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=-0.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED 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 56A06C433DF for ; Thu, 14 May 2020 12:31:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 320A4206DA for ; Thu, 14 May 2020 12:31:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lca.pw header.i=@lca.pw header.b="j0Hz9qCf" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726281AbgENMbP (ORCPT ); Thu, 14 May 2020 08:31:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45114 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1726124AbgENMbP (ORCPT ); Thu, 14 May 2020 08:31:15 -0400 Received: from mail-qk1-x743.google.com (mail-qk1-x743.google.com [IPv6:2607:f8b0:4864:20::743]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5D5CBC061A0F for ; Thu, 14 May 2020 05:31:15 -0700 (PDT) Received: by mail-qk1-x743.google.com with SMTP id g185so2716585qke.7 for ; Thu, 14 May 2020 05:31:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lca.pw; s=google; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=rXUjuNQKfOwsiQsnf8kbEEKYDtZNdCEYADSwV7JyE7o=; b=j0Hz9qCfXTLgLzIb9XaI9TvQpOF1a6NwMMd45yEfuG2KvgPFo6tcD9kq+QTG7iYcHG zqtXbZxaeOLZ/XJxQYjZYhzCrqEmNUaMhi5ke4EVXIJmZs9SW71o2KOa+w6cU0UuWpWO GIu8Ee81QOUYF7Mgx0P4/U/JvznK9Pdd0hf+Nq3BYmiu8iXA8aO0lyGQjoyJKg8PuC5+ UhLhLS2Q0EiHfWpeVANgZGDEifWR0YTOC4uahsyk9tB1aldhrinJBhv9aHngCgN2QICl eOQvGHPHsNjnVhPh6d3G+WippDrI15t/w+MzTrap5e0Lq2t+9o+F1TiSUnNlhY+2uE6S qA9w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=rXUjuNQKfOwsiQsnf8kbEEKYDtZNdCEYADSwV7JyE7o=; b=TTm0ekssun16kf00pxQDcz7k/1kMNLha+jy8m1kDxXd/NtdTce8pQ9IyEknXpR3z8d TFsFwTRhUXG40mHPAstqqYXvwb9cSbcWRN0lTwyU+iregYaJxdwP7Wb9Jd+cJ3M1pELR F3ysGMftdxuu2TVobHMTWvEQKh3G1iydHrw+1EFpWKgoahgdurf7UiaalMaHeXixaPJU OMRsAdvD7LkQ3iAjh7ljP5Fy4/HKwJjNbpIq2Yktl7el1y5KEeLA8DLQk50k9fE4W5SB z/DmUYn6FZPzydjpsucDAwU3kFurt9XALFXB8ApleO5dlCMRYhh7J6YdRzk23Xs5uvIu GYPQ== X-Gm-Message-State: AOAM5312ogU7JjTVGuZtEnbBysGJ9fW5TI/LRNcqzMLAeFMFcVOlOoOy Do2jOh8iFT9uyIdAkxH1ThaiJw== X-Google-Smtp-Source: ABdhPJzsfUagLYdd1iwZS5RuppqKxjj13xRYfKcnhxCAlq+6SV9PHRT4cvrmZGXg9GEM2JjXGkHL9g== X-Received: by 2002:a37:78c1:: with SMTP id t184mr4527270qkc.213.1589459474634; Thu, 14 May 2020 05:31:14 -0700 (PDT) Received: from [192.168.1.153] (pool-71-184-117-43.bstnma.fios.verizon.net. [71.184.117.43]) by smtp.gmail.com with ESMTPSA id l184sm1047116qke.115.2020.05.14.05.31.13 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 14 May 2020 05:31:13 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) Subject: Re: Default enable RCU list lockdep debugging with PROVE_RCU From: Qian Cai In-Reply-To: <20200514222535.259cb69e@canb.auug.org.au> Date: Thu, 14 May 2020 08:31:13 -0400 Cc: "Paul E. McKenney" , Linux Next Mailing List , Linux Kernel Mailing List , Madhuparna Bhowmik , Amol Grover , Dmitry Vyukov Content-Transfer-Encoding: quoted-printable Message-Id: References: <20200514222535.259cb69e@canb.auug.org.au> To: Stephen Rothwell X-Mailer: Apple Mail (2.3608.80.23.2.2) Sender: linux-next-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-next@vger.kernel.org > On May 14, 2020, at 8:25 AM, Stephen Rothwell = wrote: >=20 > Hi Paul, >=20 > This patch in the rcu tree >=20 > d13fee049fa8 ("Default enable RCU list lockdep debugging with = PROVE_RCU") >=20 > is causing whack-a-mole in the syzbot testing of linux-next. Because > they always do a debug build of linux-next, no testing is getting = done. :-( >=20 > Can we find another way to find all the bugs that are being discovered > (very slowly)? Alternatively, could syzbot to use PROVE_RCU=3Dn temporarily because it = can=E2=80=99t keep up with it? I personally found PROVE_RCU_LIST=3Dy is = still useful for my linux-next testing, and don=E2=80=99t want to lose = that coverage overnight.=