diff -r 4a9cc99938e3 -r a2ea687fdc7c src/share/vm/utilities/vmError.cpp
--- a/src/share/vm/utilities/vmError.cpp	Fri Mar 26 11:10:26 2010 -0400
+++ b/src/share/vm/utilities/vmError.cpp	Wed Mar 31 16:51:18 2010 -0700
@@ -807,8 +807,8 @@
       if (fd == -1) {
         // try temp directory
         const char * tmpdir = os::get_temp_directory();
-        jio_snprintf(buffer, sizeof(buffer), "%shs_err_pid%u.log",
-                     (tmpdir ? tmpdir : ""), os::current_process_id());
+        jio_snprintf(buffer, sizeof(buffer), "%s%shs_err_pid%u.log",
+                     tmpdir, os::file_separator(), os::current_process_id());
         fd = open(buffer, O_WRONLY | O_CREAT | O_TRUNC, 0666);
       }