This may be operator error in not being intimately familiar with jtreg, but I tried to use the rerun string from a JTREG run.

My jtreg test includes (note the @modules line):

 * @library /lib/testlibrary
 * @library /java/security/modules
 * @modules java.base/jdk.internal.module
 * @build CompilerUtils JarUtils
 * @run testng TestJCEProviderModularTest

It failed with:

java.lang.IllegalAccessError: class ModularTest (in unnamed module @0x63a270c9) cannot access class jdk.internal.module.ModuleInfoWriter (in module java.base) because module java.base does not export jdk.internal.module to unnamed module @0x63a270c9

adding a:

% diff doit.sh doit-test.sh
25a26
> --add-exports java.base/jdk.internal.module=ALL-UNNAMED \

took care of the problem.

It does include:

        -Dtest.modules=java.base/jdk.internal.module \

but this doesn't seem to allow for the access.