my webapp is crashing the JVM intermittently

Hello,
I have just pushed a new version of my web app to my production boxes .
which is apache-tomcat-5.5.15 with apache and fedora core 4

I am running this same app one 3 different boxes

on two of them it has crashed the JVM. The only reason i say this, is
because it probably rules out hardware

1 box crashes every 2 or 3 days and the other 1 once in the last week

I will give you a part of the log file of the crash.

if there is more that i can provide please let me know.

Any help would be really appreciated:
=====================================

#
# An unexpected error has been detected by HotSpot Virtual Machine:
#
#  SIGSEGV (0xb) at pc=0xb7a5e650, pid=18291, tid=1847487408
#
# Java VM: Java HotSpot(TM) Server VM (1.5.0_06-b05 mixed mode)
# Problematic frame:
# V  [libjvm.so+0x466650]
#

---------------  T H R E A D  ---------------

Current thread (0x099aedf8):  GCTaskThread [id=18292]

siginfo:si_signo=11, si_errno=0, si_code=1, si_addr=0x18181824

Registers:
EAX=0x18181818, EBX=0xb7ba37f0, ECX=0xab774708, EDX=0x18181820
ESP=0x6e1e60b0, EBP=0x6e1e6128, ESI=0xaf4c9fb4, EDI=0xaf4d23e8
EIP=0xb7a5e650, CR2=0x18181824, EFLAGS=0x00010293

Top of Stack: (sp=0x6e1e60b0)
0x6e1e60b0:   099a4050 00001004 b7b8e1ac b7a5e630
0x6e1e60c0:   099a4068 b7b96ac0 00000001 b7ba37f0
0x6e1e60d0:   823db790 823b38e0 6e1e6118 b7ba37f0
0x6e1e60e0:   00000006 00000000 18181818 00000000
0x6e1e60f0:   0000000c 00000000 00000001 af4d2398
0x6e1e6100:   af4d2258 00001000 af4c8730 b7839ef1
0x6e1e6110:   af4aa1e8 00001000 6e1e6188 b7ba37f0
0x6e1e6120:   af4c9fb4 af4d23e8 6e1e6168 b783a00c

Instructions: (pc=0xb7a5e650)
0xb7a5e640:   8b 4d 0c c7 45 bc 00 00 00 00 8b 41 04 8d 50 08
0xb7a5e650:   8b 4a 04 89 4d b8 85 c9 0f 8e f2 04 00 00 8b 45

Stack: [0x6e166000,0x6e1e7000),  sp=0x6e1e60b0,  free space=512k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V  [libjvm.so+0x466650]
V  [libjvm.so+0x24200c]
V  [libjvm.so+0x466471]
V  [libjvm.so+0x468862]
V  [libjvm.so+0x2094cf]
V  [libjvm.so+0x424338]
C  [libpthread.so.0+0x5bd4]

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\snipped\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

VM Arguments:
jvm_args: -Xms256m -Xmx1024m -Djava.awt.headless=true
-Dfile.encoding=ISO-8859-1
-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
 -Djava.util.logging.config.file=/usr/java/jakarta-tomcat/conf/logging.properties
-Djava.endorsed.dirs=/usr/java/jakarta-tomcat/common/endorsed -D
catalina.base=/usr/java/jakarta-tomcat
-Dcatalina.home=/usr/java/jakarta-tomcat
-Djava.io.tmpdir=/usr/java/jakarta-tomcat/temp
java_command: org.apache.catalina.startup.Bootstrap start start
Launcher Type: SUN_STANDARD

Environment Variables:
JAVA_HOME=/usr/java/jdk1.5.0_06
CLASSPATH=:/usr/java/jakarta-tomcat/bin/bootstrap.jar:/usr/java/jakarta-tomcat/bin/commons-logging-api.jar
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/java/jdk1.5.0_06/bin:/usr/java/jdk1.5.0_06
LD_LIBRARY_PATH=/usr/java/jdk1.5.0_06/jre/lib/i386/server:/usr/java/jdk1.5.0_06/jre/lib/i386:/usr/java/jdk1.5.0_06/jre/../lib/i386
SHELL=/bin/bash

Signal Handlers:
SIGSEGV: [libjvm.so+0x4fd530], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004
SIGBUS: [libjvm.so+0x4fd530], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004
SIGFPE: [libjvm.so+0x422860], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004
SIGPIPE: [libjvm.so+0x422860], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004
SIGILL: [libjvm.so+0x422860], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004
SIGUSR1: SIG_DFL, sa_mask[0]=0x00000000, sa_flags=0x00000000
SIGUSR2: [libjvm.so+0x424bb0], sa_mask[0]=0x00000000, sa_flags=0x10000004
SIGHUP: [libjvm.so+0x4245e0], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004
SIGINT: SIG_IGN, sa_mask[0]=0x00000000, sa_flags=0x00000000
SIGQUIT: [libjvm.so+0x4245e0], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004
SIGTERM: [libjvm.so+0x4245e0], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004


---------------  S Y S T E M  ---------------

OS:Fedora Core release 4 (Stentz)

uname:Linux 2.6.17-1.2142_FC4smp #1 SMP Tue Jul 11 22:57:02 EDT 2006 i686
libc:glibc 2.3.6 NPTL 2.3.6
rlimit: STACK 10240k, CORE 0k, NPROC 32750, NOFILE 1024, AS infinity
load average:0.31 0.21 0.20

CPU:total 2 family 47, cmov, cx8, fxsr, mmx, sse, sse2, ht

Memory: 4k page, physical 506k(14k free), swap 625k(625k free)

vm_info: Java HotSpot(TM) Server VM (1.5.0_06-b05) for linux-x86,
built on Nov 10 2005 10:56:33 by java_re with gcc 3.2.1-7a (J2SE
release)