FUNCTION::UCALLERS(3stap)

💖 FUNCTION::UCALLERS 💖

okay bestie, welcome to the 3stap manual — yes that's the manual section, it's giving SystemTap tapset reference energy and we're gonna read it together, no cap 🫶

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✨ NAME ✨

function::ucallers — returns the first n elements of a user stack backtrace 🌸

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🎀 SYNOPSIS 🎀

ucallers:string(n:long)

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🦋 ARGUMENTS 🦋

• n — the number of levels to descend in the stack, and bestie, not counting the top level. if n is -1, it prints the entire stack. periodt 💅

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⭐ DESCRIPTION ⭐

so this function returns a string of the first n hex addresses from the backtrace of the user stack. that's the whole vibe. ✨

lowkey important: the output may be truncated as per the maximum string length, aka MAXSTRINGLEN. so if your backtrace looks like it got cut off mid-sentence... yeah, that's why 😭

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💜 NOTE 💜

to get (full) backtraces for user space applications and shared 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 the needed unwind data. do not skip this step, i'm literally begging 🙈

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🌈 SEE ALSO 🌈

tapset::ucontext(3stap)

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that's it, that's the page, you ate it, i'm obsessed 👑

SystemTap Tapset Reference — September 2026 edition, mwah 💋 🎀 🦋 💖