Unfortunately, Congress has decided that not all debts are dischargeable in bankruptcy. The most common Non-Dischargeable debts are:

Certain taxes, Child support, Alimony, Fines and penalties owed to government agencies, Student loans, Debts incurred through fraud.

Collection actions on such non-dischargeable debts must stop upon the filing of the bankruptcy petition, but the debt survives the bankruptcy and the debtor must repay once the case is over.