symbol.c: fix memory leak from global fstr hash

* symbol.c (rb_gc_free_dsymbol): delete from global fstr hash
* test/ruby/test_symbol.rb (test_symbol_fstr_leak): test for bug
  [ruby-core:67268] [Bug #10686]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49090 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 0 deletions

diff --git a/symbol.c b/symbol.c
index f067ebe3f9..1127020d17 100644
--- a/symbol.c
+++ b/symbol.c
@@ -664,6 +664,7 @@ rb_gc_free_dsymbol(VALUE sym)
     if (str) {
 	RSYMBOL(sym)->fstr = 0;
 	unregister_sym(str, sym);
+	rb_hash_delete_entry(global_symbols.dsymbol_fstr_hash, str);
     }
 }