Queries stuck in MDB waiting for an answer from PP

PrimProc runs multiple parts of a query called primitive jobs.
There is a problem that causes primitive in-memory representation to become corrupted so it cannot be stopped and doesn't go away from PP execution thread pool. When there is a certain number of such primitives it is enough to get busy all worker threads in PP.
Effectively this looks like all future query are stuck.
The issue hits our CI. One of the customers also suffers from the same issue.