From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Shi Subject: Re: RCU stall on panda Date: Thu, 22 May 2014 16:59:45 +0800 Message-ID: <537DBC81.2090809@linaro.org> References: <53675C5F.10509@linaro.org> <20140505180617.GM8754@linux.vnet.ibm.com> <20140512212102.GF5668@atomide.com> <5371BD69.8010600@linaro.org> <20140513153220.GC16837@atomide.com> <53747E6D.60500@linaro.org> <53748371.5030704@linaro.org> <5374C07C.1070400@linaro.org> <20140515183247.GF23659@atomide.com> <5375091D.3010607@ti.com> <5375C145.6070904@linaro.org> <537614AF.50100@ti.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from mail-pb0-f52.google.com ([209.85.160.52]:60912 "EHLO mail-pb0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751621AbaEVI7u (ORCPT ); Thu, 22 May 2014 04:59:50 -0400 Received: by mail-pb0-f52.google.com with SMTP id rr13so2312663pbb.25 for ; Thu, 22 May 2014 01:59:49 -0700 (PDT) In-Reply-To: <537614AF.50100@ti.com> Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: Santosh Shilimkar , Tony Lindgren Cc: Daniel Lezcano , "Paul E. McKenney" , "naresh.kamboju@linaro.org Kamboju" , Linaro Kernel , LAK , Mark Brown , "linux-omap@vger.kernel.org" On 05/16/2014 09:37 PM, Santosh Shilimkar wrote: > On Friday 16 May 2014 03:41 AM, Alex Shi wrote: >> On 05/16/2014 02:36 AM, Santosh Shilimkar wrote: >>>>>>> yes. >>>>>>> My board is panda ES. without this revert, it works. >>>>> >>>>> Care to specify what linux version you are testing against? >>>>> >>>>> Does it hang in idle always immediately on booting? >>>>> >>>>> Or does the serial console first hang with sysrq still >>>>> working (ctrl-a h in minicom for help) with device >>>>> eventually locking up hard? >>>>> >>> I just posted an updated patch Alex on other thread. >>> Attaching here again for your reference. Please try >>> it out and see if the you still get a hang. >> >> it does not hang this time. >> > This is good news and exactly what I expected. > >> but I am not sure it can solve my problem, since RCU stall is not easy >> to reproduce in short time. >> > You may want to run the system longer if you can. I suspect the RCU stall > was also side effect of missing interrupts. Sure. it do remove the RCU stall on my panda board. > > Regards, > Santosh > -- Thanks Alex