Life & fun · February 10, 2026
Deadlog – almost drop-in mutex for debugging Go deadlocks
I've done this same println debugging thing so many times, along with some sed/awk stuff to figure out which call was causing the issue. Now it's a small Go package. With some `runtime.Callers` I can usually find the spot by just swapping the existing Mutex or RWMutex for this one. Sometimes I switch the mu.Lock() defer mu.Unlock() with the LockFunc/RLockFunc to get more detail defer mu.LockFunc()() I almost always initialize it with `deadlog.New(deadlog.WithTrace(1))` and that's plenty. Not the most polished library, but it's not supposed to land in any commit, just a temporary…
In plain words
Deadlog is a Go package that helps developers debug mutex deadlocks by serving as a drop-in replacement for standard Mutex or RWMutex. It uses runtime call tracing to identify which code is causing lock contention issues, allowing developers to quickly locate problems without manual debugging. The tool is intentionally minimal and temporary, designed for development-time diagnostics rather than production use.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
I've done this same println debugging thing so many times, along with some sed/awk stuff to figure out which call was causing the issue. Now it's a small Go package. With some `runtime.Callers` I can usually find the spot by just swapping the existing Mutex or RWMutex for this one. Sometimes I switch the mu.Lock() defer mu.Unlock() with the LockFunc/RLockFunc to get more detail defer mu.LockFunc()() I almost always initialize it with `deadlog.New(deadlog.WithTrace(1))` and that's plenty. Not the most polished library, but it's not supposed to land in any commit, just a temporary debugging aid. I find it useful.
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