--- zzzz-none-000/linux-2.6.39.4/ipc/sem.c	2011-08-03 19:43:28.000000000 +0000
+++ puma6-atom-6490-729/linux-2.6.39.4/ipc/sem.c	2021-11-10 13:38:18.000000000 +0000
@@ -323,6 +323,7 @@
 	struct ipc_namespace *ns;
 	struct ipc_ops sem_ops;
 	struct ipc_params sem_params;
+	int id;
 
 	ns = current->nsproxy->ipc_ns;
 
@@ -337,7 +338,16 @@
 	sem_params.flg = semflg;
 	sem_params.u.nsems = nsems;
 
-	return ipcget(ns, &sem_ids(ns), &sem_ops, &sem_params);
+	id = ipcget(ns, &sem_ids(ns), &sem_ops, &sem_params);
+
+#if 0
+	if (id >= 0)
+	   printk(KERN_NOTICE "%s(%d): semget(0x%lx,%d,0%o)=%d\n",
+						  current->comm, current->pid,
+						  key, nsems, semflg, id);
+#endif
+
+	return id;
 }
 
 /*
@@ -1087,6 +1097,7 @@
 	if (semid < 0)
 		return -EINVAL;
 
+
 	version = ipc_parse_version(&cmd);
 	ns = current->nsproxy->ipc_ns;
 
@@ -1104,6 +1115,9 @@
 	case GETZCNT:
 	case SETVAL:
 	case SETALL:
+	   if (semid == 0)
+		  printk(KERN_ERR "semctl(: %s(%d): using uninitialized semid (0).\n",
+						  current->comm, current->pid);
 		err = semctl_main(ns,semid,semnum,cmd,version,arg);
 		return err;
 	case IPC_RMID:
@@ -1301,6 +1315,10 @@
 	struct ipc_namespace *ns;
 	struct list_head tasks;
 
+	if (semid == 0)
+	   printk(KERN_ERR "sem(timed)op: %s(%d): using uninitialized semid (0).\n",
+					   current->comm, current->pid);
+
 	ns = current->nsproxy->ipc_ns;
 
 	if (nsops < 1 || semid < 0)
@@ -1586,6 +1604,9 @@
 			struct sem * semaphore = &sma->sem_base[i];
 			if (un->semadj[i]) {
 				semaphore->semval += un->semadj[i];
+				pr_notice("%s(%d): sem-undo(%d) += %d (semval %d)\n",
+					  tsk->comm, tsk->pid, semid,
+					  un->semadj[i], semaphore->semval);
 				/*
 				 * Range checks of the new semaphore value,
 				 * not defined by sus: