From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756129AbaJXKcI (ORCPT ); Fri, 24 Oct 2014 06:32:08 -0400 Received: from foss-mx-na.foss.arm.com ([217.140.108.86]:48033 "EHLO foss-mx-na.foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752195AbaJXKcH (ORCPT ); Fri, 24 Oct 2014 06:32:07 -0400 Date: Fri, 24 Oct 2014 11:31:58 +0100 From: Catalin Marinas To: Z Lim Cc: Andre Przywara , Will Deacon , LAKML , LKML Subject: Re: BPF crash with 3.18-rc1 on arm64 Juno hardware Message-ID: <20141024103158.GB1955@localhost> References: <54493433.4090703@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Oct 23, 2014 at 06:23:49PM +0100, Z Lim wrote: > On Thu, Oct 23, 2014 at 10:00 AM, Andre Przywara wrote: > > I see a crash with 3.18-rc1 on a Juno board related to bpf_jit (see dump > > below). Userland tries to carry on afterwards, but eventually hangs in > > RCU stalls. > > The kernel has just CONFIG_BPF_JIT enabled, I guess Ubuntu enables this > > automatically if detected. > > When net-next and arm64-next merged in mainline, a silent failure is > introduced due to new enhancements in net/bpf. > This was actually uncovered before 3.18 merge window, and Daniel's > patch to fix this was discussed here [1]. > I see that Catalin has queued up this patch in fixes/core [2]. Indeed. Pull request to Linus will go out later today. -- Catalin