This is not regression. Isue exit since 1.4.2 FCS. nsk/jdi/ReferenceType/isInitialized/isinit001 tests cause intermittent 1.4.2 JVM crash when -Xconcgc used. The bug will mark these crashes as known issues.

[2010-03-30T17:36:48.89] # Actual: /export/jdk/j2sdk1.4.2_26/bin/java -d64 -Xconcgc nsk.jdi.ReferenceType.isInitialized.isinit001 -arch=sparcv9 -waittime=2 -debugee.vmkind=java "-debugee.vmkeys=-d64 -Xconcgc"
[2010-03-30T17:36:48.89] debugee.stdout> #
[2010-03-30T17:36:54.93] debugee.stdout> # An unexpected error has been detected by HotSpot Virtual Machine:
[2010-03-30T17:36:54.93] debugee.stdout> #
[2010-03-30T17:36:54.93] debugee.stdout> # SIGBUS (0xa) at pc=0xffffffff6ca13efc, pid=14280, tid=9
[2010-03-30T17:36:54.93] debugee.stdout> #
[2010-03-30T17:36:54.93] debugee.stdout> # Java VM: Java HotSpot(TM) 64-Bit Server VM (1.4.2_26-rev-b05 mixed mode)
[2010-03-30T17:36:54.93] debugee.stdout> # Problematic frame:
[2010-03-30T17:36:54.93] debugee.stdout> # C [libjdwp.so+0x13efc]
[2010-03-30T17:36:54.93] debugee.stdout> #
[2010-03-30T17:36:54.93] debugee.stdout> # An error report file with more information is saved as hs_err_pid14280.log
[2010-03-30T17:36:54.93] debugee.stdout> #
[2010-03-30T17:36:54.93] debugee.stdout> # If you would like to submit a bug report, please visit:
[2010-03-30T17:36:54.93] debugee.stdout> # http://java.sun.com/webapps/bugreport/crash.jsp
[2010-03-30T17:36:54.93] debugee.stdout> #