From Bugzilla Helper:
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.5)
Gecko/20031007 Firebird/0.7

Description of problem:
Anytime I try to access any PTAL functions on my USB connected HP
OfficeJet K60, the entire machine locks up solid.  By 'access' I mean
printing a CUPS test page or running 'ptal-hp display'.

I am running on a HyperThreaded P4 using the smp kernels.  I have
tried the shipped RH9 kernel, one of the early errata kernels, and the
current (as of 11/1) errata kernel.

Version-Release number of selected component (if applicable):
hpoj-0.90-19, hpoj-0.90-14

How reproducible:
Always

Steps to Reproduce:
1. export LANG=C  #to get around the perl problem
2. /etc/init.d/hpoj start
3. ptal-hp display
    

Actual Results:  the machine locked up solid...  no reponse to
keyboard or mouse input...  doesn't even answer pings

Expected Results:  a text string that matches what's on the display of
my printer

Additional info:

This hang doesn't happen when booted with the uniprocessor kernel. 
Which probably means it's a kernel bug, but I don't know enough about
how the PTAL stuff works to file a meaningful kernel bug report.