I talked to Bjorn Helgaas, and he claims that the change was not intentional. Matthew Wilcox pointed out that the ptrace patch was known to be problematic. I pulled it out of the kernel, and the problem went away.
kernel-image-2.4.20-ia64 pkgs are built from debian's kernel-source-2.4.20 package, which contains this patch. i'd recommend reassigning to one of those packages. thanks! -- --------------------------- dann frazier Hewlett-Packard Linux and Open Source Lab [EMAIL PROTECTED] (970) 898-0800

