Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751621AbbGCGq2 (ORCPT ); Fri, 3 Jul 2015 02:46:28 -0400 Received: from mail-oi0-f44.google.com ([209.85.218.44]:34799 "EHLO mail-oi0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754513AbbGCGqW (ORCPT ); Fri, 3 Jul 2015 02:46:22 -0400 MIME-Version: 1.0 In-Reply-To: <20150703024044.GB24695@verge.net.au> References: <20150703024044.GB24695@verge.net.au> Date: Fri, 3 Jul 2015 08:46:21 +0200 X-Google-Sender-Auth: 401Qd553jfm1rJvZJ0XwFzW_Z1o Message-ID: Subject: Re: Possible regression due to "tick: broadcast: Prevent livelock from event handler" From: Geert Uytterhoeven To: Simon Horman Cc: Thomas Gleixner , Kevin Hilman , Tyler Baker , Borislav Petkov , Geert Uytterhoeven , Magnus Damm , Linux-sh list , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1454 Lines: 39 Hi Simon, On Fri, Jul 3, 2015 at 4:40 AM, Simon Horman wrote: > I have observed what appears to be a regression while testing next-20150702 > which seems to be caused by 2951d5c031a3 ("tick: broadcast: Prevent > livelock from event handler"). > > The problem manifests on the emev2/kzm9d board as per the boot log below. > > The problem manifests when booting using the shmobile_defconfig, > which uses multiplatform and enables all devices using DT. > > The problem does not appear to always manifest but anecdotally it > seems to manifest more often of late (yes, I know that is vague). > hctosys: unable to open rtc device (rtc0) > > The boot hangs here. > The next line should be: > > smsc911x 20000000.ethernet eth0: SMSC911x/921x identified at 0xc8880000, IRQ: 33 As you can reproduce it, can you please try enabling lockdep debugging? Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds -- 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/