Concurrency

3,200% CPU Utilization

An in-depth analysis of a critical Java performance issue where unprotected concurrent TreeMap modifications led to 3,200% CPU utilization. The investigation revealed how thread interleaving can create infinite loops in red-black trees, with experiments across multiple programming languages demonstrating similar vulnerabilities.

Tokio + prctl = nasty bug

A detailed analysis of a bug in HyperQueue where tasks were unexpectedly terminated after 10 seconds due to an interaction between tokio thread management, PR_SET_PDEATHSIG, and process spawning optimization. The bug emerged from moving process spawning to a worker thread, causing processes to receive SIGTERM when tokio cleaned up idle threads.