The test JSR166TestCase.java contains multiple @run statements, but only the first one is executed!
(edit: only if the @run fails!)

This is a serious regression, because the test harness is silently failing to execute tests that have been running for years.

 $ grep @run < test/jdk/java/util/concurrent/tck/JSR166TestCase.java
 * @run junit/othervm/timeout=1000 JSR166TestCase
 * @run junit/othervm/timeout=1000 -Djava.security.manager=allow JSR166TestCase
 * @run junit/othervm/timeout=1000
 * @run junit/othervm/timeout=1000
 * @run junit/othervm/timeout=1000
 * @run junit/othervm/timeout=1000/policy=tck.policy

 $ jtreg -v:all -jdk ~/jdk/jdk21 test/jdk/java/util/concurrent/tck/JSR166TestCase.java |& grep 'REASON:.*run junit'
REASON: User specified action: run junit/othervm/timeout=1000 JSR166TestCase