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=-8.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_MUTT 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 E9B40C43381 for ; Mon, 18 Feb 2019 10:44:15 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B936F2147A for ; Mon, 18 Feb 2019 10:44:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="NU/kT7Zk" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B936F2147A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Aply80awPPmFeelADW/L8VAYNQO/ybttXLf4r+eRPhg=; b=NU/kT7Zk94dOxD PZJ1UaM0YPcbpPnCrYTUbUjnG0rRJz2DYSs5LlNAUyyWzzvDonbg6hAc8QxiujtBzIVx0ianxK6dL dslwVaz2xXF6aNjNmM2oisooWeo/RZrr16ebmhQGZXaLZ+R8ZtC1P8PInCZcOiW41zH9nunO1lgRx pLekAG/HjcfPPNVvtWNOzn2zwHp/51FhcK8M7BkejWnGLPJXqQt5DkqEOzGVQiROgqsgdEpfev23R i6vBPyoCcWxmG6epBiY2FUMbjn/+6DpDzC40KW+G2wiTr8xA+Ry7zhzlPO9QPDJE0BuvnxSWVp7rc BciBbJpH5BA4M30DnP4Q==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gvgPE-0005Om-Hm; Mon, 18 Feb 2019 10:44:12 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gvgP6-0005Ny-F4 for linux-arm-kernel@lists.infradead.org; Mon, 18 Feb 2019 10:44:10 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 0717C80D; Mon, 18 Feb 2019 02:44:04 -0800 (PST) Received: from fuggles.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 5D2B73F720; Mon, 18 Feb 2019 02:44:02 -0800 (PST) Date: Mon, 18 Feb 2019 10:43:59 +0000 From: Will Deacon To: Qian Cai Subject: Re: [PATCH] trace: skip hwasan Message-ID: <20190218104359.GB10743@fuggles.cambridge.arm.com> References: <20190217043434.46233-1-cai@lca.pw> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190217043434.46233-1-cai@lca.pw> User-Agent: Mutt/1.11.1+86 (6f28e57d73f2) () X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190218_024404_508594_14E2E5D7 X-CRM114-Status: GOOD ( 13.64 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: catalin.marinas@arm.com, linux-kernel@vger.kernel.org, rostedt@goodmis.org, mingo@redhat.com, kasan-dev@googlegroups.com, andreyknvl@google.com, aryabinin@virtuozzo.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Sat, Feb 16, 2019 at 11:34:34PM -0500, 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. > > Signed-off-by: Qian Cai > --- > kernel/trace/Makefile | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile > index c2b2148bb1d2..fdd547a68385 100644 > --- a/kernel/trace/Makefile > +++ b/kernel/trace/Makefile > @@ -28,6 +28,11 @@ ifdef CONFIG_GCOV_PROFILE_FTRACE > GCOV_PROFILE := y > endif > > +# Too much pointer access will kill hwasan. > +ifdef CONFIG_KASAN_SW_TAGS > +KASAN_SANITIZE := n > +endif I don't maintain this file, but I think that my comments on your related patch are relevant here as well: https://lkml.org/lkml/2019/2/18/223 Will _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel