From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from wp530.webpack.hosteurope.de (wp530.webpack.hosteurope.de [80.237.130.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 268C063A9; Wed, 17 Apr 2024 05:48:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=80.237.130.52 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713332918; cv=none; b=WdwXpLignKd2EsUd0/6EejPDNUWYxE7XlLo/QXpvGecE0cBdXUAQL/3d5r0mFfSUo27brj5C5lilXMnXmFfIWN6+h+xhrRK/CU3eHATpITlR0T4ZBdR67Zx0K5ox92RWuZv9SuH0DOOPKDjjrVCVUJe3CgsFZJEvQAzB/YRqJmw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713332918; c=relaxed/simple; bh=Sm9q0EOoXp0q6ICHLJOVlGc/O9eyBrB7YL1yaQfmswM=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=U8RX/jxeS69UTvUSuKKV2sG6OgtzCxXs9vy2o7RBOA+RqVXJiEsemYVrf6v5tQ3wy6rK2FVOjV91VU/tgaT5nEbU2ueDGspzMRRXaw0E5jpzqMz4LDBvMs0pnO47EisBjDqSR8QOOx2dqy65syUSZVlFelBu0RPon+vGX9aQWZM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=leemhuis.info; spf=pass smtp.mailfrom=leemhuis.info; dkim=pass (2048-bit key) header.d=leemhuis.info header.i=@leemhuis.info header.b=dF9BqFas; arc=none smtp.client-ip=80.237.130.52 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=leemhuis.info Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=leemhuis.info Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=leemhuis.info header.i=@leemhuis.info header.b="dF9BqFas" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=leemhuis.info; s=he214686; h=Content-Transfer-Encoding:Content-Type: In-Reply-To:Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:From:Sender:Reply-To:Subject:Date:Message-ID:To:Cc:MIME-Version: Content-Type:Content-Transfer-Encoding:Content-ID:Content-Description: In-Reply-To:References; bh=VEpepBBKD5Nnnsgtm3zVY7Py62POG/xkrWi/8rs2xJM=; t=1713332916; x=1713764916; b=dF9BqFaswUMqYadA3DXzz3sDg9591+fXdvsvCYOFMB9BOd/ 3VTewGU0rBbbAWiFNvP9agidVg57Rx0RJyw2QhZKEavB5SwVdagtvgJzDZ6RjMaZtJ8c6D/cPzDN+ cfZe7vDOEy/rM6flRzeUJHwW43M5Y8prE8GR8SPpzsGgBiK9d1acMtAFh5XWk+CqrJaI1rZKIiRA6 geMlPEZ9q6Ox64asZo0z2CKcpbgvptDdZw7ytGYbNVxqDz5afWUHSswVWJjTVBXpI5o5kbnk27Kz/ BDDdjGRG1yrvG4hVTl0ZEtYFP0RarBeI0z4HFjQDXuVXI7+ktCZt8X7wyfLSNd6Q==; Received: from [2a02:8108:8980:2478:8cde:aa2c:f324:937e]; authenticated by wp530.webpack.hosteurope.de running ExIM with esmtpsa (TLS1.3:ECDHE_RSA_AES_128_GCM_SHA256:128) id 1rwy9p-0005nB-Jt; Wed, 17 Apr 2024 07:48:33 +0200 Message-ID: <51942e58-a5a3-4dcd-80c1-6735c7b5cc1e@leemhuis.info> Date: Wed, 17 Apr 2024 07:48:33 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Bug 218665 - nohz_full=0 prevents kernel from booting To: Tejun Heo , Bjorn Andersson Cc: LKML , Linux regressions mailing list References: <5be248c6-cdda-4d2e-8fae-30fc2cc124c0@leemhuis.info> <28c84b3b-f68f-4f45-8da1-9c3f9a342509@leemhuis.info> <7kugx5ivbplwwrcq5zp37djtpakl55b3pfy36gpbsbcx43dpcs@uheu6iv7gm7h> <81149f18-0132-4ace-8c71-1b75790a88e4@leemhuis.info> From: "Linux regression tracking (Thorsten Leemhuis)" Content-Language: en-US, de-DE Reply-To: Linux regressions mailing list In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-bounce-key: webpack.hosteurope.de;regressions@leemhuis.info;1713332916;8ec4cf79; X-HE-SMSGID: 1rwy9p-0005nB-Jt On 17.04.24 01:21, Tejun Heo wrote: > On Tue, Apr 16, 2024 at 08:08:07AM +0200, Linux regression tracking (Thorsten Leemhuis) wrote: >> On 12.04.24 04:57, Bjorn Andersson wrote: >>> On Wed, Apr 10, 2024 at 11:18:04AM +0200, Linux regression tracking (Thorsten Leemhuis) wrote: >>>> On 08.04.24 00:52, Bjorn Andersson wrote: >>>>> On Tue, Apr 02, 2024 at 10:17:16AM +0200, Linux regression tracking (Thorsten Leemhuis) wrote: >>>>>> >>>>>> Tejun, apparently it's cause by a change of yours. >>>>>> Quoting from https://bugzilla.kernel.org/show_bug.cgi?id=218665 : >>>>>> >>>>>>> booting the current kernel (6.9.0-rc1, master/712e1425) on x86_64 >>>>>>> with nohz_full=0 cause a page fault and prevents the kernel from >>>>>>> booting. >>>>> [...] >> >> Tejun, I got a bit lost here. Can you help me out please? >> >> I'm currently assuming that these two reports have the same cause: >> https://lore.kernel.org/all/20240402105847.GA24832@redhat.com/T/#u >> https://bugzilla.kernel.org/show_bug.cgi?id=218665 >> >> And that both will be fixed by this patch from Oleg Nesterov: >> https://lore.kernel.org/lkml/20240411143905.GA19288@redhat.com/ >> >> But well, to me it looks like below issue from Bjorn is different, even >> if it is caused by the same change -- nevertheless it looks like nobody >> has looked into this since it was reported about two weeks ago. Or was >> progress made and I just missed it? > > Can you elaborate why Bjorn's case is different? Well "not booting at all when using 'nohz_full=0'"[as reported two times] and "I start neovim, send SIGSTOP (i.e. ^Z) to it, start another neovim instance and upon sending SIGSTOP to that instance all of userspace locks up - 100% reproducible."[while no 'nohz_full=0' in use] at least on the first sight to and outsider sound a lot like different problems to me -- but of course that impression might be wrong and you know better about these things. > I was assuming it was the > same problem and that Oleg's fixes would address the issue. Bjorn, could you give it a try? Ciao, Thorsten