Return-path: Received: from mail-vw0-f46.google.com ([209.85.212.46]:64487 "EHLO mail-vw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752083Ab0DKQrH (ORCPT ); Sun, 11 Apr 2010 12:47:07 -0400 Message-ID: <4bc1fd09.9615f10a.46f6.ffffab58@mx.google.com> Date: Sun, 11 Apr 2010 09:47:05 -0700 (PDT) From: Ben Gamari Subject: Re: [REGRESSION] Lockup inside of stop_machine() during modprobe aes (was Re: Another AR5008 hang) To: Johannes Berg Cc: linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, ath9k@lists.ath9k.org In-Reply-To: <4bbb7896.48c3f10a.30b9.365b@mx.google.com> References: <4bb0e2da.04c2f10a.32b2.11ae@mx.google.com> <1269928986.3927.5.camel@jlt3.sipsolutions.net> <4bb1f940.47c2f10a.3469.609b@mx.google.com> <4bb235fb.0baa660a.5b56.ffffa9c2@mx.google.com> <4bbb7896.48c3f10a.30b9.365b@mx.google.com> Sender: linux-wireless-owner@vger.kernel.org List-ID: On Tue, 06 Apr 2010 11:08:22 -0700 (PDT), Ben Gamari wrote: > Hey all, > > I just built 2.6.34-rc3 with the appropriate fixes for the ACPI thermal lockdep > issues and have attached the dmesg output of the crash below. It appears that > modprobe is freezing with a few locks held while inserting aes.ko. In > particular, it seems that the kernel is deadlocking inside of stop_machine() > while flushing workqueues. > I can confirm that modprobing aes explicitly also results in the stop_machine() deadlock, so this doesn't appear to be an interaction with ath9k or the mac80211 subsystem. Furthermore, if I disable CONFIG_CRYPTO_AES_X86_64 (I'm on a Core Duo platform), aes loads as expected and things work as they should. Any ideas? I'm rather disturbed that this regression has still not had a single reply while -rc4 is so near. - Ben