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=-2.1 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 9E0ADC0044C for ; Wed, 31 Oct 2018 17:40:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 642E520657 for ; Wed, 31 Oct 2018 17:40:03 +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="b4e32TDz" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 642E520657 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729958AbeKACjA (ORCPT ); Wed, 31 Oct 2018 22:39:00 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:45462 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729745AbeKACjA (ORCPT ); Wed, 31 Oct 2018 22:39:00 -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-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding: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=pjq19D//p3UoJ5RYfbIbxvjAymoVDf4guMv3jU5GGu8=; b=b4e32TDzDOn66t3O2PtXXI03C 6N5yJrLkvu34blE6hUgDwSABp945Y3rw/xuqVkTfLoTx7vo9vPg46E+/y2ekMr3DNyGNjmnWPOR2G MLjToWWj6xW2hJehUwJsYbhZdpAk88ZsLIMm8G25DWTzE636R/Jy4k+9UtzWglOJUookRD8nFASqM DrOlQqYXIvqCI2458kx70156SkOjk+GLU+BuOoN2Kj0EP5Hsth2ETC+b9cjcU/l1TfDcu8ECzHcC2 HweJhae7OSg+KrRO1XCr7PTKR54L86sEqJbQEOQHOxLSB+R6q2VxCYy41K28OlZXNbM98PRO0tQwL /7VzEOgkw==; 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 1gHuT8-0005tW-ED; Wed, 31 Oct 2018 17:39:50 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id CC8692029F87F; Wed, 31 Oct 2018 18:39:47 +0100 (CET) Date: Wed, 31 Oct 2018 18:39:47 +0100 From: Peter Zijlstra To: Juri Lelli Cc: Daniel Bristot de Oliveira , luca abeni , Thomas Gleixner , Juri Lelli , syzbot , Borislav Petkov , "H. Peter Anvin" , LKML , mingo@redhat.com, nstange@suse.de, syzkaller-bugs@googlegroups.com, henrik@austad.us, Tommaso Cucinotta , Claudio Scordino Subject: Re: INFO: rcu detected stall in do_idle Message-ID: <20181031173947.GE13219@hirez.programming.kicks-ass.net> References: <20181018122331.50ed3212@luca64> <20181018104713.GC21611@localhost.localdomain> <20181018130811.61337932@luca64> <20181019113942.GH3121@hirez.programming.kicks-ass.net> <20181019225005.61707c64@nowhere> <20181024120335.GE29272@localhost.localdomain> <20181030104554.GB8177@hirez.programming.kicks-ass.net> <20181030120804.2f30c2da@sweethome> <2942706f-db18-6d38-02f7-ef21205173ca@redhat.com> <20181031164009.GM18091@localhost.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181031164009.GM18091@localhost.localdomain> 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 Wed, Oct 31, 2018 at 05:40:10PM +0100, Juri Lelli wrote: > I'm seeing something along the lines of what Peter suggested as a last > resort measure we probably still need to put in place. Yes, you certainly hope to never hit that, and should not in a proper setup. But we need something to keep things 'working'.