We've seen in our test cluster that tasks that were launched with the mesos containerizer are recovered after slave restart, but actual command process is not running anymore and the checkpointed executor is not marked as completed.
The Mesos containerizer recovers and all the isolators couldn't recover the task, but the containerizer itself is somehow never removed and the monitor kept calling usage on the containerizer.
Relevant log lines from the beginning of slave recovery:
I0408 18:06:33.261379 32504 slave.cpp:577] Successfully attached file '/hdd/mesos/slave/slaves/20150401-160104-251662508-5050-2197-S1/frameworks/20141222-194154-218108076-5050-4125-0004/executors/ct:1427921848104:0:EM DataDog Uploader:/runs/990741ed-909e-49cc-83f8-be63298872da'
I0408 18:06:36.583277 32511 containerizer.cpp:350] Recovering container '990741ed-909e-49cc-83f8-be63298872da' for executor 'ct:1427921848104:0:EM DataDog Uploader:' of framework 20141222-194154-218108076-5050-4125-0004
I0408 18:06:37.017122 32511 linux_launcher.cpp:162] Couldn't find freezer cgroup for container 990741ed-909e-49cc-83f8-be63298872da, assuming already destroyed
W0408 18:06:37.074916 32496 cpushare.cpp:199] Couldn't find cgroup for container 990741ed-909e-49cc-83f8-be63298872da
I0408 18:06:37.075173 32486 mem.cpp:158] Couldn't find cgroup for container 990741ed-909e-49cc-83f8-be63298872da
E0408 18:06:37.092279 32496 containerizer.cpp:1136] Error in a resource limitation for container 990741ed-909e-49cc-83f8-be63298872da: Unknown container
I0408 18:06:37.092643 32496 containerizer.cpp:906] Destroying container '990741ed-909e-49cc-83f8-be63298872da'
W0408 18:06:37.229626 32501 containerizer.cpp:807] Ignoring update for currently being destroyed container: 990741ed-909e-49cc-83f8-be63298872da
W0408 18:06:38.129873 32484 containerizer.cpp:844] Skipping resource statistic for container 990741ed-909e-49cc-83f8-be63298872da because: Unknown container
W0408 18:06:38.129909 32484 containerizer.cpp:844] Skipping resource statistic for container 990741ed-909e-49cc-83f8-be63298872da because: Unknown container