jtools do not list VM process launched with the debugger option suspend=y

The jcmd, jps, jinfo, jmap and jstack do not list the VM processes launched with the debugger option suspend=y

Please, find the debuggerattach.jar in the bug report attachments.

1) Run the following command in one Terminal:

% /java/re/jdk/9/promoted/latest/binaries/linux-x64/bin/java -cp debuggerattach.jar -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5900
Listening for transport dt_socket at address: 5900

2) In another terminal:

% ps -ef | g debuggerattach
sspitsyn 28995 28282 0 14:20 pts/0 00:00:00 /java/re/jdk/9/promoted/latest/binaries/linux-x64/bin/java -cp debuggerattach.jar -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5900

% /java/re/jdk/9/promoted/latest/binaries/linux-x64/bin/jcmd -l
27015 jdk.jcmd/sun.tools.jcmd.JCmd -l

The process 28995 was not listed above.
The same issue exist for other jtools like jps, jinfo, jmap and jstack.

This is a comment from Robbin Ehn:

It is the AttachProvider that don't see the VM when you have "suspend=y".
So jcmd never get it at all.

E.g. if you are running this code:
    public static void main(String[] args) {
        List<VirtualMachineDescriptor> vmds = com.sun.tools.attach.VirtualMachine.list();
        for (VirtualMachineDescriptor vmd : vmds) {
            System.out.println(vmd);
        }
    }
It's not listed as long as it's suspended.

Adding some tracing allows to see this:

$BIN/jcmd -l
MYTRACE: listVirtualMachines: next pid: 31240
MYTRACE: listVirtualMachines: Exception for pid: 31240
sun.jvmstat.monitor.MonitorException: Could not synchronize with target
at jdk.internal.jvmstat/sun.jvmstat.perfdata.monitor.v2_0.PerfDataBuffer.synchWithTarget(PerfDataBuffer.java:274)
at jdk.internal.jvmstat/sun.jvmstat.perfdata.monitor.v2_0.PerfDataBuffer.buildMonitorMap(PerfDataBuffer.java:132)
at jdk.internal.jvmstat/sun.jvmstat.perfdata.monitor.PerfDataBufferImpl.findByName(PerfDataBufferImpl.java:242)
at jdk.internal.jvmstat/sun.jvmstat.perfdata.monitor.AbstractPerfDataBuffer.findByName(AbstractPerfDataBuffer.java:99)
at jdk.internal.jvmstat/sun.jvmstat.perfdata.monitor.AbstractMonitoredVm.findByName(AbstractMonitoredVm.java:82)
at jdk.internal.jvmstat/sun.jvmstat.monitor.MonitoredVmUtil.isAttachable(MonitoredVmUtil.java:181)
at jdk.attach/sun.tools.attach.HotSpotAttachProvider.listVirtualMachines(HotSpotAttachProvider.java:95)
at jdk.attach/com.sun.tools.attach.VirtualMachine.list(VirtualMachine.java:146)
at jdk.jcmd/sun.tools.common.ProcessArgumentMatcher.getVMDs(ProcessArgumentMatcher.java:131)
at jdk.jcmd/sun.tools.common.ProcessArgumentMatcher.getVirtualMachineDescriptors(ProcessArgumentMatcher.java:144)
at jdk.jcmd/sun.tools.common.ProcessArgumentMatcher.getVirtualMachineDescriptors(ProcessArgumentMatcher.java:149)
at jdk.jcmd/sun.tools.jcmd.JCmd.main(JCmd.java:77)
MYTRACE: listVirtualMachines: next pid: 16893
16893 jdk.jcmd/sun.tools.jcmd.JCmd -l