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=-2.5 required=3.0 tests=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 D201EC282CA for ; Wed, 13 Feb 2019 13:19:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AD119222B5 for ; Wed, 13 Feb 2019 13:19:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390541AbfBMNTx (ORCPT ); Wed, 13 Feb 2019 08:19:53 -0500 Received: from outbound-smtp25.blacknight.com ([81.17.249.193]:47053 "EHLO outbound-smtp25.blacknight.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388551AbfBMNTw (ORCPT ); Wed, 13 Feb 2019 08:19:52 -0500 Received: from mail.blacknight.com (pemlinmail03.blacknight.ie [81.17.254.16]) by outbound-smtp25.blacknight.com (Postfix) with ESMTPS id 5CC50B891D for ; Wed, 13 Feb 2019 13:19:50 +0000 (GMT) Received: (qmail 17701 invoked from network); 13 Feb 2019 13:19:50 -0000 Received: from unknown (HELO techsingularity.net) (mgorman@techsingularity.net@[37.228.225.79]) by 81.17.254.9 with ESMTPSA (AES256-SHA encrypted, authenticated); 13 Feb 2019 13:19:50 -0000 Date: Wed, 13 Feb 2019 13:19:48 +0000 From: Mel Gorman To: Yury Norov Cc: Vlastimil Babka , Andrea Arcangeli , David Rientjes , Michal Hocko , Zi Yan , Andrew Morton , Linus Torvalds , Will Deacon , Catalin Marinas , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: 5.0-rc kernel hangs on early boot Message-ID: <20190213131948.GR9565@techsingularity.net> References: <20190213082134.GA21834@yury-thinkpad> <20190213111409.GN9565@techsingularity.net> <20190213115115.GA8928@yury-thinkpad> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: <20190213115115.GA8928@yury-thinkpad> 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, Feb 13, 2019 at 02:51:15PM +0300, Yury Norov wrote: > On Wed, Feb 13, 2019 at 11:14:09AM +0000, Mel Gorman wrote: > > On Wed, Feb 13, 2019 at 11:25:40AM +0300, Yury Norov wrote: > > > Hi Mel, all, > > > > > > My kernel on qemu/arm64 setup hangs at early boot since v5.0-rc1. > > > Backtrace is not too verbose: > > > (gdb) i threads > > > Id Target Id Frame > > > * 1 Thread 1 (CPU#0 [running]) 0xffff000010a49b74 in __delay (cycles=4096) > > > at arch/arm64/lib/delay.c:49 > > > 2 Thread 2 (CPU#1 [halted ]) 0x0000000000000000 in ?? () > > > 3 Thread 3 (CPU#2 [halted ]) 0x0000000000000000 in ?? () > > > 4 Thread 4 (CPU#3 [halted ]) 0x0000000000000000 in ?? () > > > (gdb) bt > > > #0 0xffff000010a49b74 in __delay (cycles=4096) at arch/arm64/lib/delay.c:49 > > > Backtrace stopped: previous frame identical to this frame (corrupt stack?) > > > > > > Reverting the patch > > > 1c30844d2dfe272d58c ("mm: reclaim small amounts of memory when an external > > > fragmentation event occurs") together with following patch > > > 73444bc4d8f92e46a20 ("mm, page_alloc: do not wake kswapd with zone lock held") > > > helps me to boot normally. > > > > > > > Well, that's a bad start to any day. Thanks for tracking it down. Does > > the following patch help? I can't test it properly as I didn't recreate > > your boot image or initrd but this appears to get past the initial boot > > phase at least. > > Hi Mel, > > The patch works for me. The day gets better indeed. :-) > > Tested-by: Yury Norov > Thanks! I've resent the patch to Andrew so hopefully it'll be picked up before 5.0 is released. -- Mel Gorman SUSE Labs