A short reproducer for https://bugs.ruby-lang.org/issues/16682

crasher.rb

require_relative 'tracepoint_crash'
RubyTracePointCrash.enable

extconf.rb

require 'mkmf'

$CFLAGS = "-Wall"

create_makefile('tracepoint_crash/tracepoint_crash')

run.sh

#!/bin/bash
# To run, put all the files in this gist in a empty directory then run this script
ruby extconf.rb && make clean && make && ruby -v crasher.rb

tracepoint_crash.c

#include <ruby.h>
#include <ruby/debug.h>

static VALUE tracepoint = Qnil;

static void
gctracker_hook(VALUE tpval, void *data)
{
    fprintf(stderr, "hook is called\n");
}

static VALUE
tracepoint_enable(VALUE klass)
{
    rb_event_flag_t events;
    events = RUBY_INTERNAL_EVENT_GC_EXIT;
    tracepoint = rb_tracepoint_new(Qnil, events, gctracker_hook, NULL);
    rb_global_variable(&tracepoint);

    rb_tracepoint_enable(tracepoint);
    fprintf(stderr, "tp is %ld and it is now enabled\n", tracepoint);
    return Qtrue;
}

void
Init_tracepoint_crash()
{
    VALUE cRubyTracePointCrash = rb_define_class("RubyTracePointCrash", rb_cObject);

    rb_define_module_function(cRubyTracePointCrash, "enable", tracepoint_enable, 0);
}