From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757319AbcHCIt0 (ORCPT ); Wed, 3 Aug 2016 04:49:26 -0400 Received: from pandora.armlinux.org.uk ([78.32.30.218]:43301 "EHLO pandora.armlinux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756912AbcHCItQ (ORCPT ); Wed, 3 Aug 2016 04:49:16 -0400 Date: Wed, 3 Aug 2016 09:38:22 +0100 From: Russell King - ARM Linux To: Guenter Roeck Cc: "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , Will Deacon Subject: Re: "Failed to create /dev/root: -14" after commit e6978e4bf1 ("ARM: save and reset the address limit when entering an exception") Message-ID: <20160803083822.GI1041@n2100.armlinux.org.uk> References: <57A15C41.6000804@roeck-us.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <57A15C41.6000804@roeck-us.net> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Aug 02, 2016 at 07:51:45PM -0700, Guenter Roeck wrote: > Hi, > > I see the following crash when running a qemu arm 'kzm' runtime test with > the current mainline. >... > Failed to create /dev/root: -14 > > [ followed by panic ] > > A complete log file is at [1]. I think it's because of those undefined instructions you're hitting with the hw-breakpoint code... can you try the patch below please? arch/arm/kernel/entry-armv.S | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S index bc5f50799d75..9f157e7c51e7 100644 --- a/arch/arm/kernel/entry-armv.S +++ b/arch/arm/kernel/entry-armv.S @@ -295,6 +295,7 @@ __und_svc_fault: bl __und_fault __und_svc_finish: + get_thread_info tsk ldr r5, [sp, #S_PSR] @ Get SVC cpsr svc_exit r5 @ return from exception UNWIND(.fnend ) -- RMK's Patch system: http://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net.