Hi, I think this patch will fix your issue. Can you check? https://svnweb.freebsd.org/changeset/base/357050 Look like td->td_oncpu is invalid. > pc = cpuid_to_pcpu[td->td_oncpu]; /* pcpu_find(td->td_oncpu); */ > > rm_tracker_add(pc, tracker); And thanks for running -current ;-) --HPS