This TestMacNotification could fail if there is some issue with the bridge ASIC/data path. One of the reason could be some corrupted packets enter the bridge asic and cause the memory buffers to get locked up.
Troubleshooting and Recommendation:
1. Check if there any Fabric CRC errors *"*FABRICCRCERRS" in the logs.
If there are Fabric CRC errors followed by TestMacNotification test failure then issue could be because of CSCto55567 , upgrade to release 12.2(33)SRE5 or higher.
2. If TestMacNotification test fails without Fabric CRC error then contact the BU, it requires complete data path debugging.
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