From mboxrd@z Thu Jan 1 00:00:00 1970 From: Santosh Shilimkar Subject: Re: RCU stall on panda Date: Fri, 16 May 2014 09:37:51 -0400 Message-ID: <537614AF.50100@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> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit Return-path: Received: from comal.ext.ti.com ([198.47.26.152]:48465 "EHLO comal.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932737AbaEPNi0 (ORCPT ); Fri, 16 May 2014 09:38:26 -0400 In-Reply-To: <5375C145.6070904@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 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. Regards, Santosh From mboxrd@z Thu Jan 1 00:00:00 1970 From: santosh.shilimkar@ti.com (Santosh Shilimkar) Date: Fri, 16 May 2014 09:37:51 -0400 Subject: RCU stall on panda In-Reply-To: <5375C145.6070904@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> Message-ID: <537614AF.50100@ti.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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. Regards, Santosh