[Bug 278489] dtrace; pid probe; unable to match constructor functions

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278489

            Bug ID: 278489
           Summary: dtrace; pid probe; unable to match constructor
                    functions
           Product: Base System
           Version: 14.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: martin@bxlr.sk

It seems dtrace on FreeBSD is not matching constructor functions during
execution.

Very simple test program:

#include <stdio.h>

void __attribute__((constructor)) myinit() {
        printf("%s: hello\n", __func__);
}

int main() {
        return 42;
}

Listing the probes works as expected:

# dtrace -ln 'pid$target:a.out::entry' -c ./simple
myinit: hello
   ID   PROVIDER            MODULE                          FUNCTION NAME
82966    pid5454            simple             __do_global_dtors_aux entry
82967    pid5454            simple                  register_classes entry
82968    pid5454            simple             __do_global_ctors_aux entry
82969    pid5454            simple                            _start entry
82970    pid5454            simple                              main entry
82971    pid5454            simple                            myinit entry


But when I run it:

# dtrace -n 'pid$target:a.out::entry' -c ./simple
myinit: hello
dtrace: description 'pid$target:a.out::entry' matched 6 probes
dtrace: pid 5458 exited with status 42
CPU     ID                    FUNCTION:NAME
  1  82969                     _start:entry
  1  82970                       main:entry
  1  82966      __do_global_dtors_aux:entry

myinit() is not matched.

This works on Solaris where constructor functions are properly matched.

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