Received: by 2002:a25:d7c1:0:0:0:0:0 with SMTP id o184csp3285ybg; Fri, 25 Oct 2019 15:34:06 -0700 (PDT) X-Google-Smtp-Source: APXvYqzkjl11bkJ7BANyKJ1cduTcxAfd+INRtXHh4/kJlqhenoKhbRQ2lC2iqE1wOgnVbZDG2qj1 X-Received: by 2002:a05:6402:12d5:: with SMTP id k21mr6860450edx.56.1572042846736; Fri, 25 Oct 2019 15:34:06 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1572042846; cv=none; d=google.com; s=arc-20160816; b=NTnf3esK+e+IcICPj/BiVxheJMk39wosUo68AukfTZOlICJT5nZVNRQNZ74U0FmAxZ 7J2TaoeL1yIZ8F2yZae0p0O8G1XJmmd7yntKfTDYbyl6C9h6oD3N3V+DS5LaTBGygMl1 3v3CwbqgaOF0Thpx6+/QdFPwR5++IrDA6tva+PSt4o/kLLBV+XqpDJ9z4Z8pIw5uzOjs mpqzOIztMiv+NuHpLVplJ9qNOokk1FqyyLFCG0588vZ7BEWwcz7bO5ua+eQbeTI9WTQB 8HCxUyXGOEn15dONNJGEXeCqIn55WX7ml0wosICI8hn8Q0um2GbF0y44jUhj2cTaoNvF alyQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-disposition:mime-version:references:message-id:subject:cc :to:from:date; bh=FPTQw6OBycFqWWVQEd10l6C6HljuRUcQFmr3ncJQ7ec=; b=jHkuQNq0StHv4jaAYbuKS4rMkgkqj7TxMyWUObtnxTJS/hTUj31bnzAeJ24iwVfR7l Ba+PYgJRhuR6eIdkuoiML5CnPhhn241rFVW9avtdBsO5e+fsyNwS4Jf1W2imXCvKScFz ppNqHbgzSMbSQbgJXGk/aL8RQ1rzd6M/iRT8LMREwH/tIImFddgimHT3wwC/k/RnYc4H a3T91J4AHrlpYc2QZB2uud6s3MqTwewZ56uyT4hhhGVYBHk7gXUdtyuke/2+f4kMzRpf 1FE8huWIYcRvqIVq71M17ajJGHS5GX2g/cFHQHz5cGtAbPkSgfZcpeYP8KDzBDaHJpeD yFjg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id m9si487188ejo.46.2019.10.25.15.33.43; Fri, 25 Oct 2019 15:34:06 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387881AbfJYLul (ORCPT + 99 others); Fri, 25 Oct 2019 07:50:41 -0400 Received: from mx2.suse.de ([195.135.220.15]:43694 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726463AbfJYLul (ORCPT ); Fri, 25 Oct 2019 07:50:41 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 77D88B49A; Fri, 25 Oct 2019 11:50:39 +0000 (UTC) Date: Fri, 25 Oct 2019 13:50:38 +0200 From: Michal Hocko To: snazy@snazy.de Cc: Randy Dunlap , linux-kernel@vger.kernel.org, Linux MM , Andrew Morton , "Potyra, Stefan" Subject: Re: mlockall(MCL_CURRENT) blocking infinitely Message-ID: <20191025115038.GF17610@dhcp22.suse.cz> References: <4576b336-66e6-e2bb-cd6a-51300ed74ab8@snazy.de> <20191025092143.GE658@dhcp22.suse.cz> <70393308155182714dcb7485fdd6025c1fa59421.camel@gmx.de> <20191025114633.GE17610@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191025114633.GE17610@dhcp22.suse.cz> 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 25-10-19 13:46:33, Michal Hocko wrote: > On Fri 25-10-19 13:02:23, Robert Stupp wrote: > > On Fri, 2019-10-25 at 11:21 +0200, Michal Hocko wrote: > > > On Thu 24-10-19 16:34:46, Randy Dunlap wrote: > > > > [adding linux-mm + people] > > > > > > > > On 10/24/19 12:36 AM, Robert Stupp wrote: > > > > > Hi guys, > > > > > > > > > > I've got an issue with `mlockall(MCL_CURRENT)` after upgrading > > > > > Ubuntu 19.04 to 19.10 - i.e. kernel version change from 5.0.x to > > > > > 5.3.x. > > > > > > > > > > The following simple program hangs forever with one CPU running > > > > > at 100% (kernel): > > > > > > Can you capture everal snapshots of proc/$(pidof $YOURTASK)/stack > > > while > > > this is happening? Btw. I have tested $ cat test_mlockall.c #include #include int main(char** argv) { printf("Before mlockall(MCL_CURRENT|MCL_FUTURE)\n"); // works in 5.0 // hangs forever w/ 5.1 and newer int e = mlockall(MCL_CURRENT|MCL_FUTURE); printf("After mlockall(MCL_CURRENT|MCL_FUTURE) %d\n", e); } $./test_mlockall Before mlockall(MCL_CURRENT|MCL_FUTURE) After mlockall(MCL_CURRENT|MCL_FUTURE) 0 -- Michal Hocko SUSE Labs