#pragma D option quiet

inline int is_mbuf[uma_zone_t a] = (a == `zone_mbuf || a == `zone_clust);

fbt:kernel:uma_zfree_arg:entry
/ is_mbuf[args[0]] /
{
	this->m = (struct mbuf*)args[1];
}

fbt:kernel:uma_zfree_arg:entry
/ is_mbuf[args[0]] && this->m != NULL && (this->m->m_hdr.mh_flags & 2) && this->m->M_dat.MH.MH_pkthdr.rcvif != NULL && this->m->M_dat.MH.MH_pkthdr.rcvif->if_xname == "vboxnet0" /
{
        stack();
}