From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexandre Belloni Subject: Re: 3.14.3-rt5: at91: Crash early at boot Date: Mon, 16 Mar 2015 19:30:33 +0100 Message-ID: <20150316183033.GH4560@piout.net> References: <20140613142506.GL3448@lukather> <20150217083859.GB26177@linutronix.de> <20150316181900.GA4638@lukather> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Sebastian Andrzej Siewior , linux-rt-users@vger.kernel.org, Nicolas Ferre , Thomas Petazzoni To: Maxime Ripard Return-path: Received: from down.free-electrons.com ([37.187.137.238]:36281 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932670AbbCPSb0 (ORCPT ); Mon, 16 Mar 2015 14:31:26 -0400 Content-Disposition: inline In-Reply-To: <20150316181900.GA4638@lukather> Sender: linux-rt-users-owner@vger.kernel.org List-ID: Hi Maxime, On 16/03/2015 at 19:19:00 +0100, Maxime Ripard wrote : > Hi, >=20 > On Tue, Feb 17, 2015 at 09:38:59AM +0100, Sebastian Andrzej Siewior w= rote: > > * Maxime Ripard | 2014-06-13 16:25:06 [+0200]: > >=20 > > >Preemptible hierarchical RCU implementation. > > >NR_IRQS:16 nr_irqs:16 16 > > >Unable to handle kernel NULL pointer dereference at virtual addres= s 00000000 > > >pgd =3D c0004000 > > >[00000000] *pgd=3D00000000 > > >Internal error: Oops: 5 [#1] PREEMPT ARM > > >Modules linked in: > > >CPU: 0 PID: 0 Comm: swapper Not tainted 3.14.3-rt4+ #11 > > >task: c05ecb28 ti: c05e2000 task.ti: c05e2000 > > >PC is at wake_up_process+0x8/0x40 > > >LR is at kthread_create_on_node+0xb0/0x178 > > =E2=80=A6 > > >Do you know what could be the cause of this, or is this any known = issue? > >=20 > > No. This is very early in the boot process. I upgrade the at91's ti= mer > > patches but have no HW to actually check if this is still working. >=20 > Do you have a link to these patches? >=20 The issue has been solved at emtrion but I think the patches were not sent yet. The issue is that threading the timer IRQs leads to a crash because kthreadd is not started yet. --=20 Alexandre Belloni, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe linux-rt-user= s" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html