Parses panic stack traces, densifies and deduplicates goroutines with similar stack traces. Helps debugging crashes and deadlocks in heavily parallelized process.

• 50% more compact output than original stack dump yet more readable.

• Exported symbols are bold, private symbols are darker.
• Stdlib is green, main is yellow, rest is red.
• Deduplicate redundant goroutine stacks. Useful for large server crashes.
• Arguments as pointer IDs instead of raw pointer values.
• Pushes stdlib-only stacks at the bottom to help focus on important code.
• Usable as a library!
• Works on Windows.

Converts this hard to read stack dump into something nicer:

go get github.com/maruel/panicparse/cmd/pp

Run test and prints a concise stack trace upon deadlock in bash

go test -v |&pp

|& tells bash to redirect stderr to stdout, it's an alias for 2>&1 |. panic() and Go's native deadlock detector always print to stderr.

On Windows, use:

go test -v 2>&1 | pp

On POSIX, use Ctrl-\ to send SIGQUIT to your process, pp will ignore the signal and will parse the stack trace.

To dump to a file then parse, pass the file path of a stack trace

go test 2> stack.txt
pp stack.txt

You may have the Perl PAR Packager installed. Use long name panicparse then;

go get github.com/maruel/panicparse