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=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 26FA2CA9EA0 for ; Fri, 25 Oct 2019 14:01:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E616320679 for ; Fri, 25 Oct 2019 14:01:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572012114; bh=ZX/hOo1RzJeQ3ctvb+e/ot2mGTssbuGSxRkyobzgtk0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=gZCh/6Y5rOVhu/S4v9IKiQ6YSODmaYNlwLEJPPWkzqhgM+aW2WTmMl6HvxWdsJdMa ejwaDFs5mq6C/6G86gBWLlkTLvRBusIqVY1GNsw5DwbVYPzlr4Lx/0xspmOgqtAFAZ KXfasewehvh7tXojNoweVEEO8P+xZTauicMPRkcg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2505440AbfJYN57 (ORCPT ); Fri, 25 Oct 2019 09:57:59 -0400 Received: from mx2.suse.de ([195.135.220.15]:35768 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2505383AbfJYN5w (ORCPT ); Fri, 25 Oct 2019 09:57:52 -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 5A20DB8B0; Fri, 25 Oct 2019 13:57:50 +0000 (UTC) Date: Fri, 25 Oct 2019 15:57:49 +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: <20191025135749.GK17610@dhcp22.suse.cz> References: <20191025092143.GE658@dhcp22.suse.cz> <70393308155182714dcb7485fdd6025c1fa59421.camel@gmx.de> <20191025114633.GE17610@dhcp22.suse.cz> <20191025120505.GG17610@dhcp22.suse.cz> <20191025121104.GH17610@dhcp22.suse.cz> <20191025132700.GJ17610@dhcp22.suse.cz> <707b72c6dac76c534dcce60830fa300c44f53404.camel@gmx.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <707b72c6dac76c534dcce60830fa300c44f53404.camel@gmx.de> 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 15:45:37, Robert Stupp wrote: > On Fri, 2019-10-25 at 15:27 +0200, Michal Hocko wrote: > > On Fri 25-10-19 15:10:39, Robert Stupp wrote: > > [...] > > > cat /proc/$(pidof test)/smaps > > > > Nothing really unusual that would jump at me except for > > > 7f8be90ed000-7f8be9265000 r-xp 00025000 103:02 > > > 44307431 /lib/x86_64-linux-gnu/libc-2.30.so > > > Size: 1504 kB > > > KernelPageSize: 4 kB > > > MMUPageSize: 4 kB > > > Rss: 832 kB > > > Pss: 5 kB > > > Shared_Clean: 832 kB > > > Shared_Dirty: 0 kB > > > Private_Clean: 0 kB > > > Private_Dirty: 0 kB > > > Referenced: 832 kB > > > Anonymous: 0 kB > > > LazyFree: 0 kB > > > AnonHugePages: 0 kB > > > ShmemPmdMapped: 0 kB > > > Shared_Hugetlb: 0 kB > > > Private_Hugetlb: 0 kB > > > Swap: 0 kB > > > SwapPss: 0 kB > > > Locked: 5 kB > > > > Huh, 5kB, is this really the case or some copy&paste error? > > How can we end up with !pagesize multiple here? Ohh, I haven't noticed pss and didn't realize that Locked is pss like as well. > > > > > THPeligible: 0 > > > VmFlags: rd ex mr mw me lo sd > > mlockall() seems to lock everything though, it just never returns. > > Pretty sure that it's not a copy&paste error. Got a couple more runs > that have an "odd size" - this time with 3kB... > All "Locked" values seem to be okay - except that one. And it's always > odd for the same one (the one with `Size: 1504 kB`). > It's not always odd (3 kB or 5 kB) though - sometimes it says 4 kB. > Seems it's a little breadcrumb? Please try to watch for stack of the syscall and see if there is any pattern. -- Michal Hocko SUSE Labs