Python

Fix FastAPI, async, database, caching, concurrency, RAG, LangChain, security, and enterprise backend issues

Hard

Fix Circular Dependency in FastAPI Dependency Injection

Two service classes import each other, causing FastAPI dependency injection failure.

Hard

Fix Async DB Connection Leak in FastAPI

Connections were not closed properly because asyncpg.connect() was being called per request.

Medium

Fix Memory Leak Caused by Background Task Queue

Background tasks were kept forever in a list, preventing garbage collection.

Medium

Fix Race Condition in In-Memory Shared Cache

Multiple concurrent writes corrupted data because dict writes are unsafe without locks.

Medium

Fix Insecure JWT Authentication Implementation

JWT verification was disabled, allowing attackers to forge tokens.

Medium

Fix Low-Recall RAG Retrieval Caused by Bad Chunking Strategy

Chunk size was extremely large, reducing semantic precision.

Hard

Fix Slow RAG Retrieval by Adding Embedding Cache Layer

Embeddings were recomputed on every request, making retrieval slow.

Hard

Fix SQL Injection Vulnerability in Raw Query

User input is directly concatenated into SQL query, allowing SQL injection attacks.

Hard

Fix Deadlock in Multi-Threaded File Processing

Multiple threads lock files in different order, causing deadlocks.

Easy

Fix Memory Leak from Unclosed File Handles

Files are opened but never explicitly closed, causing file handle exhaustion.

Hard

Fix Race Condition in Distributed Task Queue

Multiple workers process the same task because task locking is not implemented.

Hard

Fix GIL Blocking Issue in CPU-Intensive Multi-Threaded Code

Python's GIL prevents true parallelism in multi-threaded CPU-bound tasks, causing poor performance.

Medium

Fix AttributeError from Missing __getattr__ Implementation

Dynamic attribute access fails when attribute doesn't exist, causing AttributeError.

Hard

Fix Memory Leak from Retaining References in Closures

Closure captures large objects, preventing garbage collection and causing memory leaks.

Medium

Fix Import Error from Circular Module Dependencies

Module A imports B, B imports C, C imports A, causing circular import error.

Hard

Fix Pickle Error from Unpicklable Objects

Attempting to pickle objects with lambda functions or file handles causes PickleError.

Medium

Fix Timeout Error in Long-Running Async Operations

Async operation exceeds timeout but doesn't handle cancellation properly, causing resource leaks.

Medium

Fix Database Connection Pool Exhaustion in High Concurrency

Connection pool size is too small for concurrent requests, causing connection timeouts.

Medium

Fix Memory Leak from Unclosed Async Generators

Async generator is not properly closed, causing resource leaks and memory issues.

Medium

Fix Pydantic Validation Error from Nested Model Updates

Updating nested Pydantic model fields doesn't trigger validation, causing invalid state.

Medium

Fix Celery Task Not Retrying on Transient Failures

Celery task fails on transient errors but doesn't retry, causing task loss.

Medium

Fix Thread Safety Issue in Shared Global State

Multiple threads modify shared global dictionary without locks, causing data corruption.

Hard

Fix Memory Leak from Retaining Exception Tracebacks

Exception objects with tracebacks are kept in memory, preventing garbage collection of referenced objects.

Medium

Fix Slow Query Performance from N+1 Database Queries

Looping through objects triggers individual queries for each, causing N+1 query problem.

Hard

Fix Race Condition in File-Based Locking

Multiple processes check file existence and create lock file simultaneously, causing race condition.