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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DFA7BC433FE for ; Thu, 13 Oct 2022 05:22:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229665AbiJMFWW (ORCPT ); Thu, 13 Oct 2022 01:22:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47490 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229591AbiJMFWU (ORCPT ); Thu, 13 Oct 2022 01:22:20 -0400 Received: from mail-pl1-x62b.google.com (mail-pl1-x62b.google.com [IPv6:2607:f8b0:4864:20::62b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 62563C7079 for ; Wed, 12 Oct 2022 22:22:19 -0700 (PDT) Received: by mail-pl1-x62b.google.com with SMTP id l4so846080plb.8 for ; Wed, 12 Oct 2022 22:22:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=in-reply-to:references:subject:cc:to:from:message-id:date :content-transfer-encoding:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=5KUigR7SJ7uFyr2yNbxpVBZqM/PTPgSSjnaooqgXQb4=; b=mDoghLF0CDSCPU4++bngkMIB3aPLTW4HOAtQe7zp1ltS3uBufcMoVWGDWMQyreLZCU yRFG6g2e1dv8StaRvGI1qiKcrVTtrdTgcObGTzaOyaRQdVRCmjZmXJA8P3jC/CbzchDb ch7WseAve+DRjfS54Oh1FMXR3TZtPI/r+xMlZqk5CPCEObseWIVTOL4MJgjGposWh41z xkmywKUlppn7VdLluqfkeGMXA3picuSrIEgPWd39GfFSPlAN+zF3m/IJpWBk6/Vnv4u9 wsRZ4opeub7nggQVoOG3g6g7MiWnrORIzTEyL6E+iQESVjoKJxN2xvEX+Vb4SZuwXvZv z74Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:references:subject:cc:to:from:message-id:date :content-transfer-encoding:mime-version:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to; bh=5KUigR7SJ7uFyr2yNbxpVBZqM/PTPgSSjnaooqgXQb4=; b=BcNRHbFkAd2zUeC4/dN5K9oC3gsgp+VirVBXkyASEFnurQzBmN2bDGhfh8g4An5oCd GaPafK48oCT5m+daetrwPYeijNjkqDxEOG5i1KCRi5eBwSUWXe4u4a+1G46jO8ehmNoJ O9oq2iRvQ3PL3vkzWPpwXp2hr4FQZjsoDMfeRomzH1Jlx+nnonXluBkkY/4hJm5DrGlG 8h6fk9P9WhPNHcX6nuWjFuu2PL+uLPnm0c9t2v/RiUt60Oy8aP7UHM6SjpGTF12zcxSw xZqHUchRQJCbUlczqo+B0KFw7GXjyCdvFS5PTi08zAE5I3pR5w14XxwfTu+rVM5L16Sl JyXg== X-Gm-Message-State: ACrzQf3JJfXDSx5oYXkkyOQzh4M2G5Orr2v+VpfxWr2shIWXUs050khN oXGrcAR8dIzZfvRj8hGSd6psYDBiWyCdOg== X-Google-Smtp-Source: AMsMyM4IE0OtdgMomYoWq+tu6m77qqVcqsJKqjqKRhI/OJqvgva+src7nCKPmMXCXbDUsqYT+YODkQ== X-Received: by 2002:a17:902:e982:b0:17f:ca1f:aa44 with SMTP id f2-20020a170902e98200b0017fca1faa44mr32495020plb.76.1665638538944; Wed, 12 Oct 2022 22:22:18 -0700 (PDT) Received: from localhost ([202.173.165.98]) by smtp.gmail.com with ESMTPSA id h185-20020a62dec2000000b00561c6a4c1b0sm847441pfg.176.2022.10.12.22.22.07 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 12 Oct 2022 22:22:18 -0700 (PDT) Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Thu, 13 Oct 2022 15:22:05 +1000 Message-Id: From: "Nicholas Piggin" To: "Guenter Roeck" , "Michael Ellerman" Cc: "Jason A. Donenfeld" , "Linus Torvalds" , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: Re: [GIT PULL] Please pull powerpc/linux.git powerpc-6.1-1 tag X-Mailer: aerc 0.11.0 References: <87edvhntv0.fsf@mpe.ellerman.id.au> <20221012141827.GA2405914@roeck-us.net> <20221012164452.GA2990467@roeck-us.net> <20221012221615.GA364143@roeck-us.net> <87bkqgmvxl.fsf@mpe.ellerman.id.au> <20221013002148.GA535574@roeck-us.net> In-Reply-To: <20221013002148.GA535574@roeck-us.net> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu Oct 13, 2022 at 10:21 AM AEST, Guenter Roeck wrote: > On Thu, Oct 13, 2022 at 11:03:34AM +1100, Michael Ellerman wrote: > > Guenter Roeck writes: > > > On Wed, Oct 12, 2022 at 11:20:38AM -0600, Jason A. Donenfeld wrote: > > >>=20 > > >> I've also managed to not hit this bug a few times. When it triggers, > > >> after "kprobes: kprobe jump-optimization is enabled. All kprobes are > > >> optimized if possible.", there's a long hang - tens seconds before i= t > > >> continues. When it doesn't trigger, there's no hang at that point in= the > > >> boot process. > > >>=20 > > > > > > I managed to bisect the problem. See below for results. Reverting the > > > offending patch fixes the problem for me. > >=20 > > Thanks. > >=20 > > This is probably down to me/us not testing with PREEMPT enabled enough. > >=20 > Not sure. My configuration has > > CONFIG_PREEMPT_NONE=3Dy > # CONFIG_PREEMPT_VOLUNTARY is not set > # CONFIG_PREEMPT is not set Okay I reproduced it, just takes a while to hit. Thanks, Nick