Hi again, sorry for my silence - I was absorbed by work and needed the laptop for it, so I didn't have time left for more tests... So if you still want to investigate this, I have now some more data, hopefully what you had asked for. I just ran a 'zypper up' and rebooted (kernel 4.7.4-2-default), with the bad gkrellm module active. Then I first grabbed a slabinfo (slabinfo.before), and then activated the tracing as last time, but left it running 20 minutes, then grabbed the stacktrace, and again a slabinfo (slabinfo.after) I'll attach the 3 files plus the kallsyms in a tgz archive in the next post.