merges r20291 from trunk into ruby_1_9_1.

* vm.c (thread_free): th->vm may be NULL when pthread_create
  failed for ENOMEM.  [ruby-dev:37095]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@20322 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/vm.c b/vm.c
index 5bf684237e..2bb050d19e 100644
--- a/vm.c
+++ b/vm.c
@@ -1486,7 +1486,7 @@ thread_free(void *ptr)
 	}
 #endif
 
-	if (th->vm->main_thread == th) {
+	if (th->vm && th->vm->main_thread == th) {
 	    RUBY_GC_INFO("main thread\n");
 	}
 	else {