Steps to reproduce:
1. download nightly bundle
http://rehudson.us.oracle.com:8080/hudson/job/jdk8_deploy-1-prebuild/ws/bundles/linux-amd64/b255-2012-09-23_427/jre-8-ea-linux-x64.tar.gz
2. register it on firefox
3. open http://jfx.us.oracle.com/hudson/view/8.0/job/8.0/34/label=linux-amd64-30/artifact/artifacts/apps/ga-samples/BrickBreaker.html, after clicking link "click to launch this app as webstart", app can't be launched, and following javaws crash info is printed on terminal console.

*** glibc detected *** /export/local/javafamily/testjre/bin/javaws: malloc(): memory corruption: 0x00000000008be240 ***
======= Backtrace: =========
/lib/libc.so.6(+0x775b6)[0x7f3e3fb5e5b6]
/lib/libc.so.6(+0x7b6d8)[0x7f3e3fb626d8]
/lib/libc.so.6(__libc_malloc+0x6e)[0x7f3e3fb6358e]
/export/local/javafamily/testjre/bin/javaws[0x40e4cd]
/export/local/javafamily/testjre/bin/javaws[0x40719e]
/export/local/javafamily/testjre/bin/javaws[0x404103]
/lib/libc.so.6(__libc_start_main+0xfd)[0x7f3e3fb05c4d]
/export/local/javafamily/testjre/bin/javaws[0x402019]
======= Memory map: ========
00400000-00415000 r-xp 00000000 08:01 44962464 /export/local/javafamily/testjre/bin/javaws
00614000-00615000 rw-p 00014000 08:01 44962464 /export/local/javafamily/testjre/bin/javaws
00615000-0061f000 rw-p 00000000 00:00 0
008bc000-008dd000 rw-p 00000000 00:00 0 [heap]
7f3e38000000-7f3e38021000 rw-p 00000000 00:00 0