From patchwork Fri Mar 10 09:08:01 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 9615503 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 829F360417 for ; Fri, 10 Mar 2017 09:29:24 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7276F286F9 for ; Fri, 10 Mar 2017 09:29:24 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 66EBD28706; Fri, 10 Mar 2017 09:29:24 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id E0689286F9 for ; Fri, 10 Mar 2017 09:29:23 +0000 (UTC) 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:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=TS3nhil9C8pd2DkCRvYXxXPR7Wo2Q/Twhr6bosn3KJU=; b=Bp1EiMPKhEBneH JkypFeNZ3fAEnDEOxecr01Mt6Kqn+1Xur5lSJ24h1rsU/wcca6uH7WFCAT3YWYXF/THMlc4IIPFET pItvenFYNwOmSO6IhmU7Sh1NZK/La/U3NKSAzIV1Al0CxHbcKSS5cGGiyw/bQLFy27lK2TjSTotyA HgqWVzn4WLnSamrLmo5p16EmbZawG7tm8I1Sbz7a7bE3oCZxqw0J40pVLTCLRL9KnKZut8X9Ty7Yf LkjZdZuanZhiDb+wbeTKbUrd+GTUPFuNeT2Ygjw8v/upd79ZYtECjy9ivBNTGoBA0lQpQmDAaUScA 8zFTECZd2BivUenyvS9g==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1cmGrT-0006X8-I9; Fri, 10 Mar 2017 09:29:23 +0000 Received: from mail.linuxfoundation.org ([140.211.169.12]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1cmGrM-0006CY-7l for linux-arm-kernel@lists.infradead.org; Fri, 10 Mar 2017 09:29:21 +0000 Received: from localhost (LFbn-1-12060-104.w90-92.abo.wanadoo.fr [90.92.122.104]) by mail.linuxfoundation.org (Postfix) with ESMTPSA id AAE2BA48; Fri, 10 Mar 2017 09:28:54 +0000 (UTC) From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Subject: [PATCH 4.10 038/167] coresight: fix kernel panic caused by invalid CPU Date: Fri, 10 Mar 2017 10:08:01 +0100 Message-Id: <20170310083959.417193928@linuxfoundation.org> X-Mailer: git-send-email 2.12.0 In-Reply-To: <20170310083956.767605269@linuxfoundation.org> References: <20170310083956.767605269@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170310_012916_417315_643101D2 X-CRM114-Status: UNSURE ( 9.87 ) X-CRM114-Notice: Please train this message. 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: Wang Nan , Xia Kaixu , Mathieu Poirier , Greg Kroah-Hartman , stable@vger.kernel.org, Li Zefan , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP 4.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Wang Nan commit f09444639099584bc4784dfcd85ada67c6f33e0f upstream. Commit d52c9750f150 ("coresight: reset "enable_sink" flag when need be") caused a kernel panic because of the using of an invalid value: after 'for_each_cpu(cpu, mask)', value of local variable 'cpu' become invalid, causes following 'cpu_to_node' access invalid memory area. This patch brings the deleted 'cpu = cpumask_first(mask)' back. Panic log: $ perf record -e cs_etm// ls Unable to handle kernel paging request at virtual address fffe801804af4f10 pgd = ffff8017ce031600 [fffe801804af4f10] *pgd=0000000000000000, *pud=0000000000000000 Internal error: Oops: 96000004 [#1] SMP Modules linked in: CPU: 33 PID: 1619 Comm: perf Not tainted 4.7.1+ #16 Hardware name: Huawei Taishan 2280 /CH05TEVBA, BIOS 1.10 11/24/2016 task: ffff8017cb0c8400 ti: ffff8017cb154000 task.ti: ffff8017cb154000 PC is at tmc_alloc_etf_buffer+0x60/0xd4 LR is at tmc_alloc_etf_buffer+0x44/0xd4 pc : [] lr : [] pstate: 60000145 sp : ffff8017cb157b40 x29: ffff8017cb157b40 x28: 0000000000000000 ...skip... 7a60: ffff000008c64dc8 0000000000000006 0000000000000253 ffffffffffffffff 7a80: 0000000000000000 0000000000000000 ffff0000080872cc 0000000000000001 [] tmc_alloc_etf_buffer+0x60/0xd4 [] etm_setup_aux+0x1dc/0x1e8 [] rb_alloc_aux+0x2b0/0x338 [] perf_mmap+0x414/0x568 [] mmap_region+0x324/0x544 [] do_mmap+0x334/0x3e0 [] vm_mmap_pgoff+0xa4/0xc8 [] SyS_mmap_pgoff+0xb0/0x22c [] sys_mmap+0x18/0x28 [] el0_svc_naked+0x24/0x28 Code: 912040a5 d0001c00 f873d821 911c6000 (b8656822) ---[ end trace 98933da8f92b0c9a ]--- Signed-off-by: Wang Nan Cc: Xia Kaixu Cc: Li Zefan Cc: Mathieu Poirier Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Fixes: d52c9750f150 ("coresight: reset "enable_sink" flag when need be") Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman --- drivers/hwtracing/coresight/coresight-etm-perf.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/hwtracing/coresight/coresight-etm-perf.c +++ b/drivers/hwtracing/coresight/coresight-etm-perf.c @@ -242,6 +242,7 @@ static void *etm_setup_aux(int event_cpu if (!sink_ops(sink)->alloc_buffer) goto err; + cpu = cpumask_first(mask); /* Get the AUX specific data from the sink buffer */ event_data->snk_config = sink_ops(sink)->alloc_buffer(sink, cpu, pages,