MOUNT_RC=0
--- poisoned testdir (PATCHED: count>limit early EIO, NO 520KB OOB read) ---
ls: /mnt/t1/testdir/: Input/output error
POISONED_LS_RC=1
--- root dir still works (regression) ---
ROOT_LS_RC=0
--- guest alive ---
 7:55PM  up 21 mins, 0 users, load averages: 0.08, 0.04, 0.01