1 files changed, 5 insertions, 2 deletions
diff --git a/thread.c b/thread.c
index 8953c270bb..df583266eb 100644
--- a/thread.c
+++ b/thread.c
@@ -599,8 +599,11 @@ thread_cleanup_func_before_exec(void *th_ptr)
     // The thread stack doesn't exist in the forked process:
     th->ec->machine.stack_start = th->ec->machine.stack_end = NULL;
 
-    // The vm_stack is `alloca`ed on the thread stack, so it's gone too:
-    rb_ec_clear_vm_stack(th->ec);
+    // Appears to be causing a lot of issues.
+    if (0) {
+      // The vm_stack is `alloca`ed on the thread stack, so it's gone too:
+      rb_ec_clear_vm_stack(th->ec);
+    }
 }
 
 static void