Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E7C37C433FE for ; Thu, 2 Dec 2021 22:57:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1349144AbhLBXAr (ORCPT ); Thu, 2 Dec 2021 18:00:47 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39534 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236694AbhLBXAq (ORCPT ); Thu, 2 Dec 2021 18:00:46 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7CD7AC06174A; Thu, 2 Dec 2021 14:57:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.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; bh=jimhSqp4ui/rEJFWw/TifB3e5eXU06bdFyt7nU5nKTE=; b=mwh3+s7+fsAReiSF8tnvnUGhKG ETaJwBnnXSeAic5naongGgL8r+yzXJhA8o3hyG1nXXLRieznY8KYWFc8w8yXbIuWUKW2RZWCF4jC2 Eu23Pct0FY/6OBTWcZabScASYr+SJwpc2hb4LFFMpvBA+FKFpXh19tukcjJj57UnQMXXP3ggCEMCK NnXTLCwXsyaM77D1TF2UuYLnWFmdZYsQM0ZvJAJNToyl6YBoOhq8Ij/AW54DD+ZWSWinwmsdJj7L2 4eKHZ7yCNP06enGlESvgOAnmuZ5AEmqbTR8FxKdRGR7+f4h8tQfvaI2FoB5eEOJyOPSKeDDHxX4gB 1IPVNyQA==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=worktop.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1msv0q-005ygo-Pv; Thu, 02 Dec 2021 22:57:13 +0000 Received: by worktop.programming.kicks-ass.net (Postfix, from userid 1000) id CC23B9810D4; Thu, 2 Dec 2021 23:57:12 +0100 (CET) Date: Thu, 2 Dec 2021 23:57:12 +0100 From: Peter Zijlstra To: Li Zhijian Cc: mingo@redhat.com, will@kernel.org, longman@redhat.com, boqun.feng@gmail.com, open list , "linux-kselftest@vger.kernel.org" , "lkp@lists.01.org" Subject: Re: ww_mutex.sh hangs since v5.16-rc1 Message-ID: <20211202225712.GG16608@worktop.programming.kicks-ass.net> References: <895ef450-4fb3-5d29-a6ad-790657106a5a@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <895ef450-4fb3-5d29-a6ad-790657106a5a@intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Dec 01, 2021 at 09:26:18AM +0800, Li Zhijian wrote: > Hi Folks > > > LKP/0Day found that ww_mutex.sh cannot complete since v5.16-rc1, but > I'm pretty sorry that we failed to bisect the FBC, instead, the bisection pointed > to a/below merge commit(91e1c99e17) finally. > > Due to this hang, other tests in the same group are also blocked in 0Day, we > hope we can fix this hang ASAP. > > So if you have any idea about this, or need more debug information, feel free to let me know :) > > BTW, ww_mutex.sh was failed in v5.15 without hang, and looks it cannot reproduce on a vm. On real hardware: root@ivb-ep:/usr/src/linux-2.6/tools/testing/selftests/locking# uname -a Linux ivb-ep 5.16.0-rc3-00284-g68601c558556 #1 SMP PREEMPT Thu Dec 2 23:03:29 CET 2021 x86_64 GNU/Linux root@ivb-ep:/usr/src/linux-2.6/tools/testing/selftests/locking# ./ww_mutex.sh locking/ww_mutex: ok [ 1907.907801] Beginning ww mutex selftests [ 1915.700077] All ww mutex selftests passed What else do I try?