Print errno when mprotect fails

Trying to figure out the problem on s390x.
ruby · Oct 20, 2021 · 472c97b · 472c97b
1 parent 82e2443
commit 472c97b
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/gc.c b/gc.c
@@ -4870,7 +4870,8 @@ lock_page_body(rb_objspace_t *objspace, struct heap_page_body *body)
 #else
     if (mprotect(body, HEAP_PAGE_SIZE, PROT_NONE)) {
 #endif
-        rb_bug("Couldn't protect page %p", (void *)body);
+        int pagesize = (int)sysconf(_SC_PAGE_SIZE);
+        rb_bug("Couldn't protect page %p, page size: %d errno: %s", (void *)body, pagesize, strerror(errno));
     }
     else {
         gc_report(5, objspace, "Protecting page in move %p\n", (void *)body);
@@ -4887,7 +4888,8 @@ unlock_page_body(rb_objspace_t *objspace, struct heap_page_body *body)
 #else
     if (mprotect(body, HEAP_PAGE_SIZE, PROT_READ | PROT_WRITE)) {
 #endif
-        rb_bug("Couldn't unprotect page %p", (void *)body);
+        int pagesize = (int)sysconf(_SC_PAGE_SIZE);
+        rb_bug("Couldn't unprotect page %p, page size: %d errno: %s", (void *)body, pagesize, strerror(errno));
     }
     else {
         gc_report(5, objspace, "Unprotecting page in move %p\n", (void *)body);