From patchwork Sun Mar 19 07:15:25 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ding Tianhong X-Patchwork-Id: 95449 Delivered-To: patch@linaro.org Received: by 10.140.89.233 with SMTP id v96csp454073qgd; Sun, 19 Mar 2017 00:24:15 -0700 (PDT) X-Received: by 10.98.61.5 with SMTP id k5mr26365361pfa.229.1489908255293; Sun, 19 Mar 2017 00:24:15 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id d5si13642539pgi.62.2017.03.19.00.24.14; Sun, 19 Mar 2017 00:24:15 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751427AbdCSHW5 (ORCPT + 18 others); Sun, 19 Mar 2017 03:22:57 -0400 Received: from szxga03-in.huawei.com ([45.249.212.189]:4428 "EHLO dggrg03-dlp.huawei.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1751180AbdCSHW4 (ORCPT ); Sun, 19 Mar 2017 03:22:56 -0400 Received: from 172.30.72.54 (EHLO DGGEML402-HUB.china.huawei.com) ([172.30.72.54]) by dggrg03-dlp.huawei.com (MOS 4.4.6-GA FastPath queued) with ESMTP id AKG83799; Sun, 19 Mar 2017 15:15:36 +0800 (CST) Received: from [127.0.0.1] (10.177.23.32) by DGGEML402-HUB.china.huawei.com (10.3.17.38) with Microsoft SMTP Server id 14.3.301.0; Sun, 19 Mar 2017 15:15:32 +0800 To: Catalin Marinas , Will Deacon , Mark Rutland , , "linux-kernel@vger.kernel.org" From: Ding Tianhong Subject: [PATCH] arm64: add dump_stack to show_regs Message-ID: Date: Sun, 19 Mar 2017 15:15:25 +0800 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 MIME-Version: 1.0 X-Originating-IP: [10.177.23.32] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090205.58CE3019.001F, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2014-11-16 11:51:01, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: def3ff0a563453d81ee815905fb4be92 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Recently I found that when the system trigger a soft lockup in interrupt, there is only showing the regs, but no stack trace, it is very difficult to locate the problem: -- 1.9.0 =========================================== [10072.999437] NMI watchdog: BUG: soft lockup - CPU#16 stuck for 23s! [ksoftirqd/16:88] ..... [10073.041254] CPU: 16 PID: 88 Comm: ksoftirqd/16 Tainted: G 4.x.x #1 [10073.041258] Hardware name: xxxxx, BIOS 1.17 01/04/2017 [10073.041261] task: ffff803f6cb06200 ti: ffff803f6cb50000 task.ti: ffff803f6cb50000 [10073.041274] PC is at _raw_spin_unlock_irqrestore+0x24/0x30 [10073.041280] LR is at blk_run_queue+0x3c/0x48 [10073.041282] pc : [] lr : [] pstate: 60000145 [10073.041285] sp : ffff803f6cb53b20 [10073.041286] x29: ffff803f6cb53b20 x28: 0000000000001000 [10073.041290] x27: 0000000000000000 x26: ffff800001226000 [10073.041294] x25: 0000000000000000 x24: 0000000000000140 [10073.041297] x23: ffff803f62e108c8 x22: ffff800001037000 [10073.041302] x21: ffff843f66800040 x20: 0000000000000140 [10073.041305] x19: ffff803f62e108c8 x18: 0000000000000007 [10073.041309] x17: 000000000000000e x16: 0000000000000001 [10073.041312] x15: 0000000000000019 x14: 0000000000000033 [10073.041317] x13: 000000000000004c x12: 0000000000000000 [10073.041320] x11: 0000000000001000 x10: 0000000000000010 [10073.041323] x9 : ffff8000004f3a7c x8 : ffff803f69b59120 [10073.041327] x7 : 0000000000000000 x6 : 0000000000000002 [10073.041331] x5 : 0000000000000244 x4 : 00000000000244d9 [10073.041334] x3 : ffff843f653ab918 x2 : 0000000000004074 [10073.041337] x1 : 0000000000000140 x0 : ffff803f62e10e58 =============================================== So add the general dump_stack to show_regs to support showing the stack. Signed-off-by: Ding Tianhong --- arch/arm64/kernel/process.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c index 043d373..60c5c26 100644 --- a/arch/arm64/kernel/process.c +++ b/arch/arm64/kernel/process.c @@ -212,6 +212,7 @@ void show_regs(struct pt_regs * regs) { printk("\n"); __show_regs(regs); + dump_stack(); } static void tls_thread_flush(void)