From mboxrd@z Thu Jan 1 00:00:00 1970 From: Santosh Shilimkar Subject: Re: RCU stall on panda Date: Thu, 22 May 2014 09:36:34 -0400 Message-ID: <537DFD62.7040502@ti.com> 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> <537DBC81.2090809@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit Return-path: Received: from devils.ext.ti.com ([198.47.26.153]:56943 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752190AbaEVNhI (ORCPT ); Thu, 22 May 2014 09:37:08 -0400 In-Reply-To: <537DBC81.2090809@linaro.org> Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: Alex Shi , Tony Lindgren Cc: Daniel Lezcano , "Paul E. McKenney" , "naresh.kamboju@linaro.org Kamboju" , Linaro Kernel , LAK , Mark Brown , "linux-omap@vger.kernel.org" On Thursday 22 May 2014 04:59 AM, Alex Shi wrote: > 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. > Thanks for confirming. Tony already send fix upstream so it should show up in next rc mostly From mboxrd@z Thu Jan 1 00:00:00 1970 From: santosh.shilimkar@ti.com (Santosh Shilimkar) Date: Thu, 22 May 2014 09:36:34 -0400 Subject: RCU stall on panda In-Reply-To: <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> <537DBC81.2090809@linaro.org> Message-ID: <537DFD62.7040502@ti.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Thursday 22 May 2014 04:59 AM, Alex Shi wrote: > 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. > Thanks for confirming. Tony already send fix upstream so it should show up in next rc mostly