Segfault when dlopening/dlclosing two instrumented .so.

lol.c

#include "tracepoints_lol.h"

void
foo (void)
{
  tracepoint (tracepoints_lol, lol, 1);
}

main.c

#include <dlfcn.h>
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>

void
call_lib (const char *name)
{
  const char *error;
  
  void *lib = dlopen (name, RTLD_NOW);
  if (lib == NULL)
    {
      printf("Error: %s\n", dlerror ());
      exit (1);
    }
  assert (lib != NULL);
  
  dlerror ();
  void (*func) (void) = dlsym (lib, "foo");
  error = dlerror ();
  if (error != NULL)
    {
      printf("Error: %s\n", error);
      exit (1);
    }
  
  func ();
  
  int ret = dlclose (lib);
  if (ret != 0)
    {
      printf("Error: %s\n", dlerror ());
      exit (1);
    }
}

int
main (void)
{
  call_lib ("./liblol.so");
  call_lib ("./libmdr.so");
}

Makefile

all: main liblol.so libmdr.so

main: main.c
	gcc -o main main.c -ldl -g3 -O0
	
liblol.so: lol.o tracepoints_lol.o
	gcc -shared -o liblol.so lol.o tracepoints_lol.o -llttng-ust
	
lol.o: lol.c tracepoints_lol.h
	gcc -fpic -c lol.c -g3 -O0
	
libmdr.so: mdr.o tracepoints_mdr.o
	gcc -shared -o libmdr.so mdr.o tracepoints_mdr.o -llttng-ust
	
mdr.o: mdr.c tracepoints_mdr.h
	gcc -fpic -c mdr.c -g3 -O0

tracepoints_lol.o: tracepoints_lol.c
	gcc -fpic -c $< -g3 -O0 -I.

tracepoints_mdr.o: tracepoints_mdr.c
	gcc -fpic -c $< -g3 -O0 -I.

clean:
	rm -rf *.o *.so main

mdr.c

#include "tracepoints_mdr.h"

void
foo (void)
{
  tracepoint (tracepoints_mdr, mdr, 1);
}

tracepoints_lol.c

#define TRACEPOINT_PROBE_DYNAMIC_LINKAGE
#define TRACEPOINT_CREATE_PROBES
/*
 * The header containing our TRACEPOINT_EVENTs.
 */
#define TRACEPOINT_DEFINE
#include "tracepoints_lol.h"

tracepoints_lol.h

#undef TRACEPOINT_PROVIDER
#define TRACEPOINT_PROVIDER tracepoints_lol

#undef TRACEPOINT_INCLUDE
#define TRACEPOINT_INCLUDE "./tracepoints_lol.h"

#if !defined(TRACEPOINTS_LOL_H) || defined(TRACEPOINT_HEADER_MULTI_READ)
#define TRACEPOINTS_LOL_H

#include <lttng/tracepoint.h>

TRACEPOINT_EVENT(tracepoints_lol, lol,
	TP_ARGS (int, hello),
	TP_FIELDS (ctf_integer(int, hello, hello)))

#endif /* TRACEPOINTS_LOL_H */

#include <lttng/tracepoint-event.h>

tracepoints_mdr.c

#define TRACEPOINT_PROBE_DYNAMIC_LINKAGE
#define TRACEPOINT_CREATE_PROBES
/*
 * The header containing our TRACEPOINT_EVENTs.
 */
#define TRACEPOINT_DEFINE
#include "tracepoints_mdr.h"

tracepoints_mdr.h

#undef TRACEPOINT_PROVIDER
#define TRACEPOINT_PROVIDER tracepoints_mdr

#undef TRACEPOINT_INCLUDE
#define TRACEPOINT_INCLUDE "./tracepoints_mdr.h"

#if !defined(TRACEPOINTS_MDR_H) || defined(TRACEPOINT_HEADER_MULTI_READ)
#define TRACEPOINTS_MDR_H

#include <lttng/tracepoint.h>

TRACEPOINT_EVENT(tracepoints_mdr, mdr,
	TP_ARGS (int, hello),
	TP_FIELDS (ctf_integer(int, hello, hello)))

#endif /* TRACEPOINTS_MDR_H */

#include <lttng/tracepoint-event.h>