diff --git a/kernel/fork.c b/kernel/fork.c
index cf13c44..083bf89 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1249,14 +1249,11 @@
 			__ptrace_link(p, current->parent);
 
 		if (thread_group_leader(p)) {
-			pid_t pgid = process_group(current);
-			pid_t sid = process_session(current);
-
 			p->signal->tty = current->signal->tty;
-			p->signal->pgrp = pgid;
+			p->signal->pgrp = process_group(current);
 			set_signal_session(p->signal, process_session(current));
-			attach_pid(p, PIDTYPE_PGID, find_pid(pgid));
-			attach_pid(p, PIDTYPE_SID, find_pid(sid));
+			attach_pid(p, PIDTYPE_PGID, task_pgrp(current));
+			attach_pid(p, PIDTYPE_SID, task_session(current));
 
 			list_add_tail_rcu(&p->tasks, &init_task.tasks);
 			__get_cpu_var(process_counts)++;