From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf0-f70.google.com (mail-lf0-f70.google.com [209.85.215.70]) by kanga.kvack.org (Postfix) with ESMTP id DBC776B0005 for ; Sat, 25 Jun 2016 13:29:56 -0400 (EDT) Received: by mail-lf0-f70.google.com with SMTP id g18so96101899lfg.2 for ; Sat, 25 Jun 2016 10:29:56 -0700 (PDT) Received: from mail.sig21.net (mail.sig21.net. [80.244.240.74]) by mx.google.com with ESMTPS id w123si2859872wmd.120.2016.06.25.10.29.55 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 25 Jun 2016 10:29:55 -0700 (PDT) Date: Sat, 25 Jun 2016 19:29:51 +0200 From: Johannes Stezenbach Subject: Re: 4.6.2 frequent crashes under memory + IO pressure Message-ID: <20160625172951.GA5586@sig21.net> References: <20160616212641.GA3308@sig21.net> <20160623091830.GA32535@sig21.net> <201606232026.GFJ26539.QVtFFOJOOLHFMS@I-love.SAKURA.ne.jp> <20160625155006.GA4166@sig21.net> <201606260204.BDB48978.FSFFJQHOMLVOtO@I-love.SAKURA.ne.jp> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <201606260204.BDB48978.FSFFJQHOMLVOtO@I-love.SAKURA.ne.jp> Sender: owner-linux-mm@kvack.org List-ID: To: Tetsuo Handa Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, mhocko@kernel.org On Sun, Jun 26, 2016 at 02:04:40AM +0900, Tetsuo Handa wrote: > It seems to me that somebody is using ALLOC_NO_WATERMARKS (with possibly > __GFP_NOWARN), but I don't know how to identify such callers. Maybe print > backtrace from __alloc_pages_slowpath() when ALLOC_NO_WATERMARKS is used? Wouldn't this create too much output for slow serial console? Or is this case supposed to be triggered rarely? This crash testing is pretty painful but I can try it tomorrow if there is no better idea. Johannes -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org