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=-3.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,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 71B9BC432BE for ; Mon, 30 Aug 2021 20:12:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 537A660F5C for ; Mon, 30 Aug 2021 20:12:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234871AbhH3UNX (ORCPT ); Mon, 30 Aug 2021 16:13:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44164 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231499AbhH3UNW (ORCPT ); Mon, 30 Aug 2021 16:13:22 -0400 Received: from mail-oi1-x22b.google.com (mail-oi1-x22b.google.com [IPv6:2607:f8b0:4864:20::22b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 89D55C061575 for ; Mon, 30 Aug 2021 13:12:28 -0700 (PDT) Received: by mail-oi1-x22b.google.com with SMTP id 6so21444819oiy.8 for ; Mon, 30 Aug 2021 13:12:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=IcITDjfopAEQf0wLc/UpVTpvTktp1wXpBtTzyWZoS5s=; b=cEpEq4oyVznvXppjI6rMzGq1P2FzCNkIHl41EDWrq8M/JjL+PzEv1zKF4SPp/cKZya SxnjLH9zf5PRWq3revgF30YFMaeXK19Uh2h0YhiCu1z7MQKQH2iBpWEsGyHpCGOI0By+ N0Izo6fm17S5VEa4vncA0s10+yBp7LV2hXqDIRvERJ0OX+/RrPYdfDaL1t1xhw8r0oop XqUUedO1NzhaZrkiRP3vJ0oGj/C5vr7bE+gv78mofFnf+yXTzJ03djuFs9hEfKVmAbMx 7/ZNdmetbg0vCYwf8GBegJFXqa6u4YsydwFjmbBiLxmTCss0qWlDfH3Q7oAgkO2AJWVF iBnA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :references:mime-version:content-disposition:in-reply-to; bh=IcITDjfopAEQf0wLc/UpVTpvTktp1wXpBtTzyWZoS5s=; b=gA+2pb3rExD3imdu7VbaQRGCJVTqeJsS/kD4J4DlNpyscTuhiM0uLzGn87tLpRrvBB WjsBhOEiAdT8+fo/3Qq/YslixYWk3Rko483D6WUWTjgvC9nTFScmIRA7b3rzzKFMi5N6 n7988gMNcNVHPPfybILsfAqWmQPJoiHDq7iXOqRKbljX4JrnjWjOB9eebAP8dMRWX4e8 7hZEy1mjRj7xHp7zwOjQi9BCBKHnUHsPuC+eWg54+0Kmnx6qLbwtSPh35QwpNX3LWrGl FTvLgfNXTuRo3pqgB312lsUqVc6fMu1TjO3WVpo8lyA5+7YHpnMBh/KJOVBZAxy7c5kL 5nlA== X-Gm-Message-State: AOAM533oLxArMTJU2kj5cLoTouUj0HtL1qNyD5vEdUEH84E/ZuyGhQAn Z9XqdlP2HLzRVdrV7hOyess= X-Google-Smtp-Source: ABdhPJxckCyjY+JT63yl/sqmtG6D+QKPu09FGfEXgcYt6SY6LVuRwTbI9oDXn1qz4SSrhJ/iTL5VQw== X-Received: by 2002:a05:6808:f90:: with SMTP id o16mr683915oiw.37.1630354347893; Mon, 30 Aug 2021 13:12:27 -0700 (PDT) Received: from server.roeck-us.net ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id f17sm3425097otl.24.2021.08.30.13.12.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Aug 2021 13:12:27 -0700 (PDT) Sender: Guenter Roeck Date: Mon, 30 Aug 2021 13:12:25 -0700 From: Guenter Roeck To: Linus Torvalds Cc: Linux Kernel Mailing List , Peter Zijlstra Subject: Re: Linux 5.14 Message-ID: <20210830201225.GA2671970@roeck-us.net> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Aug 29, 2021 at 03:19:23PM -0700, Linus Torvalds wrote: > So I realize you must all still be busy with all the galas and fancy > balls and all the other 30th anniversary events, but at some point you > must be getting tired of the constant glitz, the fireworks, and the > champagne. That ball gown or tailcoat isn't the most comfortable > thing, either. The celebrations will go on for a few more weeks yet, > but you all may just need a breather from them. > > And when that happens, I have just the thing for you - a new kernel > release to test and enjoy. Because 5.14 is out there, just waiting for > you to kick the tires and remind yourself what all the festivities are > about. > > Of course, the poor tireless kernel maintainers won't have time for > the festivities, because for them, this just means that the merge > window will start tomorrow. We have another 30 years to look forward > to, after all. But for the rest of you, take a breather, build a > kernel, test it out, and then you can go back to the seemingly endless > party that I'm sure you just crawled out of. > Build results: total: 154 pass: 154 fail: 0 Qemu test results: total: 479 pass: 479 fail: 0 So far so good, but there is a brand new runtime warning, seen when booting s390 images. [ 3.218816] ------------[ cut here ]------------ [ 3.219010] WARNING: CPU: 1 PID: 0 at kernel/sched/core.c:5779 sched_core_cpu_starting+0x172/0x180 [ 3.219548] Modules linked in: [ 3.219948] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.14.0 #1 [ 3.220139] Hardware name: QEMU 2964 QEMU (KVM/Linux) [ 3.220312] Krnl PSW : 0400e00180000000 0000000000186e86 (sched_core_cpu_starting+0x176/0x180) [ 3.220593] R:0 T:1 IO:0 EX:0 Key:0 M:0 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3 [ 3.220746] Krnl GPRS: 0000000000000000 0000000000000200 0000000000000200 0000000000000200 [ 3.220821] ffffffffffffffff 0000000000000000 000000000161f300 0000000001209c30 [ 3.220893] 0000000000000002 00000000019bf418 0000000000000001 000000001fbf2300 [ 3.220964] 0000000000000000 0000000000000001 0000000000186dc4 0000038000093c90 [ 3.222032] Krnl Code: 0000000000186e7a: af000000 mc 0,0 [ 3.222032] 0000000000186e7e: a7f4ff88 brc 15,0000000000186d8e [ 3.222032] #0000000000186e82: af000000 mc 0,0 [ 3.222032] >0000000000186e86: a7f4ffe7 brc 15,0000000000186e54 [ 3.222032] 0000000000186e8a: 0707 bcr 0,%r7 [ 3.222032] 0000000000186e8c: 0707 bcr 0,%r7 [ 3.222032] 0000000000186e8e: 0707 bcr 0,%r7 [ 3.222032] 0000000000186e90: c00400000000 brcl 0,0000000000186e90 [ 3.222845] Call Trace: [ 3.222992] [<0000000000186e86>] sched_core_cpu_starting+0x176/0x180 [ 3.223114] ([<0000000000186dc4>] sched_core_cpu_starting+0xb4/0x180) [ 3.223182] [<00000000001963e4>] sched_cpu_starting+0x2c/0x68 [ 3.223243] [<000000000014f288>] cpuhp_invoke_callback+0x318/0x970 [ 3.223304] [<000000000014f970>] cpuhp_invoke_callback_range+0x90/0x108 [ 3.223364] [<000000000015123c>] notify_cpu_starting+0x84/0xa8 [ 3.223426] [<0000000000117bca>] smp_init_secondary+0x72/0xf0 [ 3.223492] [<0000000000117846>] smp_start_secondary+0x86/0x90 [ 3.223614] no locks held by swapper/1/0. [ 3.223713] Last Breaking-Event-Address: [ 3.223762] [<0000000000000000>] 0x0 [ 3.224578] random: get_random_bytes called from __warn+0x11e/0x158 with crng_init=0 [ 3.234056] ---[ end trace 5ffbc0f4ab37cea9 ]--- Commit 3c474b3239f12 ("sched: Fix Core-wide rq->lock for uninitialized CPUs") sems to be the culprit. Indeed, the warning is gone after reverting this commit. Guenter