The issue appeared on Vista (5342) when the regression test was executed for the first time on this platform. There are more details in the comments section.
* The issue is still reproducible on Windows Vista latest bit (5472).

* The machine used to reproduce the failures is 32bit Vista : vm-em64t-01

* Tests suites effected : & MM_REGRESSION & JDI_REGRESSION
* MM_REGRESSION Result pages : http://vmsqe.sfbay/weekly/mustang/results/1.6.0-rc-b92/ClientVM/WINDOWSVISTA/mixed/VM8/MM_REGRESSION-30-WEEKLYmtg-VM8-ClientVM-mixed-WINDOWSVISTA-2006-07-30-08-20-38/analysis.html#New_Failures
* JDI_REGRESSION : http://vmsqe.sfbay/weekly/mustang/results/1.6.0-rc-b92/ClientVM/WINDOWSVISTA/mixed/VM8/JDI_REGRESSION-28-WEEKLYmtg-VM8-ClientVM-mixed-WINDOWSVISTA-2006-07-28-12-02-14/analysis.html#New_Failures

Error messages :

----------System.err:(0/0)----------
result: Failed. Execution failed: Error invoking program `sh': java.io.IOException: CreateProcess: sh -c "TESTJAVAHOME=Y:/weekly/mustang/weeklyjdk/latest/windows-i586 SystemRoot=C:\\Windows PATH=C:/MKS/mksnt TESTVMOPTS=-client TESTSRC=X:\\backup\\UNIFIED-DTF\\DTWS\\suites\\JDI_REGRESSION\\testbase\\test\\com\\sun\\jdi TESTCLASSES=C:\\temp\\Work\\exec\\JDI_REGRESSION-28-WEEKLYmtg-VM8-ClientVM-mixed-WINDOWSVISTA-2006-07-28-12-02-14\\classes\\com\\sun\\jdi TESTJAVA=Y:/weekly/mustang/weeklyjdk/latest/windows-i586 sh X:\\backup\\UNIFIED-DTF\\DTWS\\suites\\JDI_REGRESSION\\testbase\\test\\com\\sun\\jdi\\ArrayLengthDumpTest.sh" error=87

* Also I have tried all the steps listed in the bug & have also relevant steps listed in http://j2se.sfbay.sun.com/web/bin/view/JCG/JCGvista#Gotchas_for_issues_on_Vista