From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759257AbZBMI2q (ORCPT ); Fri, 13 Feb 2009 03:28:46 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751509AbZBMI2h (ORCPT ); Fri, 13 Feb 2009 03:28:37 -0500 Received: from mx3.mail.elte.hu ([157.181.1.138]:60725 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750774AbZBMI2g (ORCPT ); Fri, 13 Feb 2009 03:28:36 -0500 Date: Fri, 13 Feb 2009 09:28:20 +0100 From: Ingo Molnar To: David Howells Cc: "Serge E. Hallyn" , KOSAKI Motohiro , LKML , Lee Schermerhorn Subject: Re: [CRED bug?] 2.6.29-rc3 don't survive on stress workload Message-ID: <20090213082820.GC4606@elte.hu> References: <20090212143932.GA10101@us.ibm.com> <20090212202118.0A58.KOSAKI.MOTOHIRO@jp.fujitsu.com> <20090210142443.629E.KOSAKI.MOTOHIRO@jp.fujitsu.com> <27421.1234436992@redhat.com> <27547.1234440246@redhat.com> <12311.1234459104@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <12311.1234459104@redhat.com> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * David Howells wrote: > Serge E. Hallyn wrote: > > > 1. put_user_ns() was being called before the uid (which > > was in the init_user_ns) was unhashed > > Ah yes... but only if CONFIG_USER_NS=y. Otherwise the unhash was being done > before the release anyway. With this option set, the unhash was being deferred > to a workqueue thread. > > Okay, that seems reasonable. Note Serge's fix also fixed a mystery hang/crash on a -tip testbox that has been broken since the merge window. Last night it produced a straight series of 550 bootups - previously it would crash/hang after 20-30 iterations. (i did not report it in this thread before because it's a new testbox with just a few weeks of track record and thus i could not exclude potential hardware trouble) So the bug is very much fixed. Tested-by: Ingo Molnar Ingo