On 05/13/2014 11:32 PM, Tony Lindgren wrote:
- Alex Shi alex.shi@linaro.org [140512 23:37]:
On 05/13/2014 05:21 AM, Tony Lindgren wrote:
- Paul E. McKenney paulmck@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. :(
Regards,
Tony