merge revision(s) 57595: [Backport #8996]

	check thread deadness correctly.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@57906 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 0 deletions

diff --git a/thread.c b/thread.c
index 9be300a26c..ee75ec39ee 100644
--- a/thread.c
+++ b/thread.c
@@ -2103,6 +2103,13 @@ rb_threadptr_raise(rb_thread_t *th, int argc, VALUE *argv)
     else {
 	exc = rb_make_exception(argc, argv);
     }
+
+    /* making an exception object can switch thread,
+       so we need to check thread deadness again */
+    if (rb_threadptr_dead(th)) {
+	return Qnil;
+    }
+
     rb_threadptr_setup_exception(GET_THREAD(), exc, Qundef);
     rb_threadptr_pending_interrupt_enque(th, exc);
     rb_threadptr_interrupt(th);