* corelow.c (core_open): Flush the register cache before doing

anything with registers.

gdb/ChangeLog

@@ -1,3 +1,8 @@
+2009-05-18  Pedro Alves  <pedro@codesourcery.com>
+
+	* corelow.c (core_open): Flush the register cache before doing
+	anything with registers.
+
 2009-05-18  Pedro Alves  <pedro@codesourcery.com>
 
 	* inflow.h (our_process_group): Remove declaration.

gdb/corelow.c

@@ -379,6 +379,14 @@ core_open (char *filename, int from_tty)
      from ST to MT.  */
   add_thread_silent (inferior_ptid);
 
+  /* Need to flush the register cache (and the frame cache) from a
+     previous debug session.  If inferior_ptid ends up the same as the
+     last debug session --- e.g., b foo; run; gcore core1; step; gcore
+     core2; core core1; core core2 --- then there's potential for
+     get_current_regcache to return the cached regcache of the
+     previous session, and the frame cache being stale.  */
+  registers_changed ();
+
   /* Build up thread list from BFD sections, and possibly set the
      current thread to the .reg/NN section matching the .reg
      section. */