Parse Go Goroutine Panic Stack Trace
Parse Go goroutine panic stack traces. Extract goroutine IDs, function names, file paths, and the panic message from Go runtime error output.
Detailed Explanation
Understanding Go Goroutine Panic Stack Traces
Go panics produce a distinctive stack trace format that includes goroutine information, function names with full package paths, and file locations. Unlike exceptions in other languages, Go panics are designed to crash the program unless explicitly recovered.
Go Panic Stack Trace Format
goroutine 1 [running]:
main.processRequest(0xc000010200)
/app/server/handler.go:45 +0x1a2
main.handleConnection(0xc000008180)
/app/server/server.go:78 +0x89
main.main()
/app/main.go:23 +0x4f
Stack Frame Structure
Go stack traces alternate between two lines per frame:
- Function line --- full package path and function name with arguments (as memory addresses)
- Location line --- file path, line number, and program counter offset (
+0x...)
Goroutine Information
goroutine N [running]:--- the goroutine ID and its stategoroutine N [chan receive]:--- goroutine blocked on a channel operationgoroutine N [sleep]:--- goroutine in atime.Sleepcallgoroutine N [select]:--- goroutine blocked in aselectstatement
Runtime Panics vs Application Panics
- Runtime panics ---
runtime error: index out of range,runtime error: invalid memory address or nil pointer dereference - Application panics --- explicitly called with
panic("message") - Recovered panics --- caught by
recover()in a deferred function, but the original stack trace may be logged
All Goroutines Dump
When GOTRACEBACK=all is set (or by default on panic), Go prints stack traces for all goroutines, not just the one that panicked. This is extremely useful for debugging deadlocks and race conditions, but creates very long output that needs parsing to find the relevant goroutine.
Debugging Tip
Go function arguments in stack traces appear as raw memory addresses (e.g., 0xc000010200). To get meaningful values, you need to use a debugger like Delve or add logging before the panic point.
Use Case
Go panics are encountered in web servers (net/http, Gin, Echo), microservices, CLI tools, and Kubernetes controllers. In production, panics that crash a service generate stack traces in container logs or error monitoring systems. Being able to quickly parse the goroutine ID, identify the panicking goroutine among potentially hundreds, and navigate to the relevant file:line is critical for rapid incident response in Go microservice architectures.