RCU stall on panda

[Daniel Lezcano]

On 05/15/2014 10:44 AM, Alex Shi wrote:
> On 05/13/2014 11:32 PM, Tony Lindgren wrote:
>> * Alex Shi <alex.shi at linaro.org> [140512 23:37]:
>>> On 05/13/2014 05:21 AM, Tony Lindgren wrote:
>>>> * Paul E. McKenney <paulmck at linux.vnet.ibm.com> [140505 11:11]:
>>>>> On Mon, May 05, 2014 at 05:39:43PM +0800, Alex Shi wrote:
>>>>>> I keep seeing the RCU stall problem on panda board from 3.10 kernel to latest upstream kernel
>>>>>> and google find some one report it before: https://lkml.org/lkml/2012/9/20/519
>>>>>>
>>>>>> Is it the hardware issue or a real software problem?
>>>>>
>>>>> I cannot distinguish between hardware and software from the trace below,
>>>>> but given that you are also seeing a soft lockup, either way you do
>>>>> appear to have a real problem as opposed to an RCU CPU stall warning
>>>>> false positive.
>>>>
>>>> Looks like you have CPU_IDLE enabled on panda. Hangs with current linux
>>>> next with CPU_IDLE are currently being discussed on the linux-omap list
>>>> in thread "omap4-panda-es boot issues with v3.15-rc4"
>>>>
>>>> I've seen occasional system hangs, and I've also noticed that doing
>>>> ctrl-a-f h or ctrl-a-f l for sysrq backtrace can unlock the system
>>>> producing similar errors to the below.
>>>>
>>>
>>> Thanks a lot for the info.
>>> In fact, the oops keeps in upstream kernel from 3.10 to latest.
>>
>> Care to test if the revert of commit cb7094 Santosh posted as
>> "[PATCH] ARM: OMAP4: Fix the boot regression with CPU_IDLE enabled"
>> solves the problem for you?
>>
>
> After enable this patch, system maybe hang in idle. :(

Hi Alex,

do you mean even with this revert applied, the board hangs in idle ?




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