RFR: 8210373: Deadlock in libj2gss.so when loading "j2gss" and "net" libraries in parallel.

[Xue-Lei Andrew Fan]

On Fri, 19 Feb 2021 21:44:15 GMT, Weijun Wang <weijun at openjdk.org> wrote:

> `InetAddress` is loading native library `net` and at the same time `SunNativeProvider` is loading `j2gss`, and in the `OnLoad` function inside `j2gss` it is calling `FindClass(env, "java/net/InetAddress")` and thus a deadlock.
> 
> We can access `InetAddress` in `SunNativeProvider.<clinit>` before loading the jgss library. i.e. use `Class.forName` to ensure `InetAddress` is initialized. Thanks to @dholmes-ora for providing this workaround.
> 
> No new regression test, hard to reproduce.

src/java.security.jgss/share/classes/sun/security/jgss/wrapper/SunNativeProvider.java line 74:

> 72:                             System.getProperty("sun.security.nativegss.debug"));
> 73:                         try {
> 74:                             Class.forName("java.net.InetAddress");

The returned value of Class.forName() is not used, someone else could delete this line later is he/she does not know the story behind this line.  Would you mind add a few line comments about why it is added?

Otherwise, looks good to me.

-------------

PR: https://git.openjdk.java.net/jdk/pull/2655