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=-3.9 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 BC59FC43461 for ; Tue, 8 Sep 2020 19:20:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 79BE22137B for ; Tue, 8 Sep 2020 19:20:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="yeGdGILu"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="7LSSF/P8" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731946AbgIHTTz (ORCPT ); Tue, 8 Sep 2020 15:19:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54220 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730668AbgIHQCS (ORCPT ); Tue, 8 Sep 2020 12:02:18 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A74D3C061786; Tue, 8 Sep 2020 09:02:17 -0700 (PDT) Date: Tue, 8 Sep 2020 18:02:14 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1599580936; 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=97oj1pCtLhc8GEIScXkD+7t3oCOzOaAxQFhhixXPXYs=; b=yeGdGILuNPEXB5/p4qF0cmCVDKze7lv3D+hxUC2BiCT6JPgkPmoSlYin1TMQFR9vUUkQKv 4KXemeCiJSkkgTxR6LuobNDDMQdl9bA/Lwn5y5Rb8pwvOTjcXRkbnsbSrQKfGz6Dbvrrdr Ru2alBZYhCt3Q7wNBuMNAICWmDZibBJLKAQw+IqAzVBgFirtAIS3ehO0garsyfPHiX/uzY FN5q68u0L89RM60+CEv2reYlTUHdNept+AebIBJI+1lFRqVWoAXLcaMRCMnYIInZAO4Wrm REhfWQY+Q+jdUnrE9bAVrnGJIz09QDkrJxnN0+DuLTZQ0A175sbazDu/5WoWtw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1599580936; 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=97oj1pCtLhc8GEIScXkD+7t3oCOzOaAxQFhhixXPXYs=; b=7LSSF/P8VGb8OFyKhLSf/g7sECVsh9xM22Xon8GdgRlb6KSYTPdHfwFEvQME5g9X3nVfqn qBoLR76pYz7bo9CA== From: Sebastian Andrzej Siewior To: Mike Galbraith Cc: Thomas Gleixner , LKML , linux-rt-users , Steven Rostedt Subject: Re: v5.9-rc3-rt3 boot time networking lockdep splat Message-ID: <20200908160214.p3av2uxt7jjj6rx2@linutronix.de> References: <20200902155557.h2wl2qpfn2rwsofw@linutronix.de> <46a2b89ec8d953a4be18c7389c7d8c66310a7ff0.camel@gmx.de> <20200908151229.g24j4n4fderlm2pe@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: Sender: linux-rt-users-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rt-users@vger.kernel.org On 2020-09-08 17:59:31 [+0200], Mike Galbraith wrote: > > I have no idea how to debug this based on this report. Can you narrow > > it down to something? > > I instrumented what I presume is still this problem once upon a time, > structures containing locks are allocated/initialized/freed again and > again with no cleanup until we increment into the wall. Any idea what it is? > > Is Lappy new, got a new something or has a new config switch? I'm just > > curious if this something or something that was always there but > > remained undetected. > > Nah, this is nothing new. Turn lockdep on in RT, it's just a matter of > time before it turns itself off. It's usually just not _that_ quick. Okay. So I have few boxes which run over the weekend without this splat. > -Mike Sebastian