What is "invalid argument" by a rootkit check?

I thought I should run a rootkit in connection to the recent Debian apt vulnerability , which I think I have fixed though. I used chkrootkit and get these two lines, which I'm not sure what to do with: Checking `lkm'... find: ‘/proc/7952/task/7952/net’: Invalid argument find: ‘/proc/7952/net’: Invalid argument They stand out in the otherwise clean listing.