We just had a production lpar lockup due to a SPIN LOOP.
With the dumps taken it appears to be waiting for CA PDSMAN.
After an upgrade of the operating system a spin loop seemed to occur and it was waiting on CA PDSMAN SVCs.
z/OS 2.2CA PDSMAN 7.7
The appearance that CA PDSMAN was the cause is not accurate. IBM discovered the rel problem and it was resolved by the following :
IBM PTF UA93670