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[209.132.180.67]) by mx.google.com with ESMTP id a6si1997811edl.108.2019.10.25.13.01.27; Fri, 25 Oct 2019 13:01:50 -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; dkim=pass header.i=@gmx.net header.s=badeba3b8450 header.b=d7JuN3VW; 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 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2502523AbfJYMAU (ORCPT + 99 others); Fri, 25 Oct 2019 08:00:20 -0400 Received: from mout.gmx.net ([212.227.17.22]:37445 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2393571AbfJYMAU (ORCPT ); Fri, 25 Oct 2019 08:00:20 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1572004802; bh=QLKXtV17sfPFmWYlxFIwH+LjXFG47KnZbF1kx/5IACU=; h=X-UI-Sender-Class:Subject:From:Reply-To:To:Cc:Date:In-Reply-To: References; b=d7JuN3VWX5OlemphcXkYhq7uaMIighoycPKHKdXiWTk5JI4B8v9AXTuDRvo/+sycG xmSUGW6zSglxoXRlL7n+TQEPh6mhvV7/dW5F3zHy9B6EkpNGFXseCOi4IJ5CHzLE+M Zpa/dz9gAerPE8mu6ReMncCR9l93tvl0TDAorZWA= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from bear.fritz.box ([80.128.101.49]) by mail.gmx.com (mrgmx104 [212.227.17.168]) with ESMTPSA (Nemesis) id 1MN5if-1igsYZ2xpF-00J1bu; Fri, 25 Oct 2019 14:00:02 +0200 Message-ID: Subject: Re: mlockall(MCL_CURRENT) blocking infinitely From: Robert Stupp Reply-To: snazy@snazy.de To: Michal Hocko , snazy@snazy.de Cc: Randy Dunlap , linux-kernel@vger.kernel.org, Linux MM , Andrew Morton , "Potyra, Stefan" Date: Fri, 25 Oct 2019 13:59:59 +0200 In-Reply-To: <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> <20191025115038.GF17610@dhcp22.suse.cz> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.34.1-2 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:L2t+JTSwqitjznGbUvYHd13raRoRwOPCm3kUjC2Vlflm80ujit3 wY1czjQ6GvrAu7Bq1SX3fPBsVf3AtTjd021mjCSEZj2mo1rBBXgHlO5qiY43ZbUKCdNmHSL WueQLkLIm+6EUTuxZmnj74oTJ/2SAeOIGqYDHQ6Qoer49jdaPLWk0mjrSODiZv0UoulIWI1 MKDYU/7rSP19+ArJ1/svA== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:caOO7iEICsk=:Z99ZqXlGBXrIGF+94jMRzE McA/2bHBx1Gk6U1swxRMuZFFJLMcaN3mnjZoEM6jnRdhrMBb7gXNhWX/A4cPCz9TwI/jIxmr+ bQeRd0QcTfRQqWtthrFx3rH5Mp477tk0YYZinCLdwSfKhx1bWMPHsHbpOielVSEhX04O14Pt8 zruNAK/H7QxErDSfyizZclVljNJYh3NHCHCzpBLJrsIxTpiCT5n51+R9Yjd50FaKgvRqA9AFF ogNfa0DAZCerjSBs4NKIe/B//y1MVCMCzXk1Nwdsft25tj5VOV28OBf0Gh8+SrH8pZ5XlJ6kP 2DQl7V4st3YUov0UvKcGzN93fcUEon07kAPNlqkvHJ/gCwUc9sV3mUsvf/YR+nZnYy3Ov5IRE fQVcWHQRt/5dbJ5zQAQuZREap4l1QQp3EpT23NLHGLx/DhVC/JwcAxWROuQVHaYGgEAO9fMZn q5YuHzFsDMazzHyAo57fjEIsFOZLkVtEAAUyhI1TEKZjHq/OBIcX9BSTNM41msK66F7M2ElpE PZ6FoStR3vCsW8qW0S9+HdPPyTXRPcNy6lrROw9J+IrhdvFukRCjrSEzW0iCLlkr9X5JQGKDE BPO98yhwNdTQhsxumUFU9fJ6K814+btUj7IPZRK08mFUf54o2rNDK/m1IJapeEj6UpSR0zAx+ eOVzn4vuv3zUpZmOC+vwYM209QE6DISHVb8zJ5b0aIPq2hU1Qz/i8b6FIfmRU87dzFDxn3BDK MiDwkB/AHtxDe+akT/ROj5PQZ6IohBBruv9q4cYvpXV5c9FH0u3I6pApr36WrUUo3j0+8bfrA TUwW3QFalvQFnO5+hvJmIGl2SnJHlZBW+x+DDpE+mCZsMnU5dxE7f3opng/u2EcTU9ePC+ZOw qoWmztI/4DcPyucM7jAfJjVKkvIO8z7/g8kkXiP1vtj92VvlZaMN27YUvl8s5+n64z4MKruKQ UqpMGm6Yxg0TZBuq0fA5jMqbZmwSnrT+VWHEefwUP3So1/yEE7guUCd/46Sa1Tif2BKG8DbDI KcgoSJyOBlxOMKtv8ruvbwvcDPdE1kRqPh5Vnd4M6hrT5/s+EpHwmIkFJXNosZz3odFf+tXaw 9Am7bspInS9T+lbbJlKs6I3uVU5+pJY5WQ8U785EIrr8xim+vQN+AmX6HGpIwVsOyS7Ybzj1b 0arE3d+3PBoU4tZMJZ+iW44NvQLK6E7L1eYy/xGIJbZA1nkDTq8dharjDot/J9j5l2RPQZqPc NCXdBq+YqEeUIsmEepoWj6QT1su1nkBPO5NK9bA== Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2019-10-25 at 13:50 +0200, Michal Hocko wrote: > 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 =3D 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 I suspect, that it's something that's "special" on my machine. But I've got no clue what that might be. Do you think it makes sense to try with all the spectre/meltdown mitigations disabled? Or SMT disabled?