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This article explains the inner workings of the classic strace command by walking through a handcrafted implementation that uses ptrace to attach to a target process, capture its system calls, read the ORIG_RAX register, and print the syscall name, while also detailing the relevant kernel source code.
When initializing a MySQL 5.7.44 instance, the server aborts because the configuration file lacks a trailing newline, causing the parser to misinterpret the final '!includedir' line and report a missing '/etc/my.cnf.' directory, which can be resolved by adding a newline at the end of the file.
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After migrating a project to the MDP framework based on Spring Boot, the system repeatedly reported high swap usage despite a 4 GB heap configuration, leading to an investigation that uncovered native memory consumption caused by unchecked JAR scanning and allocator behavior, which was resolved by limiting scan paths and updating Spring Boot's inflater implementation.
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A colleague noticed a 15‑second pause between the first two ping replies to pop3.sina.net, prompting a deep dive with tcpdump, strace, and DNS tests that revealed the delay was caused by slow local DNS resolution rather than network latency.
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