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[robogeek <david.herron@xxxxxxx>]

There's a longstanding known issue that if a jar file used by an
application is modified while the application is running then the java
VM will crash.

<i>the problem appears to occur only if multiple (java-) processes
access one jar file concurrently. I'm still not sure whether both are
just reading or (which seems more probable) one of them tries to write
something.</i>

-- 
memcpy crash
https://bugs.launchpad.net/bugs/227217
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Status in OpenJDK: New
Status in “openjdk-6” source package in Ubuntu: Incomplete

Bug description:
What I expected: normal application running
What happened instead (copy-paste from console; includes package versions):
#
# An unexpected error has been detected by Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0xb7dc69bc, pid=11999, tid=3029109648
#
# Java VM: OpenJDK Client VM (1.6.0-b09 mixed mode, sharing linux-x86)
# Problematic frame:
# C  [libc.so.6+0x739bc]  memcpy+0x1c
#
# An error report file with more information is saved as:
# /home/rijk/xldoc/deploy/hs_err_pid11999.log
#
# If you would like to submit a bug report, please visit:
#   https://bugs.launchpad.net/ubuntu/+source/openjdk-6/
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
Aborted

release of Ubuntu (from hs_err_pid11999.log):
OS:Ubuntu 8.04 (hardy)
uname:Linux 2.6.24-16-generic #1 SMP Thu Apr 10 13:23:42 UTC 2008 i686
libc:glibc 2.7 NPTL 2.7