From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Lezcano Subject: CONFIG_NO_HZ + CONFIG_CPU_IDLE freeze the system (Was Re: [PATCH] acpi : remove power from acpi_processor_cx structure) Date: Thu, 06 Sep 2012 11:22:32 +0200 Message-ID: <50486B58.7000901@linaro.org> References: <1343164349-28550-1-git-send-email-daniel.lezcano@linaro.org> <50410811.70500@linaro.org> <201209010754.58999.rjw@sisk.pl> <201209051541.58909.rjw@sisk.pl> <50485698.1070905@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: Received: from mail-bk0-f46.google.com ([209.85.214.46]:41036 "EHLO mail-bk0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757123Ab2IFJWh (ORCPT ); Thu, 6 Sep 2012 05:22:37 -0400 Received: by bkwj10 with SMTP id j10so689794bkw.19 for ; Thu, 06 Sep 2012 02:22:35 -0700 (PDT) In-Reply-To: <50485698.1070905@linaro.org> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: "Rafael J. Wysocki" Cc: xen-devel@lists.xensource.com, linaro-dev@lists.linaro.org, Konrad Rzeszutek Wilk , linux-pm@vger.kernel.org, linux-acpi@vger.kernel.org, lenb@kernel.org, Frederic Weisbecker , Linux Kernel Mailing List On 09/06/2012 09:54 AM, Daniel Lezcano wrote: > On 09/05/2012 03:41 PM, Rafael J. Wysocki wrote: >> On Saturday, September 01, 2012, Rafael J. Wysocki wrote: >>> On Friday, August 31, 2012, Daniel Lezcano wrote: >>>> On 07/24/2012 11:06 PM, Konrad Rzeszutek Wilk wrote: >>>>> On Tue, Jul 24, 2012 at 11:12:29PM +0200, Daniel Lezcano wrote: >>>>>> Remove the power field as it is not used. >>>>>> >>>>>> Signed-off-by: Daniel Lezcano >>>>>> Cc: Konrad Rzeszutek Wilk >>>>> Acked. >>>> Hi Rafael, >>>> >>>> I did not see this patch going in. Is it possible to merge it ? >>> I think so. I'll take care of it when I get back from LinuxCon/Plumbers Conf. >>> (early next week). >> Applied to the linux-next branch of the linux-pm.git tree as v3.7 material. > Thanks Rafael. > >> Are there any other patches you want me to consider for v3.7? > Yes please, I have the per cpu latencies ready to be submitted but I > want to do extra testing before. Unfortunately, the linux-pm-next hangs > at boot time on my intel dual core (not related to the patchset). > > I am git bisecting right now. I found the culprit. This is not related to the linux-pm tree but with net-next. The following patch introduced the issue. commit 6bdb7fe31046ac50b47e83c35cd6c6b6160a475d Author: Amerigo Wang Date: Fri Aug 10 01:24:50 2012 +0000 netpoll: re-enable irq in poll_napi() napi->poll() needs IRQ enabled, so we have to re-enable IRQ before calling it. Cc: David Miller Signed-off-by: Cong Wang Signed-off-by: David S. Miller AFAICS, it has been fixed by commit 072a9c48600409d72aeb0d5b29fbb75861a06631 which is not yet in linux-pm-next. I fall into this issue because NETCONSOLE is set, disabling it allowed me to go further. Unfortunately I am facing to some random freeze on the system which seems to be related to CONFIG_NO_HZ=y and CONFIG_CPU_IDLE=y. Disabling one of them, make the freezes to disappear. Is it a known issue ? Thanks in advance -- Daniel