Current jcstress uses JNA for affinity setup. It causes lots of warnings when running with JDK 25:

.......... [OK] o.o.j.t.fences.UnfencedDekkerTest
                            
  Scheduling class:
    actor1: package group 0, core group 0
    actor2: package group 0, core group 0

  CPU allocation:
    actor1: CPU #3 (package #0, core #3, thread #3)
    actor2: CPU #19 (package #0, core #3, thread #19)

  Compilation: split
    actor1: C2
    actor2: Interpreter

  JVM args: []
  Fork: #1

  RESULT SAMPLES FREQ EXPECT DESCRIPTION
    0, 0 25,430 0.04% Interesting Acceptable with no sequential consistency enforced
    0, 1 57,473,597 99.55% Acceptable Acceptable under sequential consistency
    1, 0 226,752 0.39% Acceptable Acceptable under sequential consistency
    1, 1 5,312 <0.01% Acceptable Acceptable under sequential consistency

  VM error stream:
    WARNING: A restricted method in java.lang.System has been called
    WARNING: java.lang.System::load has been called by com.sun.jna.Native in an unnamed module (file:/home/shade/trunks/shipilev-jcstress/tests-custom/target/jcstress.jar)
    WARNING: Use --enable-native-access=ALL-UNNAMED to avoid a warning for callers in this module
    WARNING: Restricted methods will be blocked in a future release unless native access is enabled