From mboxrd@z Thu Jan 1 00:00:00 1970 From: Aaron Lu Subject: commit 70fea60d888d caused s2ram regression with WD disk Date: Mon, 15 Jun 2015 10:55:36 +0800 Message-ID: <20150615025536.GA26473@aaronlu.sh.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mga09.intel.com ([134.134.136.24]:63674 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753907AbbFOCye (ORCPT ); Sun, 14 Jun 2015 22:54:34 -0400 Content-Disposition: inline Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: linux-pm@vger.kernel.org Cc: Mark Scott , Takashi Iwai , Benoit Goby , "Rafael J. Wysocki" Hi, As explained by Takashi: " So this looks like the cause. The recent kernel has a watchdog for async resume workers, and if it expires, it panics. This explains why 3.12 worked; the watchdog was introduced since 3.13. The timeout length is unfortunately fixed in Kconfig, set to 12 as default. And this seems too short. We should extend this to at least a minute, I suppose. Also, it'd be better to be dynamically configuratble. " https://bugzilla.opensuse.org/show_bug.cgi?id=934397#c5 The upstream bug page is here: https://bugzilla.kernel.org/show_bug.cgi?id=91921 Since Benoit isn't registered there, I write the email for discussion. Regards, Aaron