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=-2.3 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=ham 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 273ECC43381 for ; Mon, 18 Mar 2019 11:57:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DB7DE2084F for ; Mon, 18 Mar 2019 11:57:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="K4xDAq9i" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727193AbfCRL5c (ORCPT ); Mon, 18 Mar 2019 07:57:32 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:33178 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726897AbfCRL5c (ORCPT ); Mon, 18 Mar 2019 07:57:32 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Transfer-Encoding :Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date: Sender:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=JAz+Eu34UwsmzIzg1ee3czANBIDalcEvehwlmxNHZZ4=; b=K4xDAq9i1XlK0BR03pv2D4au+F fC1v6Ffc9q1M4k9lN2Fgc7gr19Gk5Mmi6/t0Tj0GZNZKA1MUz3s5a+ay1Rpz6PH9PL7VSp8Ft2Nda DJobNWPhrwalFpJvlUyVpR/OLwYBQnViwvu6KJUUVwrBcLX15jDUw7a7ekzSFJFgg2wnRWkR2i+Op 6yKGHzsRZTMEvyqA2i/7Na0dGRmWjSCDs/srHyyVGo8I2ISA66Ez49jmZXN8btA1U46qKFafaTYt/ 9KBcKwVQ5llWVbyVrPQBTR82sFe0VyjUTc9Al0s/XgQZgTWby3LCVAwPopk7r10vnA19by8ChjSGn 4Le3Ga9w==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1h5qtX-0008Ka-IP; Mon, 18 Mar 2019 11:57:31 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id DD84F202194F4; Mon, 18 Mar 2019 12:57:28 +0100 (CET) Date: Mon, 18 Mar 2019 12:57:28 +0100 From: Peter Zijlstra To: Thomas =?iso-8859-1?Q?M=FCller?= Cc: linux-kernel@vger.kernel.org Subject: Re: disabling secondary CPU hangs / system fails to suspend with kernel 4.19+ Message-ID: <20190318115728.GP6058@hirez.programming.kicks-ass.net> References: <5c48095e-028a-404f-aaa1-964f83c83817@mathtm.de> <20190315090950.GT5996@hirez.programming.kicks-ass.net> <20190315121541.GD6058@hirez.programming.kicks-ass.net> <2b1c85d3-d94b-1593-e30a-a32d97043579@mathtm.de> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <2b1c85d3-d94b-1593-e30a-a32d97043579@mathtm.de> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Mar 15, 2019 at 09:21:02PM +0100, Thomas Müller wrote: > I've just re-tested with runlevel 3. > Not a real VGA console, but at least no Wayland or Gnome to interfere... > > `echo 0 > /sys/...` just blocks and no message whatsoever is visible in dmesg. > > I've executed `echo 0 > ...` in the background to keep my console functional and I can e.g. echo > something to /dev/kmsg and it shows up, so reading/updating the log buffer appears to be working > just fine. Damn.. Thanks for trying. I'll see if I can come up with something, but I'm out of idea for now :/