--- /sys/src/9/port/sysproc.c	Sun Dec 17 12:32:57 2017
+++ ../frontmods/port/sysproc.c	Fri Dec 22 02:26:47 2017
@@ -36,6 +36,7 @@
 	Pgrp *opg;
 	Rgrp *org;
 	Egrp *oeg;
+	Sgrp *osg;
 	ulong pid, flag;
 	Mach *wm;
 
@@ -75,6 +76,12 @@
 			up->rgrp = newrgrp();
 			closergrp(org);
 		}
+		if(flag & RFCSRVG) {
+			osg = up->sgrp;
+			up->sgrp = smalloc(sizeof(Sgrp));
+			up->sgrp->ref = 1;
+			closesgrp(osg);
+		}
 		if(flag & (RFENVG|RFCENVG)) {
 			oeg = up->egrp;
 			up->egrp = smalloc(sizeof(Egrp));
@@ -160,6 +167,15 @@
 	else {
 		incref(up->rgrp);
 		p->rgrp = up->rgrp;
+	}
+
+	/* Srv group */
+	if(flag & RFCSRVG) {
+		p->sgrp = smalloc(sizeof(Sgrp));
+		p->sgrp->ref = 1;
+	} else {
+		p->sgrp = up->sgrp;
+		incref(p->sgrp);
 	}
 
 	/* Environment group */