FUNCTION::PRINT_UBAC(3stap)

✨ FUNCTION::PRINT_UBAC(3stap) ✨

okay bestie, welcome to the Context Functions corner of the SystemTap Tapset Reference (section 3stap, we're fancy like that 💅). pull up a chair, we're talking stack backtraces 🦋

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🎀 NAME 🎀

function::print_ubacktrace — prints the stack back trace for the current user-space task. yes, the current user-space task. she's nosy like that 💖

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🌸 SYNOPSIS 🌸

1) print_ubacktrace()

2) print_ubacktrace(pc:long,sp:long,fp:long)

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💜 ARGUMENTS 💜

• pc — override PC 🫶
• sp — override SP 🫶
• fp — override FP 🫶

like, you get to hand-pick the registers instead of letting her figure it out herself. main character behaviour fr.

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✨ DESCRIPTION ✨

1. the plain one — no extra deets, she just does the thing.
2. this one is equivalent to print_ustack(ubacktrace), EXCEPT that deeper stack nesting may be supported. Returns nothing (ngl, she's a yapper not a gifter — no return value, periodt). Wanna see the kernel version instead? See print_backtrace for kernel backtrace 👑

she's also equivalent to print_ubacktrace, but she does the backtrace using the pc, sp, and fp that you provide. Useful.

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💀 NOTE 💀

bestie, listen. if you want (full) backtraces for user space applications and shared libraries that aren't mentioned in the current script, you have to run stap with -d /path/to/exe-or-so and/or add --ldd to load all the needed unwind data. no shortcut, no cap. that's the whole vibe check right there 😭

(also the original page says "shared shared libraries" and honestly? iconic. we stan a typo 👑)

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🌈 SEE ALSO 🌈

• tapset::ucontext-unwind(3stap)
• tapset::ucontext-unwind(3stap)

(yes, it's listed twice. twinning fr fr 🫶)

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SystemTap Tapset Reference, version whatever-the-hell-it-says, dated September 2026 — and that's the whole page, bestie! go forth and unwind those stacks 🌸✨💖 🦋 🎀