*** old/src/os_cpu/bsd_x86/vm/os_bsd_x86.cpp	Tue Oct 22 18:51:55 2013
--- new/src/os_cpu/bsd_x86/vm/os_bsd_x86.cpp	Tue Oct 22 18:51:51 2013

*** 826,835 ****
--- 826,843 ----
  static void current_stack_region(address * bottom, size_t * size) {
  #ifdef __APPLE__
    pthread_t self = pthread_self();
    void *stacktop = pthread_get_stackaddr_np(self);
    *size = pthread_get_stacksize_np(self);
+   // workaround for 10.9 (Mavericks)
+   // pthread_get_stacksize_np returns 128 pages even though the actual size is 2048 pages
+   if (pthread_main_np() == 1) {
+     #define DEFAULT_MAIN_THREAD_STACK_PAGES 2048
+     if (*size < (DEFAULT_MAIN_THREAD_STACK_PAGES*(size_t)getpagesize())) {
+       *size = (DEFAULT_MAIN_THREAD_STACK_PAGES*getpagesize());
+     }
+   }
    *bottom = (address) stacktop - *size;
  #elif defined(__OpenBSD__)
    stack_t ss;
    int rslt = pthread_stackseg_np(pthread_self(), &ss);