Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755507AbdCJRhy (ORCPT ); Fri, 10 Mar 2017 12:37:54 -0500 Received: from esa6.hgst.iphmx.com ([216.71.154.45]:31094 "EHLO esa6.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755338AbdCJRho (ORCPT ); Fri, 10 Mar 2017 12:37:44 -0500 X-IronPort-AV: E=Sophos;i="5.36,141,1486396800"; d="scan'208";a="2281719" Authentication-Results: spf=pass (sender IP is 74.221.232.55) smtp.mailfrom=sandisk.com; linutronix.de; dkim=none (message not signed) header.d=none;linutronix.de; dmarc=bestguesspass action=none header.from=sandisk.com; X-AuditID: ac1c2134-b9d8b98000005688-8b-58c2e460d73c From: Bart Van Assche To: "mingo@kernel.org" CC: "tglx@linutronix.de" , "torvalds@linux-foundation.org" , "linux-kernel@vger.kernel.org" , "hpa@zytor.com" , "akpm@linux-foundation.org" Subject: Re: [GIT pull] CPU hotplug updates for 4.9 Thread-Topic: [GIT pull] CPU hotplug updates for 4.9 Thread-Index: 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Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by mail.home.local id v2AHbvWA015914 Content-Length: 1230 Lines: 27 On Fri, 2017-03-10 at 08:23 +0100, Ingo Molnar wrote: > * Bart Van Assche wrote: > > Anyway, the result of a new bisect I ran is as follows: > > * good: 631ddaba5905 ("Merge branches 'pm-sleep' and 'powercap'"). > > * good: 80f1b3dea9d4 ("Merge branch 'device-properties'"). > > * bad: a67485d4bf97 ("Merge tag 'acpi-4.10-rc1' of > > git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm"). > > > > Does this make sense to you? > > The bisection information is really useful, if the failure mode is deterministic. > > It would be nice to have more bisection points, the above range is about 5,000 > commits. Hello Ingo, Sorry that I had mentioned such a big range of commits. The bisect process actually pointed out a single commit as the first bad commit. I had not mentioned that information because I did not trust it. Anyway, when I tried to reproduce the hang this morning with the commit marked as "bad" the hang did not occur. I think this means the hang is reproducible most of the time but not always. That probably explains why none of my two bisect attempts so far pointed at a commit that introduced the hang. I'll try to find a way to reproduce the hang reliably. Bart.