Submitted by hack3r-0m
https://github.com/code-423n4/2021-11-streaming/blob/main/Streaming/src/Locke.sol#L229
reverts due to overflow for higher values (but strictly less than type(uint112).max) and hence when user calls exit or withdraw function it will revert and that user will not able to withdraw funds permanentaly.
Attaching diff to modify tests to reproduce behaviour:
Manual Review
Consider doing arithmetic operations in two steps or upcasting to u256 and then downcasting. Alternatively, find a threshold where it breaks and add require condition to not allow total stake per user greater than threshhold.
brockelmore (Streaming Protocol) confirmed 
