From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io0-f200.google.com (mail-io0-f200.google.com [209.85.223.200]) by kanga.kvack.org (Postfix) with ESMTP id 55B5B6B027A for ; Sat, 16 Sep 2017 00:12:45 -0400 (EDT) Received: by mail-io0-f200.google.com with SMTP id q7so9114248ioi.3 for ; Fri, 15 Sep 2017 21:12:45 -0700 (PDT) Received: from www262.sakura.ne.jp (www262.sakura.ne.jp. [2001:e42:101:1:202:181:97:72]) by mx.google.com with ESMTPS id i87si2175148ioo.219.2017.09.15.21.12.43 for (version=TLS1 cipher=AES128-SHA bits=128/128); Fri, 15 Sep 2017 21:12:43 -0700 (PDT) Subject: Re: [PATCH] mm,page_alloc: softlockup on warn_alloc on From: Tetsuo Handa References: <20170915095849.9927-1-yuwang668899@gmail.com> <20170915143732.GA8397@cmpxchg.org> In-Reply-To: <20170915143732.GA8397@cmpxchg.org> Message-Id: <201709161312.CAJ73470.FSOHFMVJLFQOOt@I-love.SAKURA.ne.jp> Date: Sat, 16 Sep 2017 13:12:24 +0900 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: owner-linux-mm@kvack.org List-ID: To: hannes@cmpxchg.org Cc: yuwang668899@gmail.com, mhocko@suse.com, linux-mm@kvack.org, chenggang.qcg@alibaba-inc.com, yuwang.yuwang@alibaba-inc.com, akpm@linux-foundation.org Johannes Weiner wrote: > On Fri, Sep 15, 2017 at 05:58:49PM +0800, wang Yu wrote: > > From: "yuwang.yuwang" > > > > I found a softlockup when running some stress testcase in 4.9.x, > > but i think the mainline have the same problem. > > > > call trace: > > [365724.502896] NMI watchdog: BUG: soft lockup - CPU#31 stuck for 22s! > > [jbd2/sda3-8:1164] > > We've started seeing the same thing on 4.11. Tons and tons of > allocation stall warnings followed by the soft lock-ups. Forgot to comment. Since you are able to reproduce the problem (aren't you?), please try setting 1 to /proc/sys/kernel/softlockup_all_cpu_backtrace so that we can know what other CPUs are doing. It does not need to patch kernels. -- 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