Description of problem:

Sigar can't grok the name of kernel threads. They appear like so in ps:

$ ps aux | grep 6073
root      6073  0.0  0.0      0     0 ?        S<   Aug12   0:00 [nfsd4]

This making it hard to monitor these. This seems to be a problem with Sigar itself not finding the data.

The data is available from the /proc directory on Linux.

$ cat /proc/6073/status  | grep Name
Name:   nfsd4

The test program shows this:

$ sudo java -cp /usr/local/rhq-agent/lib/sigar-1.6.5.132-5.jar:. Test 6073
exe org.hyperic.sigar.SigarFileNotFoundException: No such file or directory
[]
[{}]

Program:

import org.hyperic.sigar.*;
import java.util.*;

public class Test {
        public static void main(String args[]) throws Exception {
                long pid = new Long(args[0]);
                Sigar s = new Sigar();
try {
                System.out.println(s.getProcExe(pid));
} catch (Exception e) { System.out.println("exe " + e); }
try {
                System.out.println(Arrays.asList(s.getProcArgs(pid)));
} catch (Exception e) {}
try {
                System.out.println(Arrays.asList(s.getProcEnv(pid)));
} catch (Exception e) {}

        }
}

...

The solution is probably to patch Sigar, not sure on the procedure here.