To even more increase strangeness I ran the test script on a notebook
with the same Ubuntu version (8.10) and I was unable to reproduce the
faulty behavior:

anco...@bitch:~$ ./testBackslashHex.sh
Executing backslash '\' test 'echo'...
   :) stable
|-----------------------------------------------------------------------------|
Executing backslash '\' test 'hexdump'...
   :) stable
|-----------------------------------------------------------------------------|
Executing backslash '\' test 'hexdump -x'...
   :) stable
|-----------------------------------------------------------------------------|
Executing backslash '\' test 'hexdump -x -s 1'...
   :) stable
|-----------------------------------------------------------------------------|
Executing backslash '\' test 'sed ... | iconv ... | hexdump -x -s 2'...
   :) stable
|-----------------------------------------------------------------------------|
Executing backslash '\' test 'xxd'...
   :) stable
|-----------------------------------------------------------------------------|
Executing backslash '\' test 'od'...
   :) stable

So to clarify the hardware environments this bug seems to be related
with here is a small list of tested machines where the faulty behavior
can be seen by running the provided test script:

- Intel Pentium 4 with HyperThreading enabled (2 logical CPUs) @ Debian 4
- Dual Intel Xeon Quad-Core (8 logical CPUs) @ Debian 4
- Intel Core 2 Duo (2 logical CPUs) @ Ubuntu 8.10
- AMD Athlon 64 X2 (2 logical CPUs) @ Ubuntu 8.10

And here is a list where I was unable to raise any errors:

- Intel Pentium M (1 logical CPU) @ Ubuntu 8.10


All Ubuntu 8.10 machines have the latest patches applied.

-- 
hexdump :: unexpected error when input ends with backslash
https://bugs.launchpad.net/bugs/342433
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