CRED_FLAG_GROUPSET
newcred->cr_flags |= CRED_FLAG_GROUPSET;
newcred->cr_flags |= CRED_FLAG_GROUPSET;
MPASS2((cr->cr_flags & CRED_FLAG_GROUPSET) == 0,
cr->cr_flags |= CRED_FLAG_GROUPSET;
cr->cr_flags |= CRED_FLAG_GROUPSET;
cr->cr_flags &= ~CRED_FLAG_GROUPSET;
cr->cr_flags |= CRED_FLAG_GROUPSET;