Linux Kernel Journey

Oct 7, 2024 · Operations

retsnoop: Kernel Error Debugging Tool that Traces All Functions and Shows Stack on Failure

retsnoop is an eBPF‑based tracing utility that uses wildcard patterns to hook kernel functions, automatically captures full stack traces whenever a function returns an error, and offers three complementary modes—stack trace, function‑call trace, and LBR—to quickly pinpoint the source of kernel failures, with practical examples and source‑code insights.