Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751002Ab0K0Fen (ORCPT ); Sat, 27 Nov 2010 00:34:43 -0500 Received: from mail-gw0-f46.google.com ([74.125.83.46]:45917 "EHLO mail-gw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750727Ab0K0Fek convert rfc822-to-8bit (ORCPT ); Sat, 27 Nov 2010 00:34:40 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=AdPQqg+eXc/kyIWR2yHZJwdA2zPy9HgKuKyuDvrFu9Mp7mlE7ZSAo3EvefcGN9xHuc Ny01Te0cuIWVXSth9b84o1fXs670rWVQdIij+YwO75m5bdzBE7YqxAfpWR2KUFEIIcwG 1NXoya26yt0fL9bSyPKqhjWCQPc8JeA5uLVcA= MIME-Version: 1.0 In-Reply-To: <4CEFD2BA.5090403@kernel.org> References: <4CEFD2BA.5090403@kernel.org> Date: Sat, 27 Nov 2010 00:34:39 -0500 Message-ID: Subject: Re: Possible FPU context corruption w/ CONFIG_PREEMPT From: Brian Gerst To: Tejun Heo Cc: lkml , Suresh Siddha , "H. Peter Anvin" , Robert Richter , Dan Carpenter , Avi Kivity , Bernd Machenschalk , Heinz-Bernd Eggenstein , Oliver Bock , "the arch/x86 maintainers" Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1103 Lines: 30 On Fri, Nov 26, 2010 at 10:31 AM, Tejun Heo wrote: > Hello, guys. > > Heinz-Bernd Eggenstein reports a possible FPU context corruption w/ > CONFIG_PREEMPT.  Please take a look at the following forum post. > >  http://einstein.phys.uwm.edu/forum_thread.php?id=8516 > > openSUSE 11.3 desktop kernel which has CONFIG_PREEMPT set is > triggering SIGFPE while the default kernel w/o preemption works fine. > He also notes that a similar bug was fixed in 2008 by commit 06c38d5e > (x86-64: fix FPU corruption with signals and preemption) from Suresh. > Does it ring anyone's bell? > > Heinz, is there a simple procedure to reproduce the problem, or would > it be possible to lure you into bisection? > > Thanks. > This might be fixed by commit a4d4fbc7735bba6654b20f859135f9d3f8fe7f76 (Disable preemption when using TS_USEDFPU). -- Brian Gerst -- 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/