---
name: "function::ubacktrace"
section: "3stap"
platform: "linux"
package: "systemtap-doc"
version: "5.1-5"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/function::ubacktrace"
---

# function::ubacktrace(3stap)

Hex backtrace of current user-space task stack.

## NAME

function::ubacktrace - Hex backtrace of current user-space task stack.

## SYNOPSIS

```
    ubacktrace:string()
```

## ARGUMENTS

None

## DESCRIPTION

Return a string of hex addresses that are a backtrace of the stack of the current task. Output may be truncated as per maximum string length. Returns empty string when current probe point cannot determine user backtrace. See **backtrace** for kernel traceback.

## NOTE

To get (full) backtraces for user space applications and shared shared libraries not mentioned in the current script run stap with -d /path/to/exe-or-so and/or add --ldd to load all needed unwind data.

## SEE ALSO0

[*tapset::ucontext-unwind*(3stap)](/tapset::ucontext-unwind/3stap.md)