On 05/13/2014 11:32 PM, Tony Lindgren wrote: > * Alex Shi <alex.shi@xxxxxxxxxx> [140512 23:37]: >> On 05/13/2014 05:21 AM, Tony Lindgren wrote: >>> * Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> [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 > -- Thanks Alex -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
