1 files changed, 18 insertions, 0 deletions
diff --git a/thread.c b/thread.c
index 5ea198237..5caf1da4f 100644
--- a/thread.c
+++ b/thread.c
@@ -323,6 +323,7 @@ typedef struct rb_mutex_struct
 } mutex_t;
 
 static void rb_mutex_unlock_all(mutex_t *mutex, rb_thread_t *th);
+static void rb_mutex_abandon_all(mutex_t *mutexes);
 
 void
 rb_thread_terminate_all(void)
@@ -2724,6 +2725,10 @@ terminate_atfork_i(st_data_t key, st_data_t val, st_data_t current_th)
     GetThreadPtr(thval, th);
 
     if (th != (rb_thread_t *)current_th) {
+	if (th->keeping_mutexes) {
+	    rb_mutex_abandon_all(th->keeping_mutexes);
+	}
+	th->keeping_mutexes = NULL;
 	thread_cleanup_func(th);
     }
     return ST_CONTINUE;
@@ -3285,6 +3290,19 @@ rb_mutex_unlock_all(mutex_t *mutexes, rb_thread_t *th)
     }
 }
 
+static void
+rb_mutex_abandon_all(mutex_t *mutexes)
+{
+    mutex_t *mutex;
+
+    while (mutexes) {
+	mutex = mutexes;
+	mutexes = mutex->next_mutex;
+	mutex->th = 0;
+	mutex->next_mutex = 0;
+    }
+}
+
 static VALUE
 rb_mutex_sleep_forever(VALUE time)
 {