Return-path: Received: from ackle.nomi.cz ([81.31.33.35]:51074 "EHLO ackle.nomi.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751007Ab2BMN3l (ORCPT ); Mon, 13 Feb 2012 08:29:41 -0500 Date: Mon, 13 Feb 2012 14:29:37 +0100 From: =?utf-8?B?VG9tw6HFoSBKYW5vdcWhZWs=?= To: Stanislaw Gruszka Cc: wwguy , "linux-kernel@vger.kernel.org" , "linux-wireless@vger.kernel.org" Subject: Re: iwlagn: memory corruption with WPA enterprise Message-ID: <20120213132937.GA17203@nomi.cz> (sfid-20120213_142959_726301_53A536D3) References: <20111111150105.GA25437@nomi.cz> <20111114140714.GD2513@redhat.com> <20111119181106.GA5515@nomi.cz> <1321755233.22510.1.camel@wwguy-ubuntu> <20111120032016.GA14520@nomi.cz> <1321763314.22510.4.camel@wwguy-ubuntu> <20111120204007.GA7273@nomi.cz> <20120210180929.GA17733@nomi.cz> <20120213092538.GA6214@redhat.com> <20120213130903.GA7355@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 In-Reply-To: <20120213130903.GA7355@redhat.com> Sender: linux-wireless-owner@vger.kernel.org List-ID: Hi, On Mon, Feb 13, 2012 at 02:09:04PM +0100, Stanislaw Gruszka wrote: > I also found this bug report > https://bugzilla.kernel.org/show_bug.cgi?id=37742 > where one user report iwlwifi corruption catched by IOMMU. I wasn't able to catch anything using IOMMU, and I also wasn't able to reproduce the issue using any userspace memory checking tool. Hence I tend to believe we're not dealing with a memory corruption at all, perhaps something like certain CPU flags/registers not being correctly saved/restored during wlan interrupts or something. When I have a sufficient amount of free time, I'll try to check this hypothesis and perhaps pinpoint the instruction the result of which is corrupted during wlan operation. > Tomáš, I do not remember, do you have the same problems on > older kernels i.e < 3.0 Yeah. I was able to reproduce it with 2.6.38.8 and 2.6.39.4 at least. Regards, -- Tomáš Janoušek, a.k.a. Liskni_si, http://work.lisk.in/