[Bug c++/24189] New: crash at exit after dlclose with -fuse-cxa-atexit

["hidden_peak at mail dot ru" <gcc-bugzilla at gcc dot gnu dot org>]

Program open DSO with dlopen; DSO has has any C++ global (static) object;
program close DSO with dlclose; crash at program exit. Compiler use
-fuse-cxa-atexit option, compiler was builded as

Reading specs from /opt/gcc-3.4.4/lib/gcc/i686-pc-linux-gnu/3.4.4/specs
Configured with: ./configure --enable-__cxa_atexit --enable-threads
--with-system-zlib --enable-languages=c,c++,java --prefix=/opt/gcc-3.4.4
Thread model: posix
gcc version 3.4.4

Possible crash reason: call of dtor of static object in DSO after DSO was
unloaded. 

Test:
> cat test.cc
#include <dlfcn.h>
//#include <iostream>
//#include <iomanip>

//using namespace std;

typedef void *(*func_type)();

int main()
{
  void *lh = dlopen( "./libtestg.so", RTLD_LAZY );
  //cerr << hex << (unsigned)lh << dec << endl;
  func_type f = (func_type)dlsym( lh, "func" );
  f();
  dlclose( lh );
  return 0;
}

> cat testlib.cc
//#include <iostream>

//using namespace std;

extern "C" void func();

class A
{
  public:
    A();

    ~A();

  private:
    char *p;
};

A::A()
{ /* p = new char [50]; */ }

A::~A()
{ /* delete [] p; */ }


static A a; // <- crash at call cxa_atexit after dlclose?

//static char b[30];

void func()
{
  // A a;
  //a = new A;
  // cerr << "Hello\n";
}

> cat x.sh
#!/bin/bash

CXX=c++

${CXX} -pthread -fexceptions -fident -g -fuse-cxa-atexit -c -o test.o test.cc
${CXX} -pthread -fexceptions -fident -g -fuse-cxa-atexit -nostdlib  -o test
`for o in crt{1,i,begin}.o; do ${CXX} -print-file-name=\$o; done` test.o
-lsupc++ -ldl -lgcc_s -lpthread -lc -lm `for o in crt{end,n}.o; do ${CXX}
-print-file-name=\$o; done`
${CXX} -pthread -fexceptions -fident  -fPIC -g -fuse-cxa-atexit -c -o testlib.o
testlib.cc
${CXX} -pthread -fexceptions -fident  -fPIC -g -fuse-cxa-atexit -shared
-Wl,-hlibtestg.so.0.0 -nostdlib  -o libtestg.so.0.0.0 `for o in
crt{i,beginS}.o; do ${CXX} -print-file-name=\$o; done` testlib.o -lgcc_s
-lsupc++ -lpthread -lc -lm `for o in crt{endS,n}.o; do ${CXX}
-print-file-name=\$o; done`
rm -f libtestg.so.0.0; ln -s libtestg.so.0.0.0 libtestg.so.0.0;
rm -f libtestg.so.0; ln -s libtestg.so.0.0 libtestg.so.0;
rm -f libtestg.so; ln -s libtestg.so.0 libtestg.so

./test


-- 
           Summary: crash at exit after dlclose with -fuse-cxa-atexit
           Product: gcc
           Version: 3.4.4
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: hidden_peak at mail dot ru
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24189