Test which fills heap with different objects, and then dumps heap using jmap -dump:format=b fails intermittently with exception:
heapdump/JMapHeap
Here is the failure log:

Starting eating heap.
Executing /net/vmsqe.russia/export1/vmsqe/jdk-builds/latest/solaris-sparc/bin/jmap -dump:format=b,file=heap.bin 11004
Dumping heap to /net/vmsqe-amd-01.russia/export4/UTB/DTF-work/dtf3-exec/spb.nightly-2006-05-05-spb.nightly-Main_Baseline_checkjni-server-mixed-solaris-sparc
-ANYVENDOR-2006-05-05-02-02-04-0521/work/vmsqe-robot.SunOS.sparc/JMapHeap/heap.bin ...
Exception in thread "main" java.io.IOException: Unable to enqueue command to target VM: Internal error
        at sun.tools.attach.SolarisVirtualMachine.enqueue(Native Method)
        at sun.tools.attach.SolarisVirtualMachine.execute(SolarisVirtualMachine.java:107)
        at sun.tools.attach.HotSpotVirtualMachine.executeCommand(HotSpotVirtualMachine.java:195)
        at sun.tools.attach.HotSpotVirtualMachine.dumpHeap(HotSpotVirtualMachine.java:162)
        at sun.tools.jmap.JMap.dump(JMap.java:215)
        at sun.tools.jmap.JMap.main(JMap.java:120)
Java HotSpot(TM) Server VM warning: Unable to re-attach door
Java exited with exit status 1
TEST FAILED

Also, the warning appears each time the test is run.
See Comments for details on how to reproduce it.