For some reason I can't get a java server app started using a (normal) user account. It runs fine under root.

Code:
ookla@ookla.1-gb.net [~]# which java
/usr/bin/java
ookla@ookla.1-gb.net [~]# java -version
Picked up _JAVA_OPTIONS: -Xms20m -Xmx640m -XX:MinHeapFreeRatio=20 -XX:MaxHeapFreeRatio=40 -XX:NewSize=10m -XX:MaxNewSize=10m -XX:SurvivorRatio=6 -XX:TargetSurvivorRatio=80 -XX:+CMSClassUnloadingEnabled -XX:+CMSClassUnloadingEnabled
Error occurred during initialization of VM
Could not reserve enough space for object heap
*** glibc detected *** java: double free or corruption (out): 0xb7f53260 ***
======= Backtrace: =========
/lib/libc.so.6[0x6d1595]
/lib/libc.so.6(cfree+0x59)[0x6d19d9]
/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/jre/lib/i386/server/libjvm.so[0xf58471]
/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/jre/lib/i386/server/libjvm.so[0xf04bd2]
/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/jre/lib/i386/server/libjvm.so[0xf05905]
/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/jre/lib/i386/server/libjvm.so[0xf09cc4]
/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/jre/lib/i386/server/libjvm.so(JNI_CreateJavaVM+0x53)[0xcb9d03]
java(JavaMain+0x98)[0x804a068]
/lib/libpthread.so.0[0x7bb5ab]
/lib/libc.so.6(clone+0x5e)[0x739cfe]
======= Memory map: ========
00110000-00135000 r-xp 00000000 08:07 87964      /lib/libm-2.5.so
00135000-00136000 r--p 00024000 08:07 87964      /lib/libm-2.5.so
00136000-00137000 rw-p 00025000 08:07 87964      /lib/libm-2.5.so
00137000-00159000 r-xp 00000000 08:03 1707229    /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/jre/lib/i386/libjava.so
00159000-0015b000 rw-p 00022000 08:03 1707229    /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/jre/lib/i386/libjava.so
0015b000-00161000 r-xp 00000000 08:03 1707249    /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/jre/lib/i386/libzip.so
00161000-00162000 rw-p 00006000 08:03 1707249    /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/jre/lib/i386/libzip.so
00162000-0016b000 rwxp 00162000 00:00 0
0016b000-00222000 rwxp 0016b000 00:00 0
00222000-0022d000 r-xp 00000000 08:07 87966      /lib/libgcc_s-4.1.2-20080825.so.1
0022d000-0022e000 rw-p 0000a000 08:07 87966      /lib/libgcc_s-4.1.2-20080825.so.1
00334000-0033d000 r-xp 00000000 08:07 88585      /lib/libnss_files-2.5.so
0033d000-0033e000 r--p 00008000 08:07 88585      /lib/libnss_files-2.5.so
0033e000-0033f000 rw-p 00009000 08:07 88585      /lib/libnss_files-2.5.so
004c8000-004ce000 r-xp 00000000 08:03 1810292    /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/jre/lib/i386/native_threads/libhpi.so
004ce000-004cf000 rw-p 00006000 08:03 1810292    /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/jre/lib/i386/native_threads/libhpi.so
00528000-00534000 r-xp 00000000 08:03 1707248    /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/jre/lib/i386/libverify.so
00534000-00535000 rw-p 0000b000 08:03 1707248    /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/jre/lib/i386/libverify.so
0064a000-00664000 r-xp 00000000 08:07 87797      /lib/ld-2.5.so
00664000-00665000 r--p 00019000 08:07 87797      /lib/ld-2.5.so
00665000-00666000 rw-p 0001a000 08:07 87797      /lib/ld-2.5.so
00668000-007a7000 r-xp 00000000 08:07 87952      /lib/libc-2.5.so
007a7000-007a8000 ---p 0013f000 08:07 87952      /lib/libc-2.5.so
007a8000-007aa000 r--p 0013f000 08:07 87952      /lib/libc-2.5.so
007aa000-007ab000 rw-p 00141000 08:07 87952      /lib/libc-2.5.so
007ab000-007ae000 rw-p 007ab000 00:00 0
007b0000-007b2000 r-xp 00000000 08:07 87959      /lib/libdl-2.5.so
007b2000-007b3000 r--p 00001000 08:07 87959      /lib/libdl-2.5.so
007b3000-007b4000 rw-p 00002000 08:07 87959      /lib/libdl-2.5.so
007b6000-007c9000 r-xp 00000000 08:07 87974      /lib/libpthread-2.5.so
007c9000-007ca000 r--p 00013000 08:07 87974      /lib/libpthread-2.5.so
007ca000-007cb000 rw-p 00014000 08:07 87974      /lib/libpthread-2.5.so
007cb000-007cd000 rw-p 007cb000 00:00 0
007cf000-007d2000 r-xp 00000000 08:03 1707270    /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/jre/lib/i386/jli/libjli.so
007d2000-007d3000 rw-p 00003000 08:03 1707270    /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/jre/lib/i386/jli/libjli.so
007f8000-0080a000 r-xp 00000000 08:03 1510122    /usr/lib/libz.so.1.2.3
0080a000-0080b000 rw-p 00011000 08:03 1510122    /usr/lib/libz.so.1.2.3
0080d000-00814000 r-xp 00000000 08:07 87976      /lib/librt-2.5.so
00814000-00815000 r--p 00006000 08:07 87976      /lib/librt-2.5.so
00815000-00816000 rw-p 00007000 08:07 87976      /lib/librt-2.5.so
0094e000-00961000 r-xp 00000000 08:07 87989      /lib/libnsl-2.5.so
00961000-00962000 r--p 00012000 08:07 87989      /lib/libnsl-2.5.so
00962000-00963000 rw-p 00013000 08:07 87989      /lib/libnsl-2.5.so
00963000-00965000 rw-p 00963000 00:00 0
009b0000-009b1000 r-xp 009b0000 00:00 0          [vdso]
009b1000-00fb6000 r-xp 00000000 08:03 1810339    /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/jre/lib/i386/server/libjvm.so
00fb6000-01001000 rw-p 00604000 08:03 1810339    /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/jre/lib/i386/server/libjvm.so
01001000-01421000 rw-p 01001000 00:00 0
03012000-03252000 rwxp 03012000 00:00 0
03252000-06012000 rwxp 03252000 00:00 0
08048000-08051000 r-xp 00000000 08:03 1707175    /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/jre/bin/java
08051000-08053000 rw-p 00008000 08:03 1707175    /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/jre/bin/java
097f2000-09813000 rw-p 097f2000 00:00 0          [heap]
b7f03000-b7f06000 ---p b7f03000 00:00 0
b7f06000-b7f56000 rw-p b7f06000 00:00 0
b7f57000-b7f5f000 rw-s 00000000 08:06 117000     /tmp/hsperfdata_ookla/21936 (deleted)
b7f5f000-b7f60000 rw-p b7f5f000 00:00 0
b7f60000-b7f61000 r--p b7f60000 00:00 0
b7f61000-b7f62000 rw-p b7f61000 00:00 0
bfa20000-bfa35000 rw-p bffea000 00:00 0          [stack]
Aborted (core dumped)
FAILS!
But, as root:
Code:
root@svr2 [/home2/ookla]# java -version
java version "1.6.0"
OpenJDK  Runtime Environment (build 1.6.0-b09)
OpenJDK Server VM (build 1.6.0-b09, mixed mode)
Anyone have any ideas on how to fix this?

Running RHEL5 with WHM/cPanel loaded on top.

HELP!