There is a FOSS Factory bounty (p267) on this task.
IRC, freenode, #hurd, 2011-02-17
<azeem> task 39011c10 deallocating an invalid port 349, most probably a bug. <azeem> kernel: Page fault (14), code=6 <azeem> Stopped at 0x28b9c7: orb %bh,0(%ecx,%edi,2) <azeem> db> [...] <antrik> tschwinge: I doubt the deallocating warning is related to the later fault <tschwinge> antrik: YOu may be right. <tschwinge> Perhaps it'd be a good idea to add some sort of timestamp to Mach messages. <tschwinge> Like in Linux' dmesg. <tschwinge> Or just RDTSC (internal processor counter).