I have extensive experience with C, including pointer arithmetic, memory management, and system calls. I have also worked with Assembly on several projects to optimize performance and for studying computer architecture.

User space is where application software runs and operates with limited privileges. Kernel space is where the core of the operating system functions, with full access to hardware resources. The separation ensures system stability and security.

I use tools like GDB for debugging, along with logging and tracing techniques such as strace and ltrace. I also examine core dumps to understand the state of a program at the time of a crash.

A race condition occurs when two or more threads access shared data and try to change it simultaneously. This can be prevented by using synchronization mechanisms like mutexes, semaphores, or atomic variables to control access to the shared resource.

In a previous project, I optimized a server application by profiling the system to identify bottlenecks, rewriting critical sections in more efficient code, and adjusting memory management strategies. This resulted in a noticeable improvement in processing speed and resource utilization.

System calls are interfaces that allow user-level processes to request services from the kernel. They are used for operations like file management, process control, and communication. For example, the 'open()', 'read()', and 'write()' system calls are used for file operations.