From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755529AbbDIMiI (ORCPT ); Thu, 9 Apr 2015 08:38:08 -0400 Received: from mail-ie0-f174.google.com ([209.85.223.174]:34134 "EHLO mail-ie0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755068AbbDIMiF (ORCPT ); Thu, 9 Apr 2015 08:38:05 -0400 MIME-Version: 1.0 Date: Thu, 9 Apr 2015 13:38:04 +0100 Message-ID: Subject: [BUG] Macbook intermittent boot fail at "Switched to clocksource tsc" From: Chris Bainbridge To: linux-kernel@vger.kernel.org, mjg59@srcf.ucam.org Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit 7bc5a2b -- ACPI: Support _OSI("Darwin") correctly -- has introduced an intermittent boot failure on an IvyBridge Macbook Pro 13 (MacBookPro10,2). The failure rate is around 12%. This was diagnosed by doing a bisect with many boots for each kernel, then verifying failure on 7bc5a2b, and then booting 50 times again with the prior commit (9faf613) to verify that commit was ok (50 boots is necessary to get a high probability >99% of hitting this). Example fail: http://imgur.com//QHWJTYS The failure has been observed up to and including 4.0-rc7. The Apple BIOS is MBP102.88Z.0106.B07.1501071215 01/07/2015