getting lots of java core files after upgrading to FC3

[Brian Mury]

I've been getting a large number of core files in my home directory
after upgrading from FC2 to FC3. Bug Buddy says these are from java.
Java applets run fine. I haven't noticed java (or anything else)
crashing. I just a whole pile of core files. They seem to come in groups
with similar timestamps. 

Has anybody else experienced this? Fixes? Help with figuring out what is
causing it? 

Here's the backtrace from Bug Buddy.

Backtrace was generated from '/usr/java/j2re1.4.2_05/plugin/i386/ns610-
gcc32/../../../bin//java'

(no debugging symbols found)...Using host libthread_db library
"/lib/tls/libthread_db.so.1".
(no debugging symbols found)...Core was generated by
`/usr/java/j2re1.4.2_05/plugin/i386/ns610-gcc32/../../../bin//java -
version'.
Program terminated with signal 11, Segmentation fault.
(no debugging symbols found)...(no debugging symbols found)...(no
debugging symbols found)...(no debugging symbols found)...#0  0x44038f38
in ?? ()
#0  0x44038f38 in ?? ()
#1  0xbfffbff8 in ?? ()
#2  0x4a13df48 in ?? ()
#3  0xbfffc02c in ?? ()
#4  0x4a13e4b0 in ?? ()
#5  0x00000000 in ?? ()

Thread 5 (process 16216):
#0  0x4012abaa in poll () from /lib/libc.so.6
No symbol table info available.
#1  0x400204d0 in __pthread_manager () from /lib/libpthread.so.0
No symbol table info available.
#2  0x401347da in clone () from /lib/libc.so.6
No symbol table info available.

Thread 4 (process 16217):
#0  0x40027d26 in nanosleep () from /lib/libpthread.so.0
No symbol table info available.
#1  0x00000000 in ?? ()
No symbol table info available.

Thread 3 (process 16218):
#0  0x40023254 in __pthread_sigsuspend () from /lib/libpthread.so.0
No symbol table info available.
#1  0x400227a8 in __pthread_wait_for_restart_signal ()
   from /lib/libpthread.so.0
No symbol table info available.
#2  0x4001f1b2 in pthread_cond_wait at GLIBC_2.0 ()
from /lib/libpthread.so.0
No symbol table info available.
#3  0x403f0ced in os::Linux::safe_cond_wait ()
   from /usr/java/j2re1.4.2_05/lib/i386/client/libjvm.so
No symbol table info available.
#4  0x403e9ffe in ObjectMonitor::wait ()
   from /usr/java/j2re1.4.2_05/lib/i386/client/libjvm.so
No symbol table info available.
#5  0x4041fcd7 in ObjectSynchronizer::wait ()
   from /usr/java/j2re1.4.2_05/lib/i386/client/libjvm.so
No symbol table info available.
#6  0x4038bfd6 in JVM_MonitorWait ()
   from /usr/java/j2re1.4.2_05/lib/i386/client/libjvm.so
No symbol table info available.
#7  0x44039cb2 in ?? ()
No symbol table info available.
#8  0x08092ee0 in ?? ()
No symbol table info available.
#9  0xbf5ff7e0 in ?? ()
No symbol table info available.
#10 0x00000000 in ?? ()
No symbol table info available.

Thread 2 (process 16219):
#0  0x4013123d in mmap () from /lib/libc.so.6
No symbol table info available.
#1  0x403f1b47 in os::commit_memory ()
   from /usr/java/j2re1.4.2_05/lib/i386/client/libjvm.so
No symbol table info available.
#2  0x4043b994 in JavaThread::create_stack_guard_pages ()
   from /usr/java/j2re1.4.2_05/lib/i386/client/libjvm.so
No symbol table info available.
#3  0x40437525 in JavaThread::run ()
   from /usr/java/j2re1.4.2_05/lib/i386/client/libjvm.so
No symbol table info available.
#4  0x403f2ba3 in _start ()
   from /usr/java/j2re1.4.2_05/lib/i386/client/libjvm.so
No symbol table info available.
#5  0x4001ff6b in pthread_start_thread () from /lib/libpthread.so.0
No symbol table info available.
#6  0x401347da in clone () from /lib/libc.so.6
No symbol table info available.

Thread 1 (process 16212):
#0  0x44038f38 in ?? ()
No symbol table info available.
#1  0xbfffbff8 in ?? ()
No symbol table info available.
#2  0x4a13df48 in ?? ()
No symbol table info available.
#3  0xbfffc02c in ?? ()
No symbol table info available.
#4  0x4a13e4b0 in ?? ()
No symbol table info available.
#5  0x00000000 in ?? ()
No symbol table info available.