--- /sys/src/9/pc/main.c	Fri Dec 20 19:41:23 2019
+++ ../frontmods/pc/main.c	Fri Dec 20 23:42:52 2019
@@ -157,6 +157,8 @@
 	p->pgrp = newpgrp();
 	p->egrp = smalloc(sizeof(Egrp));
 	p->egrp->ref = 1;
+	p->sgrp = smalloc(sizeof(Sgrp));
+	p->sgrp->ref = 1;
 	p->fgrp = dupfgrp(nil);
 	p->rgrp = newrgrp();
 	p->procmode = 0640;