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systemtapprobe

systemtap probing by line number "analysis failed"

Using systemtap with file name and line number is generating an error, where as using the (mangled) function name is fine. What am I doing wrong here?

// fails with 
// semantic error: no match
// Pass 2: analysis failed.  [man error::pass2]
probe process("a.out").statement("*@hello.cpp:5") {
  printf("in test\n")
}

// succeeds
probe process("a.out").function("_Z4testv").return {
  printf("in test\n")
}

//content of source of a.out 
#include <iostream>

void test() {
  int a = 1;
  std::cout << "Hello World!";
}

int main()
{
  test();
}

//stap command
sudo stap  a.stp -c "./a.out"

linux version 3.10.0-229.el7.x86_64

stap version 2.8/0.160

directory content: a.out hello.cpp a.stp

Solution

  • This would be the expected behaviour if your program lacks debuginfo but has a symbol table - i.e., if it was compiled without CFLAGS=-g.