What problems have you encountered at the Linux kernel level?

Working with the Linux kernel, I often encountered the following issues:

• Device driver debugging — identifying and fixing errors in kernel modules that lead to crashes or memory leaks.

• Performance and locking issues — analyzing causes of deadlocks and optimizing scheduler performance.

• Network stack configuration and debugging — resolving network interface problems, configuring iptables, and eliminating packet loss.

• Working with filesystems — fixing mount errors, recovering from failures, and optimizing access.

• Memory management issues — analyzing memory leaks, configuring caching and swapping parameters.

• Kernel updating and patching — integrating patches, building custom kernel versions for specific tasks.

Example: During USB device driver debugging, I identified an issue with incorrect interrupt handling, which caused system hangs. The solution involved proper synchronization of access to shared resources and using spinlocks.