Re: OpenJDK in core-updates

[Andreas Enge]

Next problem, hopefully fixed by the following patch:

diff -u -r openjdk-9.alt/hotspot/test/runtime/StackGuardPages/exeinvoke.c 
openjdk-9/hotspot/test/runtime/StackGuardPages/exeinvoke.c
--- openjdk-9.alt/hotspot/test/runtime/StackGuardPages/exeinvoke.c      
2023-04-05 13:46:58.689964892 +0200
+++ openjdk-9/hotspot/test/runtime/StackGuardPages/exeinvoke.c  2023-04-05 
14:15:52.435613325 +0200
@@ -67,8 +67,17 @@
   longjmp(context, 1);
 }

+static char* altstack = NULL;
+
 void set_signal_handler() {
-  static char altstack[SIGSTKSZ];
+  if (altstack == NULL) {
+    // Dynamically allocated in case SIGSTKSZ is not constant
+    altstack = (char*)malloc(SIGSTKSZ);
+    if (altstack == NULL) {
+      fprintf(stderr, "Test ERROR. Unable to malloc altstack space\n");
+      exit(7);
+    }
+  }

   stack_t ss = {
     .ss_size = SIGSTKSZ,

This is related to a change in glibc, and we have seen it in other places.
It is not new, so I do not quite understand how openjdk@9 compiled a few
weeks ago on core-updates and suddenly stopped to compile. At least openjdk@10
is also affected, and maybe later versions.

Andreas