Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932452AbaFCA4l (ORCPT ); Mon, 2 Jun 2014 20:56:41 -0400 Received: from mail-ve0-f174.google.com ([209.85.128.174]:63110 "EHLO mail-ve0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751756AbaFCA4k (ORCPT ); Mon, 2 Jun 2014 20:56:40 -0400 MIME-Version: 1.0 From: Andy Lutomirski Date: Mon, 2 Jun 2014 17:56:19 -0700 Message-ID: Subject: 3.15 regression: wrong cgroup magic To: "linux-kernel@vger.kernel.org" , Tejun Heo , Li Zefan , Linux FS Devel , Linus Torvalds Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Sorry I didn't notice this earlier. Linux 3.15 breaks my production system :( The cause appears to be: commit 2bd59d48ebfb3df41ee56938946ca0dd30887312 Author: Tejun Heo Date: Tue Feb 11 11:52:49 2014 -0500 cgroup: convert to kernfs In particular, this piece: - sb->s_magic = CGROUP_SUPER_MAGIC; The result is that cgroup shows up with the wrong magic number, so my code goes "oh crap, cgroupfs isn't mounted" and fails. I can change my code to hack around this, but I can imagine other things getting tripped up. Is there still time to fix this? --Andy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/