Provided by: systemtap-doc_2.9-2ubuntu2_all 

NAME
function::print_ubacktrace - Print stack back trace for current user-space task.
SYNOPSIS
print_ubacktrace()
ARGUMENTS
None
DESCRIPTION
Equivalent to print_ustack(ubacktrace), except that deeper stack nesting may be supported. Returns
nothing. See print_backtrace for kernel backtrace.
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 ALSO
tapset::ucontext-unwind(3stap)
SystemTap Tapset Reference April 2016 FUNCTION::PRINT_UBAC(3stap)