Received: by 2002:ac0:a5a7:0:0:0:0:0 with SMTP id m36-v6csp3958152imm; Mon, 6 Aug 2018 13:49:31 -0700 (PDT) X-Google-Smtp-Source: AAOMgpc6cRt7vd3GBpGoKKMXlX/gKH2zBpMLxdnLrlMMKJA7gXWDibYwXqInDzXoXYMsIzWsXTtP X-Received: by 2002:a62:6547:: with SMTP id z68-v6mr18857171pfb.20.1533588571658; Mon, 06 Aug 2018 13:49:31 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1533588571; cv=none; d=google.com; s=arc-20160816; b=NM15QMJtqKh7pIFNyUXqfq1mRluPLaFm0kkixUz5+0V0l1He4JUfyw+srvRKDzNh7F gomHjiiXvV/B/VkWgPx/ryo/9jriplwKe4OCFM9bHI+W7L8SlC4FIy0ItnHY3bwTjaZe 3h+6khbZIrZaWvEECiR6xiUV2j7ea3JiErijB+476klg9PRUaUFzquPw99fVoO96d7TV K6GeC2USF08Y68cDuxgqifScI2R1NByWjAgujpVqlHQZUTw8DL3nxC8Gsd/sFuFJNQdE 5JawapODK9UWV5dYEau3TVlVFR/ba2sedTN8j+Oz3ovBAweOIWtreyTU4PnTfgMkEXVz 1+Wg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding :content-language:in-reply-to:mime-version:user-agent:date :message-id:from:references:cc:to:subject:arc-authentication-results; bh=Uyw00K9pflgI28uRhaU2L9hbKdNFRkQUHnCXTKbYHjA=; b=vPDZUZ7kyGNlkdSQ0KNz19QTQ2ElcApV23iYuyy4f9JAjKisfirU6xp64+17vQ1d4z x1glXmutCOPwPZWNWY6PwfWHYsVaA5ZkGULwEF0HDHI/4HSQOPwDb/EEMY7qaHWZF6NX Ibojx2tjhR64V6L+ckyoLI66c1ercXQXgQzUiEWZaaegVsKFf5A/VGC9f0WBRXeGnTPa L5ehj8rsftRNwzkn19GUacuTVMnigQehngKCilCLOaUQdoIUZ90h8EcQhu1Xdro1llr5 rcE9jDkLGY5HrW6LhOeXQmHlQYmPrulVnlnaEl+w3lCKushBPjZe+ZyMzEODv1B6pSia XOCQ== 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 Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id s29-v6si15369933pfj.43.2018.08.06.13.49.16; Mon, 06 Aug 2018 13:49:31 -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 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733105AbeHFWhR (ORCPT + 99 others); Mon, 6 Aug 2018 18:37:17 -0400 Received: from www262.sakura.ne.jp ([202.181.97.72]:39842 "EHLO www262.sakura.ne.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728198AbeHFWhR (ORCPT ); Mon, 6 Aug 2018 18:37:17 -0400 Received: from fsav402.sakura.ne.jp (fsav402.sakura.ne.jp [133.242.250.101]) by www262.sakura.ne.jp (8.15.2/8.15.2) with ESMTP id w76KQV8V062166; Tue, 7 Aug 2018 05:26:31 +0900 (JST) (envelope-from penguin-kernel@i-love.sakura.ne.jp) Received: from www262.sakura.ne.jp (202.181.97.72) by fsav402.sakura.ne.jp (F-Secure/fsigk_smtp/530/fsav402.sakura.ne.jp); Tue, 07 Aug 2018 05:26:31 +0900 (JST) X-Virus-Status: clean(F-Secure/fsigk_smtp/530/fsav402.sakura.ne.jp) Received: from [192.168.1.8] (softbank126074194044.bbtec.net [126.74.194.44]) (authenticated bits=0) by www262.sakura.ne.jp (8.15.2/8.15.2) with ESMTPSA id w76KQQmu062141 (version=TLSv1.2 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Tue, 7 Aug 2018 05:26:31 +0900 (JST) (envelope-from penguin-kernel@i-love.sakura.ne.jp) Subject: Re: WARNING in try_charge To: Michal Hocko , syzbot Cc: cgroups@vger.kernel.org, dvyukov@google.com, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, vdavydov.dev@gmail.com References: <0000000000006350880572c61e62@google.com> <20180806174410.GB10003@dhcp22.suse.cz> <20180806175627.GC10003@dhcp22.suse.cz> From: Tetsuo Handa Message-ID: <078bde8d-b1b5-f5ad-ed23-0cd94b579f9e@i-love.sakura.ne.jp> Date: Tue, 7 Aug 2018 05:26:23 +0900 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20180806175627.GC10003@dhcp22.suse.cz> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2018/08/07 2:56, Michal Hocko wrote: > So the oom victim indeed passed the above force path after the oom > invocation. But later on hit the page fault path and that behaved > differently and for some reason the force path hasn't triggered. I am > wondering how could we hit the page fault path in the first place. The > task is already killed! So what the hell is going on here. > > I must be missing something obvious here. > YOU ARE OBVIOUSLY MISSING MY MAIL! I already said this is "mm, oom: task_will_free_mem(current) should ignore MMF_OOM_SKIP for once." problem which you are refusing at https://www.spinics.net/lists/linux-mm/msg133774.html . And you again ignored my mail. Very sad...