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=-1.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 2F8B4C10F01 for ; Mon, 18 Feb 2019 15:53:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D6D2E2184A for ; Mon, 18 Feb 2019 15:53:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lca.pw header.i=@lca.pw header.b="DsbETMis" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387926AbfBRPx5 (ORCPT ); Mon, 18 Feb 2019 10:53:57 -0500 Received: from mail-qk1-f193.google.com ([209.85.222.193]:37676 "EHLO mail-qk1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729644AbfBRPx5 (ORCPT ); Mon, 18 Feb 2019 10:53:57 -0500 Received: by mail-qk1-f193.google.com with SMTP id m9so10226153qkl.4 for ; Mon, 18 Feb 2019 07:53:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lca.pw; s=google; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=92e/VznH5XQ4jHrphTiBJuS311THvP1Iy46wzOErUls=; b=DsbETMist337QY5KKYKHkpzezMciT+GLylX1erdZoBCKWX4nvmz61RYdb7Szq86sRq 75GGfxI2YcpFrI+AW7/ebgWdxJKsaF/Rd0NIrBzedSxh/F2at05G45HzaYKPpIZTSICC v9Nw6rOudP5/g0fma1ixw15BHIMXSsCWeIkfP6wXvMwszvQxJby3D6t029qhHMmkFGBK /B8dxtPMcZs2XfBRVjqa6KKPdsbsD8Ey0yyKLlvCjuMnzVINxK6yyX9KBdLIL+MY14Ox Sf8e1eSRKjCo7CJ/UyHL6pFcvMbM9dlAwoCQiS3/0lY9aJKgAw6mfoYgW8CKLkRH6qbJ 0ZMQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=92e/VznH5XQ4jHrphTiBJuS311THvP1Iy46wzOErUls=; b=pOJfNJO1eYZX4BjWvKaYQqdx0L5VKzPdd02WEzWEr8euAH/Cv0fp0U2AjE/i4JAVZ8 JR2p6wMin+ynCOUiyhPStlKAxpiH0nT33d1m88NajgbYjESTt3uVnQAjtrZgFg4ysjuJ ES16JWeKVbneb+f+PcBDdocjjU6SQChCynbscK+puPuUgzgu3Uif1bOYNo8WDXb6ok/D L+ImrkFnmKlruZPyNDi5PbbI4yHH9MyQt9MIvRsYWSAnVrCwvfVB7xGGCKnSAT+AcCpt Gbn/FwBFMFdHZNdquWkm+UbswwaNFeaoIJBlVztZwiB5KOd+w2ou8ugpfSX3km+ASBCm ZsaA== X-Gm-Message-State: AHQUAuapl7Z4SUwWCErTFp0niUQBwIP2UwytCP4tfN7zWERjZs0edpPw zTkgktVtr/s4Q/Fn9nj4pFJ1ENjsnG4= X-Google-Smtp-Source: AHgI3IZLkBNNpsUQecN0Y1ZnuWfF04xr+lqzQJYkbkrq3vrOP3KcGPWjfd7022Qxx+aKpuo93OXLaQ== X-Received: by 2002:a37:9201:: with SMTP id u1mr17606536qkd.258.1550505236132; Mon, 18 Feb 2019 07:53:56 -0800 (PST) Received: from ovpn-120-150.rdu2.redhat.com (pool-71-184-117-43.bstnma.fios.verizon.net. [71.184.117.43]) by smtp.gmail.com with ESMTPSA id 50sm1038107qtr.96.2019.02.18.07.53.54 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 18 Feb 2019 07:53:55 -0800 (PST) Subject: Re: [PATCH] trace: skip hwasan To: Andrey Konovalov Cc: Steven Rostedt , Ingo Molnar , Will Deacon , Catalin Marinas , Andrey Ryabinin , Linux ARM , kasan-dev , LKML References: <20190217043434.46233-1-cai@lca.pw> From: Qian Cai Message-ID: Date: Mon, 18 Feb 2019 10:53:53 -0500 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.3.3 MIME-Version: 1.0 In-Reply-To: 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 2/18/19 10:25 AM, Andrey Konovalov wrote: > On Sun, Feb 17, 2019 at 5:34 AM Qian Cai wrote: >> >> Enabling function tracer with CONFIG_KASAN_SW_TAGS=y (hwasan) tracer >> causes the whole system frozen on ThunderX2 systems with 256 CPUs, >> because there is a burst of too much pointer access, and then KASAN will >> dereference each byte of the shadow address for the tag checking which >> will kill all the CPUs. > > Hi Qian, > > Could you check if adding "CFLAGS_REMOVE_tags.o = -pg" into > mm/kasan/Makefile helps with that? Yes, you nailed it!