It looks like the removal of the HPI in 6348631 has broken the large file support on Solaris in jdk7-b123. With hs20-b04 it is no longer possible to use java.io.FileInputStream, FileOutputStream or RandomAccessFile to open files >2GB. Other operations that cause the file to grow to larger than 2GB are also impacted.

I've only briefly looked at the issue but it seems to be that os::open is using ::open rather than ::open64.

Here are some of the regression tests that are failing:

jdk/test/java/io/FileInputStream/LargeFileAvailable.java
java.io.FileNotFoundException: /var/tmp/largefile1592599311387224322.tmp (Value too large for defined data type)
        at java.io.FileInputStream.open(Native Method)
        at java.io.FileInputStream.<init>(FileInputStream.java:137)
        at LargeFileAvailable.main(LargeFileAvailable.java:40)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:613)
        at com.sun.javatest.regtest.MainAction$SameVMThread.run(MainAction.java:575)
        at java.lang.Thread.run(Thread.java:732)

jdk/test/java/io/File/SetLastModified.java
java.io.IOException: File too large
        at sun.nio.ch.FileDispatcherImpl.write0(Native Method)
        at sun.nio.ch.FileDispatcherImpl.write(FileDispatcherImpl.java:59)
        at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:90)
        at sun.nio.ch.IOUtil.write(IOUtil.java:61)
        at sun.nio.ch.FileChannelImpl.write(FileChannelImpl.java:193)
        at SetLastModified.main(SetLastModified.java:109)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:613)
        at com.sun.javatest.regtest.MainAction$SameVMThread.run(MainAction.java:575)
        at java.lang.Thread.run(Thread.java:732)

test/java/nio/channels/FileChannel/Size.java fails with:
Exception in thread "main" java.io.IOException: File too large
        at sun.nio.ch.FileDispatcherImpl.truncate0(Native Method)
        at sun.nio.ch.FileDispatcherImpl.truncate(FileDispatcherImpl.java:79)
        at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:814)
        at Size.test2(Size.java:79)
        at Size.main(Size.java:48)

test/java/nio/channels/FileChannel/Transfer.java fails with:
java.io.FileNotFoundException: /var/tmp/blah6957361226591087591.tmp (Value too large for defined data type)
        at java.io.FileInputStream.open(Native Method)
        at java.io.FileInputStream.<init>(FileInputStream.java:137)
        at Transfer.xferTest04(Transfer.java:247)
        at Transfer.main(Transfer.java:54)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:613)
        at com.sun.javatest.regtest.MainAction$SameVMThread.run(MainAction.java:575)
        at java.lang.Thread.run(Thread.java:732)