/shared/tmp filling up

We have a F5 unit where the /shared/tmp directory fills up rather rapidly.

drwxr-xr-x. 2 root  root     4096 Jul 15 22:02 im.11584

drwxr-xr-x. 2 root  root     4096 Jul 20 19:47 im.12080

drwxr-xr-x. 2 root  root     4096 Jul 18 19:49 im12156

drwxr-xr-x. 2 root  root     4096 Jul 19 19:49 im12167

drwxr-xr-x. 2 root  root     4096 Jul 20 19:49 im12173

drwxr-xr-x. 2 root  root     4096 Jul 21 19:49 im12362

drwxr-xr-x. 2 root  root     4096 Jul 17 22:11 im1604

drwxr-xr-x. 2 root  root     4096 Jul 18 19:47 im.17131

drwxr-xr-x. 2 root  root     4096 Jul 16 22:04 im25449

drwxr-xr-x. 2 root  root     4096 Jul 21 19:47 im.27046

drwxr-xr-x. 2 root  root     4096 Jul 16 22:02 im.27387

drwxr-xr-x. 2 root  root     4096 Jul 19 19:47 im.30491

drwxr-xr-x. 2 root  root     4096 Jul 18 19:18 im4987

drwxr-xr-x. 2 root  root     4096 Jul 18 19:15 im.6634

We killed the iapp backup but the issue is still there.

Anyone got a clue to what might be causing this or how to determine the process that writes up this junk?