Hi Dong,
I tried to disable CONFIG_RT_GROUP_SCHED, but I still got cpu stalls!
Just had another look at your dmesg files. Didn't you get
BUG: soft lockup - CPU#0 stuck for 279s! [swapper/0:0]
before? Now - with CONFIG_RT_GROUP_SCHED disabled - you get:
rcu_preempt detected stalls on CPUs/tasks: { 3} [..]
Is it reproducible? Maybe, there are two different problems. One leads
to soft lockups and is related to CONFIG_RT_GROUP_SCHED, and another one
that leads to rcu_preempt stalls.
-Carsten.
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