Hardfault (Invalid Stack) message. Clarification needed

Hi, All

During our tests we run over a hardfault that causes autopilot restart. Unfortunately documentation doesn’t describe it clearly.
Can you clear a bit, what does the following message mean:

“Invalid Stack! (Corrupted TCB) Stack base: 603983424 Stack size: 00000512”


It there any documentation describing fault file structure and content?

Thank you in advance.