TransformerManagementThreadAddTests.java failed in the 2006.06.29 nightly.
Here is the entry from my usual analysis report:

New INSTRUMENT_REGRESSION failures (from 2006.06.29)
   java/lang/instrument/TransformerManagementThreadAddTests.java
        This test failed the following assertion:

            Internal Error (src/share/vm/opto/parse1.cpp, 1579)
            Error: assert(n != top() || r->in(pnum) == top(),
                "live value must not be garbage")

        on Solaris X86 Server VM (machine vm-v20z-9), Solaris SPARC
        Server VM (machine jtg-s130), Solaris SPARC-64 Server VM
        (machine jtg-s130), and Solaris AMD64 Server VM (machine
        vm-v20z-10). This is a client-centric day so these are the
        only Server VM configs to be run today.

        This failure did not occur in the 2006.06.28 run. PRT job
        20060629094817.dcubed.service_hs_b91_merge was a merge of
        20060629071936.nips.compiler_b91_merge from main/baseline.
        There were no other putbacks to service_hs_baseline. It
        looks like we picked up a regression for the c2_baseline
        push for Mustang-B91.

        This test is covered by the following bug:

            6239043 4/4 test/java/lang/instrument/
                        TransformerManagementThreadAddTests.java failed 

        However, this is not the same failure mode.
To reproduce this bug you need a JDK/SDK workspace. Actually you
just need the test portion of it, possibly even just the
test/java/lang/instrument portion of it, but I haven't tested
that.

I've attached a do-sdk-jli.ksh script that runs just the
TransformerManagementThreadAddTests.java test. Drop this
script at the top of the JDK/SDK workspace and run as
follows:

% ksh do-sdk-jli.ksh $JAVA_HOME -server
runregress: Version 01/14/06
runregress: Using jtreg 2.1.6 from /java/svc/jct-tools2.1.6
runregress: Using this jdk for JavaTest: /java/svc/sqeweb/UNIFIED-DTF/stable-jdk/solaris-sparc
runregress: Testing this jdk: /net/gtee/export/nightly/mustang/JDK/service_hs_baseline/jdk1.6/solaris-sparc

-- NOTE:  Will run jtreg with  -server -showversion
          jtreg might not like some/all of these!
          Run ..../jtreg -help for more info

Starting run:  Fri Jun 30 14:44:54 PDT 2006
Directory "/home/dcubed/sdk-test-mustang/sdk-jli.solaris-sparc/JTwork/scratch" not found: Creating
java version "1.5.0_05"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_05-b05)
Java HotSpot(TM) Client VM (build 1.5.0_05-b05, mixed mode)

test results: failed: 1
Report written to /home/dcubed/sdk-test-mustang/sdk-jli.solaris-sparc/JTreport/report.html
Results written to /home/dcubed/sdk-test-mustang/sdk-jli.solaris-sparc/JTwork
Error: some tests failed or other problems occurred

real     1:34.4
user     1:02.0
sys         9.1

The summary report is in:
   /home/dcubed/sdk-test-mustang/sdk-jli.solaris-sparc/jjsummary.html

Failed tests are:
runner finished: java/lang/instrument/TransformerManagementThreadAddTests.java: Failed. Unexpected exit from test [exit code: 6]

cat /home/dcubed/sdk-test-mustang/sdk-jli.solaris-sparc/JTwork/java/lang/instrument/TransformerManagementThreadAddTests.jtr


% tail -25 sdk-jli.solaris-sparc/JTwork/java/lang/instrument/TransformerManagementThreadAddTests.jtr
----------System.out:(19/931)----------
InstrumentationHandoff JPLIS agent initialized
Reading test class from /home/dcubed/sdk-test-mustang/sdk-jli.solaris-sparc/JTwo
rk/classes/java/lang/instrument/DummyClass.class
# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc:  SuppressErrorAt=/parse1.cpp:1579]
#
# An unexpected error has been detected by Java Runtime Environment:
#
#  Internal Error (/net/prt-solsparc-q1-18/tmp/PrtBuildDir/workspace/src/share/v
m/opto/parse1.cpp, 1579 [ Patched ]), pid=22468, tid=7
#
# Java VM: Java HotSpot(TM) Server VM (20060629094817.dcubed.service_hs_b91_merg
e-debug mixed mode)
#
# Error: assert(n != top() || r->in(pnum) == top(),"live value must not be garba
ge")
# An error report file with more information is saved as hs_err_pid22468.log
#
# If you would like to submit a bug report, please visit:
#   http://java.sun.com/webapps/bugreport/crash.jsp
#
Current thread is 7
Dumping core ...
----------System.err:(0/0)----------
result: Failed. Unexpected exit from test [exit code: 6]


test result: Failed. Unexpected exit from test [exit code: 6]

Feel free to use ~dcubed/sdk-test-mustang and the do-sdk-jli.ksh
file that I left there.