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Softlockup and Hardlockup sample test module

Hi All,

Could you please provide some sample test module for causing a
Softlockup and Hardlockup in latest kernel for SMP for testing
purposes. I assume there are some Kconfigs to be enabled as well for

I had tried with the module where I put a busy loop inside spinlock
but was not able to cause any lockups. Maybe this is because of SMP
which schedule the job to other CPU. "How do I make a task to run on
single CPU only?"

I only get RCU stalls sometimes instead of softlockup when I use busy
loop inside a spinlock. Is there any explanation for difference
between these stalls and softlockup.