Bad Debt Propagation
Bad Debt Propagation occurs when a protocol's inability to liquidate under-collateralized positions leads to a systemic shortfall that cannot be recovered. When an oracle delay allows a position to drop below the required collateralization without being liquidated, the debt exceeds the value of the locked assets.
If the protocol has no insurance fund or surplus to cover this gap, the deficit remains, potentially impacting the entire liquidity pool. This creates a cascading effect where other users lose confidence or cannot withdraw their funds, leading to a bank run.
It is the ultimate failure state in decentralized finance and highlights the importance of fast, accurate price feeds. Preventing this requires robust risk management and rapid response mechanisms.