your output could indicate a buffer leak in the supervisor buffers pool. There is a total of 64 buffers in the supervisor and 0 are in the free list. Something is using all the buffers and not freeing them.
Issue the commands:
show buffers old
show buffers pool [pool name] [dump/header]
Which IOS version are you using ? Since buffer leaks are Cisco IOS software bugs, the best solution for this issue is to upgrade the Cisco IOS software to the latest version.
Check out the following document that talks about troubleshooting buffer leaks:
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