Many JCK test fails:
lang/LEX/lex015/lex01591m42/lex01591m42.html
lang/LEX/lex015/lex01591m42_1/lex01591m42_1.html
lang/LEX/lex015/lex01591m42_2/lex01591m42_2.html
lang/LEX/lex015/lex01591m43_1/lex01591m43_1.html
lang/LEX/lex015/lex01591m43_2/lex01591m43_2.html
lang/LEX/lex015/lex01591m44_1/lex01591m44_1.html
lang/LEX/lex015/lex01591m44_2/lex01591m44_2.html
lang/LEX/lex015/lex01591m45_1/lex01591m45_1.html
lang/LEX/lex015/lex01591m45_2/lex01591m45_2.html
lang/LEX/lex015/lex01591m46_1/lex01591m46_1.html
lang/LEX/lex015/lex01591m46_2/lex01591m46_2.html
lang/LEX/lex015/lex01591m47_1/lex01591m47_1.html
lang/LEX/lex015/lex01591m47_2/lex01591m47_2.html
lang/LEX/lex015/lex01591m48_1/lex01591m48_1.html
lang/LEX/lex015/lex01591m48_2/lex01591m48_2.html
lang/LEX/lex015/lex01591m49_1/lex01591m49_1.html
lang/LEX/lex015/lex01591m49_2/lex01591m49_2.html
lang/LEX/lex015/lex01591m50_1/lex01591m50_1.html
lang/LEX/lex015/lex01591m50_2/lex01591m50_2.html
lang/LEX/lex015/lex01591m51/lex01591m51.html
lang/LEX/lex015/lex01591m42/lex01591m42.html
lang/LEX/lex015/lex01591ma2/lex01591ma2.html
lang/STMT/stmt034/stmt03407/stmt03407.html
lang/STMT/stmt034/stmt03408/stmt03408.html

These hangs javac b94.
Some of them are checked on earlier builds. Problem occured in b91.

Simple example:
Test.java
public interface Test {
    void m() {
       int case;
    }
}

Compiling it with JDK b90 we get:
Test.java:3: not a statement
       int case;
       ^
Test.java:3: ';' expected
       int case;
          ^
2 errors

Compiling it with JDK b91 we get
Test.java:3: not a statement
       int case;
       ^
Test.java:3: ';' expected
       int case;
          ^
Test.java:3: orphaned case
       int case;
           ^
and javac hangs.