diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 2b7e5313a49..6dade07dc5b 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2011-04-20  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/48611
+	* tree-eh.c (note_eh_region_may_contain_throw): Don't propagate
+	beyond ERT_MUST_NOT_THROW region.
+
 2011-04-20  Catherine Moore  <clm@codesourcery.com>
 
 	* config/mips/mips.opt (mfix-24k): New.
diff --git a/gcc/tree-eh.c b/gcc/tree-eh.c
index 5ef319dc2ca..76453b8f45a 100644
--- a/gcc/tree-eh.c
+++ b/gcc/tree-eh.c
@@ -849,6 +849,8 @@ note_eh_region_may_contain_throw (eh_region region)
 {
   while (bitmap_set_bit (eh_region_may_contain_throw_map, region->index))
     {
+      if (region->type == ERT_MUST_NOT_THROW)
+	break;
       region = region->outer;
       if (region == NULL)
 	break;