From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bruno =?UTF-8?B?UHLDqW1vbnQ=?= Subject: Re: 3.12 to 3.13 boot regression bisected - still applies to 3.16 Date: Tue, 5 Aug 2014 13:51:30 +0200 Message-ID: <20140805135130.2d180b69@pluto> References: <20140804113435.34ed8c76@pluto> <20140804122728.GH15082@console-pimps.org> <20140804150627.4563b6a7@pluto> <20140804135452.GJ15082@console-pimps.org> <20140805100242.425e1093@pluto> <20140805084542.GM15082@console-pimps.org> <20140805111330.3cf9319f@pluto> <20140805091848.GN15082@console-pimps.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <20140805091848.GN15082-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org> Sender: linux-efi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Matt Fleming Cc: P J P , Andrew Morton , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-efi@vger.kernel.org On Tue, 5 Aug 2014 10:18:48 +0100 Matt Fleming wrote: > On Tue, 05 Aug, at 11:13:30AM, Bruno Pr=C3=A9mont wrote: > >=20 > > I get at least to just before > > status =3D efi_call_early(exit_boot_services, handle, key); > > in eboot.c on line 1310. A efi_printk inserted there is displayed. >=20 > This is worth pointing out in case you're unaware, but do you know th= at > it's not valid to call efi_printk() after ExitBootServices()? Doing s= o > will almost certainly cause your machine to fault. I am aware that efi_printk() uses boot services! Now I tried out loops at many places and have gotten up to line 340 in arch/x86/kernel/head_64.S System reboots within the following assembler instructions (does not reach line 359). So efi_main() returns successfully but the assembler code following it gets something wrong. I'm going to try further to determine which line between 340 and 359 is the "bad" one. Bruno From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754912AbaHELvf (ORCPT ); Tue, 5 Aug 2014 07:51:35 -0400 Received: from smtprelay.restena.lu ([158.64.1.62]:34635 "EHLO smptrelay.restena.lu" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753748AbaHELve convert rfc822-to-8bit (ORCPT ); Tue, 5 Aug 2014 07:51:34 -0400 Date: Tue, 5 Aug 2014 13:51:30 +0200 From: Bruno =?UTF-8?B?UHLDqW1vbnQ=?= To: Matt Fleming Cc: P J P , Andrew Morton , linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org Subject: Re: 3.12 to 3.13 boot regression bisected - still applies to 3.16 Message-ID: <20140805135130.2d180b69@pluto> In-Reply-To: <20140805091848.GN15082@console-pimps.org> References: <20140804113435.34ed8c76@pluto> <20140804122728.GH15082@console-pimps.org> <20140804150627.4563b6a7@pluto> <20140804135452.GJ15082@console-pimps.org> <20140805100242.425e1093@pluto> <20140805084542.GM15082@console-pimps.org> <20140805111330.3cf9319f@pluto> <20140805091848.GN15082@console-pimps.org> X-Mailer: Claws Mail 3.9.0 (GTK+ 2.24.24; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 5 Aug 2014 10:18:48 +0100 Matt Fleming wrote: > On Tue, 05 Aug, at 11:13:30AM, Bruno Prémont wrote: > > > > I get at least to just before > > status = efi_call_early(exit_boot_services, handle, key); > > in eboot.c on line 1310. A efi_printk inserted there is displayed. > > This is worth pointing out in case you're unaware, but do you know that > it's not valid to call efi_printk() after ExitBootServices()? Doing so > will almost certainly cause your machine to fault. I am aware that efi_printk() uses boot services! Now I tried out loops at many places and have gotten up to line 340 in arch/x86/kernel/head_64.S System reboots within the following assembler instructions (does not reach line 359). So efi_main() returns successfully but the assembler code following it gets something wrong. I'm going to try further to determine which line between 340 and 359 is the "bad" one. Bruno