UseParallelGC problem with 1.4.2_19 when running SPECjbb2000 v1.02 on Win/IA64

We're continuing to test Mantis Build 19 on IA64. We've run into a
problem with Parallel GC. We're running SPECjbb2000 v1.02 (for 32
warehouses) on a 16 way 1.2Ghz Itanium 3 (Madison) with 32Gb RAM.

The test completes if we do not use Parallel GC. If we use the
Parallel GC option with 8 PGC threads, the test crashes almost
immediately. If we use 4 PGC threads, the test crashes at warehouse
29.

I have attached the last few lines of our log for the 29 warehouse
crash (1.4.2_b19_crash.out). The command line used for this test was
as follows:


java -server -verbose:gc -Xmn2048m -Xms6144m -Xmx6144m -XX:+UseParallelGC
-XX:ParallelGCThreads=4 -XX:+UseTLAB -XX:TLABSize=512k -cp
.\jbb.jar;.\jbb_no_precompile.jar;.\check.jar;.\reporter.jar;.
spec.jbb.JBBmain -propfile SPECjbb.props

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Update for Mantic Build 20:

We ran our SPECjbb2000 test the other day with Mantis Build 20. We were
using the same command line as we normally do (as per the e-mail I sent
you about Mantis Build 19), with 8 PGC threads. The test failed at 17
warehouses. I have attached the output from the crash: 1.4.2_20_crash.out.
The test does complete if I use 4 PGC threads.