--- old/src/hotspot/share/utilities/vmError.cpp	2018-09-27 17:31:00.213583943 +0530
+++ new/src/hotspot/share/utilities/vmError.cpp	2018-09-27 17:31:00.089583943 +0530
@@ -58,6 +58,10 @@
 #include <signal.h>
 #endif // PRODUCT
 
+bool VMError::_vfork_mode = false;
+
+bool VMError::is_forkmode_vfork() { return _vfork_mode; }
+
 bool VMError::_error_reported = false;
 
 // call this when the VM is dying--it might loosen some asserts
@@ -1565,11 +1569,15 @@
 #endif
     tty->print_cr("\"%s\"...", cmd);
 
+    VMError::_vfork_mode = true;
+
     if (os::fork_and_exec(cmd) < 0) {
       tty->print_cr("os::fork_and_exec failed: %s (%s=%d)",
                      os::strerror(errno), os::errno_name(errno), errno);
     }
   }
+
+  VMError::_vfork_mode = false;
 }
 
 void VMError::report_java_out_of_memory(const char* message) {