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CONTAP-320933: mpcleaner thread is hung while adding the buffer pointer to the list

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ontap-9
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CORE
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Issue

A processor on the storage controller panicked as there was long running mpcleaner thread.

Current thread which ran over 5 seconds resulted in a CPU hung panic i.e mpcleaner thread. 

Correctable Machine Check Errors occur which indicate the issue between CPU and memory in L1/L2 cache. This is a not a hardware issue as there are zero count of CECC errors.

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