FUNCTION::SPRINT_UBA(3stap)

💖 function::sprint_ubacktrace 💖

okay so bestie, welcome to 3stap, the Context Functions chapter of the SystemTap tapset reference, and today's main character is sprint_ubacktrace — she returns a stack back trace for the current user-space task, as a string. periodt. 🎀

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✨ NAME ✨

function::sprint_ubacktrace — returns a stack back trace for the current user-space task, as a string. that's it, that's the whole gig, and she ate. 💅

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🌸 SYNOPSIS 🌸

sprint_ubacktrace:string()

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🦋 ARGUMENTS 🦋

• None — literally nothing, zero, nada, no arguments, she needs no input to serve 💜

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✨ DESCRIPTION ✨

So what she actually does: she returns a simple backtrace for the current task, one line per address. cute, tidy, iconic. 🌈

Each line includes:

• the symbol name — or, if the symbol couldn't be resolved, the hex address instead (no cap, sometimes symbols just ghost you 😭)
• the module name, if found
• the offset from the start of the function, if found — otherwise that offset gets added to the module instead (and if the module was found, it goes between brackets) 🫶

She hands the whole backtrace back to you as a string, with each line terminated by a newline character. chef's kiss.

⚠️ heads up bestie: the returned stack is truncated to MAXSTRINGLEN. if you want fuller and richer stacks, go use print_ubacktrace instead. no cap.

Also worth knowing: she's equivalent to sprint_ustack(ubacktrace), except she's more efficient — because there's no need to translate between hex strings and the final backtrace string. lowkey a flex. 💅

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💀 NOTE 💀

To get (full) backtraces for user space applications and shared libraries that are 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. do this or your backtrace will be giving "where is everybody" energy 🙈

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🎀 SEE ALSO 🎀

• tapset::ucontext-unwind(3stap) — go read her sister's page, the way that tapset family stays booked and busy 👑

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SystemTap Tapset Reference, September 2026 edition — mwah, thanks for reading bestie, now go get those unwound stacks, slay, bye 💖✨🌸