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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2CD0CC4167B for ; Wed, 30 Nov 2022 00:34:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229741AbiK3AeN (ORCPT ); Tue, 29 Nov 2022 19:34:13 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44172 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229512AbiK3AeM (ORCPT ); Tue, 29 Nov 2022 19:34:12 -0500 Received: from smtp-fw-80007.amazon.com (smtp-fw-80007.amazon.com [99.78.197.218]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 03BC827925; Tue, 29 Nov 2022 16:34:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1669768453; x=1701304453; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=SdWegCh9WoUemvDgOqiphOFPN3rRgc2laV4ucMMVz1Q=; b=gGvES0l1QwmQM3g/KBVXaWHJy6TM7cQ8VAOVbps02UQOal3x9h89qDHQ D+h6JvbFqW/KcMiiKvn0YnFJ3Pu9REclLSyx8CYEu9I8Dm19IPs9VCnG9 WxJLLId1hkD9z4gDecwC8G0Xo2xt+9jch7iRcTtGL0yn+i8/NQ3+vDId0 w=; X-IronPort-AV: E=Sophos;i="5.96,204,1665446400"; d="scan'208";a="156184454" Received: from pdx4-co-svc-p1-lb2-vlan3.amazon.com (HELO email-inbound-relay-iad-1e-m6i4x-b538c141.us-east-1.amazon.com) ([10.25.36.214]) by smtp-border-fw-80007.pdx80.corp.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Nov 2022 00:34:11 +0000 Received: from EX13MTAUWC002.ant.amazon.com (iad12-ws-svc-p26-lb9-vlan2.iad.amazon.com [10.40.163.34]) by email-inbound-relay-iad-1e-m6i4x-b538c141.us-east-1.amazon.com (Postfix) with ESMTPS id 10B13A2E16; Wed, 30 Nov 2022 00:34:05 +0000 (UTC) Received: from EX19D001UWA002.ant.amazon.com (10.13.138.236) by EX13MTAUWC002.ant.amazon.com (10.43.162.240) with Microsoft SMTP Server (TLS) id 15.0.1497.42; Wed, 30 Nov 2022 00:34:05 +0000 Received: from localhost (10.43.160.223) by EX19D001UWA002.ant.amazon.com (10.13.138.236) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1118.20; Wed, 30 Nov 2022 00:34:04 +0000 Date: Tue, 29 Nov 2022 16:34:02 -0800 From: Samuel Mendoza-Jonas To: Greg KH CC: Shakeel Butt , Michele Jr De Candia , , , , , , , , , , , , , , Subject: Re: [PATCH 5.4 051/389] epoll: autoremove wakers even more aggressively Message-ID: <20221130003402.hu3l4hehge5xqgen@u46989501580c5c.ant.amazon.com> References: <20220823080117.738248512@linuxfoundation.org> <20221026160051.5340-1-mdecandia@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: X-Originating-IP: [10.43.160.223] X-ClientProxiedBy: EX13D32UWB002.ant.amazon.com (10.43.161.139) To EX19D001UWA002.ant.amazon.com (10.13.138.236) Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org On Thu, Oct 27, 2022 at 12:09:30PM +0200, Greg KH wrote: > On Wed, Oct 26, 2022 at 11:48:01AM -0700, Shakeel Butt wrote: > > On Wed, Oct 26, 2022 at 11:44 AM Michele Jr De Candia > > wrote: > > > > > > Hi Greg, > > > sorry for the confusion. > > > > > > I'm running a container-based app on top of Ubuntu Linux 20.04 and linux kernel 5.4 always updated with latest patches. > > > > > > Updating from 5.4.210 to 5.4.211 we faced the hang up issue and searching for the cause we have tested that > > > hangup occurs only with this patch > > > > > > https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.4.y&id=cf2db24ec4b8e9d399005ececd6f6336916ab6fc > > > > > > While understanding root cause, wt the moment we reverted it and hang up does not occurs (actually we are running 5.4.219 without that patch). > > > > > > Michele > > > > > > > Hi Michele, can you try the latest upstream kernel and see if the > > issue repro ther? Also is it possible to provide a simplified repro of > > the issue? > > Also is this issue on 5.10.y and 5.15.y? > > thanks, > > greg k-h Following up this email thread for those of us who were watching it; it looks like this was only an issue on 5.4.y due to some missing backports that this change depended on - see this thread for details: https://lore.kernel.org/lkml/Y38h9oe4ZEGNd7Zx@quatroqueijos.cascardo.eti.br/T/ Cheers, Sam