From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751375AbcGNTTi (ORCPT ); Thu, 14 Jul 2016 15:19:38 -0400 Received: from smtp.opengridcomputing.com ([72.48.136.20]:55541 "EHLO smtp.opengridcomputing.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751113AbcGNTTg (ORCPT ); Thu, 14 Jul 2016 15:19:36 -0400 From: "Steve Wise" To: "'nborisov'" , References: <007001d1ce27$17845550$468cfff0$@opengridcomputing.com> <576D4C77.8010404@gmail.com> <00b401d1ce2a$cace6fd0$606b4f70$@opengridcomputing.com> <576D61C3.6030509@gmail.com> <014e01d1ce55$aa4ba040$fee2e0c0$@opengridcomputing.com> <00ca01d1dc58$52f00730$f8d01590$@opengridcomputing.com> In-Reply-To: <00ca01d1dc58$52f00730$f8d01590$@opengridcomputing.com> Subject: RE: vmcore not getting created on linux-4.7 Date: Thu, 14 Jul 2016 14:19:39 -0500 Message-ID: <02cc01d1de04$aaaaf0e0$0000d2a0$@opengridcomputing.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQHw+JIfyrncQv60OhHhf+PiSDdJCQFHSXhBAgl2yzMCUZrWgwEZaF10AYAmlsifmDgTQA== Content-Language: en-us Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > > > > Updating to 1.6.0 of makedumpfile didn't help. :( > > > > Does anyone else have suggestions on how to debug this? From my original > post, the dump kernel just reboots and I'm not sure why. Where can I add > printks to gather more info on why the dump kernel gives on on the dump? Seems this issue was a bug in makedumpfile that is fixed with this commit: commit 2c21d4656e8d3c2af2b1e14809d076941ae69e96 Author: Vitaly Kuznetsov Date: Fri Jun 17 18:41:26 2016 +0900 [PATCH v2] Support _count -> _refcount rename in struct page _count member was renamed to _refcount in linux commit 0139aa7b7fa12 ("mm: rename _count, field of the struct page, to _refcount") and this broke makedumpfile. The reason for making the change was to find all users accessing it directly and not through the recommended API. I tried suggesting to revert the change but failed, I see no other choice than to start supporting both _count and _refcount in makedumpfile. Signed-off-by: Vitaly Kuznetsov I found this fix in the devel branch of git://git.code.sf.net/p/makedumpfile/code. I'm surprised others aren't seeing this? All 6 of my development systems stop being able to get vmcore dumps with 4.7-rc... Steve.