Use free instead of xfree to free altstack

The altstack memory of a thread may be free'ed even after the VM is
destructed. After that, GC is no longer available, so calling xfree
may lead to a segfault.

This changeset uses the bare free function to free the altstack memory
instead of xfree. [Bug #18126]

1 files changed, 1 insertions, 1 deletions

diff --git a/vm_core.h b/vm_core.h
index 5db3080b43..2962356212 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -136,7 +136,7 @@
 void *rb_allocate_sigaltstack(void);
 void *rb_register_sigaltstack(void *);
 #  define RB_ALTSTACK_INIT(var, altstack) var = rb_register_sigaltstack(altstack)
-#  define RB_ALTSTACK_FREE(var) xfree(var)
+#  define RB_ALTSTACK_FREE(var) free(var)
 #  define RB_ALTSTACK(var)  var
 #else /* noop */
 #  define RB_ALTSTACK_INIT(var, altstack)