKf CsfhBJztAqM705AR9We4UzIxpOJJSWDDsMhSi3cYWwObOysrOVAGpPXmfoPoi797El2H5l dpUqVrIQF6ynua8arqZz9THL6wHGQd+L/9NNKPNof6IYMt97ratAOInnVCGsDw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1604484049; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Q22pwsM6Tj1e0wp7DHmM0yF6sfQnnx66IYQwrUyKPjs=; b=82Ck8bCSuZedBxpRO91qHX94plmSW0hsbkBVa9zsfns3HU/kYX6O035x5SGqQmTGGqcFfc DUjrle6GW7oODMBQ== To: Gratian Crisan , Peter Zijlstra Cc: linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org, Brandon Streiff , Ingo Molnar , Darren Hart , James Minor , Sebastian Andrzej Siewior Subject: Re: BUG_ON(!newowner) in fixup_pi_state_owner() In-Reply-To: <878sbixbk4.fsf@ni.com> References: <87a6w6x7bb.fsf@ni.com> <878sbixbk4.fsf@ni.com> Date: Wed, 04 Nov 2020 11:00:49 +0100 Message-ID: <877dr1mofi.fsf@nanos.tec.linutronix.de> MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Nov 03 2020 at 17:31, Gratian Crisan wrote: > I apologize for waking up the futex demons (and replying to my own > email), but ... I was staring at it already but couldn't wrap my head around it. > Gratian Crisan writes: > I was able to reproduce the BUG_ON(!newowner) in fixup_pi_state_owner() > with a 5.10.0-rc1-rt1 kernel (currently testing 5.10.0-rc2-rt4). > > I've captured the reproducer, boot messages, OOPS, full event ftrace > dump and some kgdb info here: https://github.com/gratian/traces > > The abbreviated OOPS (w/o the ftrace dump since it's too large to > include inline; see link[1]): Let me start at that then. Thanks, tglx