PIT b65: many regression tests failed with linux-amd64 build on 2.6 kernel linux machine

System config.
Mustang PIT b65, Regression tests on linux-amd64 build on "amd-susew" and "sqe-iteam-7"
(both systems are linux 2.6 kernel)

Symptom:
There are around 32 j2se regression tests failed on linux 2.6 kernel system (amd-susew) with linux-amd64 build.
Looking at more than 10 of the test failures, they are all failing with:
"Server exception: java.io.IOException: Bad file descriptor"
This message is coming from the HttpServer in
/test/sun/net/www/httptest

QE has tested sqe functional tests JHttp related by using the following build:
   /net/mho.sfbay/u/pit/b65/linux-amd64/346c/j2sdk1.6.0
         sqe-iteam-7 j2sdk1.6.0/bin> ./java -version
        java version "1.6.0-auto"
       Java(TM) 2 Runtime Environment, Standard
Edition (build 1.6.0-auto-346c)
     Java HotSpot(TM) 64-Bit Server VM (build
1.6.0-rc-b63, mixed mode)
And all tests are passing.

But many tests have failed when the following PIT build used:
/.automount/mho.sfbay/root/u/pit/b65/linux-amd64/jdk1.6.0/bin
sqe-iteam-7 jdk1.6.0/bin> ./java -version
java version "1.6.0-auto"
Java(TM) 2 Runtime Environment, Standard Edition
(build 1.6.0-auto-347)
Java HotSpot(TM) 64-Bit Server VM (build
1.6.0-rc-b63, mixed mode)

Comments from Dev.:
"FWIW, the issue arose on the 2.6 kernel and happened with 32-bit too. I
assume the linux-i586 testing was on a 2.4 kernel so the issue wasn't
noticed (as always we just have too many configurations to test :-)
-Alan"

A respin is on the way.