src/os/aix/vm/vmError_aix.cpp

rev 7758 : 8065895 Synchronous signals during error reporting may terminate or hang VM process
Reviewed-by: dholmes,gziemski
Contributed-by: stuefe

*** 78,113 ****
                                ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
                                : CAST_FROM_FN_PTR(address, sa.sa_handler);
  }
  
  int VMError::get_resetted_sigflags(int sig) {
-   // Handle all program errors.
    for (int i = 0; i < NUM_SIGNALS; i++) {
      if (SIGNALS[i] == sig) {
        return resettedSigflags[i];
      }
    }
    return -1;
  }
  
  address VMError::get_resetted_sighandler(int sig) {
-   // Handle all program errors.
    for (int i = 0; i < NUM_SIGNALS; i++) {
      if (SIGNALS[i] == sig) {
        return resettedSighandler[i];
      }
    }
    return NULL;
  }
  
  static void crash_handler(int sig, siginfo_t* info, void* ucVoid) {
    // Unmask current signal.
    sigset_t newset;
    sigemptyset(&newset);
    sigaddset(&newset, sig);
  
!   Unimplemented();
  }
  
  void VMError::reset_signal_handlers() {
    sigset_t newset;
    sigemptyset(&newset);
--- 78,118 ----
                                ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
                                : CAST_FROM_FN_PTR(address, sa.sa_handler);
  }
  
  int VMError::get_resetted_sigflags(int sig) {
    for (int i = 0; i < NUM_SIGNALS; i++) {
      if (SIGNALS[i] == sig) {
        return resettedSigflags[i];
      }
    }
    return -1;
  }
  
  address VMError::get_resetted_sighandler(int sig) {
    for (int i = 0; i < NUM_SIGNALS; i++) {
      if (SIGNALS[i] == sig) {
        return resettedSighandler[i];
      }
    }
    return NULL;
  }
  
  static void crash_handler(int sig, siginfo_t* info, void* ucVoid) {
+ 
    // Unmask current signal.
    sigset_t newset;
    sigemptyset(&newset);
    sigaddset(&newset, sig);
+   // and all other synchronous signals too.
+   for (int i = 0; i < NUM_SIGNALS; i++) {
+     sigaddset(&newset, SIGNALS[i]);
+   }
+   sigthreadmask(SIG_UNBLOCK, &newset, NULL);
  
!   VMError err(NULL, sig, NULL, info, ucVoid);
!   err.report_and_die();
  }
  
  void VMError::reset_signal_handlers() {
    sigset_t newset;
    sigemptyset(&newset);