CrashLoopBackOff on c1-oomkill (hephaisto-chaos)

! Escalated Critical CrashLoopBackOff cassette c1

target: hephaisto-chaos/Pod/c1-oomkill-6c8dd474dd-48sz5
workload: hephaisto-chaos/Deployment/c1-oomkill
node: —
opened: 2026-08-29 14:13:09
investigated: 1m 2s

expected root cause — the answer key

The container is being OOMKilled: it allocates roughly 200Mi against a 64Mi memory limit, so the kernel kills it and Kubernetes restarts it repeatedly.

This is never shown to the model. It is what the grader compared the diagnosis against, and it is on this page because a demo that showed only the answer would be asking you to take the grading on trust.

signals 7

reason	message	first seen	n
BackOff	Back-off restarting failed container balloon in pod c1-oomkill-6c8dd474dd-48sz5_hephaisto-chaos(dc97430f-e36f-4e64-bf01-0d2898a97e51)	2026-08-29 14:13:09	1
CrashLoopBackOff	container balloon: CrashLoopBackOff. last exit code 128 (ContainerCannotRun), restartCount 2	2026-08-29 14:11:00	1
BackOff	Back-off restarting failed container balloon in pod c1-oomkill-6c8dd474dd-48sz5_hephaisto-chaos(dc97430f-e36f-4e64-bf01-0d2898a97e51)	2026-08-29 14:13:09	2
RestartStorm	3 restarts observed in the trend window (total 3)	2026-08-29 14:11:00	1
BackOff	Back-off restarting failed container balloon in pod c1-oomkill-6c8dd474dd-48sz5_hephaisto-chaos(dc97430f-e36f-4e64-bf01-0d2898a97e51)	2026-08-29 14:13:09	3
CrashLoopBackOff	container balloon: CrashLoopBackOff. last exit code 128 (ContainerCannotRun), restartCount 3	2026-08-29 14:11:00	1
CrashLoopBackOff	container balloon: CrashLoopBackOff. last exit code 128 (ContainerCannotRun), restartCount 3	2026-08-29 14:11:00	1

state transitions

2026-08-29 14:13:09 Detected DEMO DATA — replayed from cassette c1, recorded against a real k3s cluster. Investigated by gpt-oss:120b on 2026-09-01 against a tool trace from gemini-3.7-flash, and graded Correct against the answer key. Timestamps are the original recording times.
2026-09-01 21:46:51 Detected → Investigating Investigating with gpt-oss:120b.
2026-09-01 21:47:53 Investigating → Escalated Diagnosed, and a plan was proposed. Nothing executes in Observe mode.

investigation

model: gpt-oss:120b
steps: 7
tool calls: 6
tokens: 73.5k in / 2.1k out
cost: $0.0026
confidence: 0.92
ended: Concluded

trace

1 llm model turn internal 14.3s · 8.3k tok · $0.0003
model output — its reasoning, and the tools it asked for
```
-> calls get_pod_logs
```

2 tool get_pod_logs kubernetes 0ms · 212 B

arguments

{"container":"balloon","name":"c1-oomkill-6c8dd474dd-48sz5","namespace":"hephaisto-chaos","previous":true}

result digest — what the model actually saw

[step 01a05ef0-ab31-78b2-900c-05cb0586c224] get_pod_logs
log digest: 1 lines, 212 bytes

-- notable lines --
no previous logs for hephaisto-chaos/c1-oomkill-6c8dd474dd-48sz5. A container that was OOMKilled, or that never started (image pull or config error), writes nothing - absence here is consistent with those causes.

-- last 1 lines --
no previous logs for hephaisto-chaos/c1-oomkill-6c8dd474dd-48sz5. A container that was OOMKilled, or that never started (image pull or config error), writes nothing - absence here is consistent with those causes.

3 llm model turn internal 1.9s · 8.5k tok · $0.0003
model output — its reasoning, and the tools it asked for
```
-> calls get_pod
```

4 tool get_pod kubernetes 0ms · 1.2 KiB

arguments

{"name":"c1-oomkill-6c8dd474dd-48sz5","namespace":"hephaisto-chaos"}

result digest — what the model actually saw

[step 01a05ef0-b2c7-72c8-b609-90f12548c934] get_pod
log digest: 16 lines, 1251 bytes

-- notable lines --
pod hephaisto-chaos/c1-oomkill-6c8dd474dd-48sz5
phase: Running  node: lima-rancher-desktop  age: 3m

conditions:

-- last 16 lines --
pod hephaisto-chaos/c1-oomkill-6c8dd474dd-48sz5
phase: Running  node: lima-rancher-desktop  age: 3m

conditions:
type                       status  reason              message                                    since
-------------------------  ------  ------------------  -----------------------------------------  -----
PodReadyToStartContainers  True    -                   -                                          3m
Initialized                True    -                   -                                          3m
Ready                      False   ContainersNotReady  containers with unready status: [balloon]  1m
ContainersReady            False   ContainersNotReady  containers with unready status: [balloon]  1m
PodScheduled               True    -                   -                                          3m

containers:
container  ready  state    reason            restarts  last exit                      image         requests             limits
---------  -----  -------  ----------------  --------  -----------------------------  ------------  -------------------  --------------------
balloon    no     waiting  CrashLoopBackOff  3         exit 128 (ContainerCannotRun)  busybox:1.37  cpu=10m,memory=32Mi  cpu=200m,memory=64Mi

5 llm model turn internal 2.5s · 8.9k tok · $0.0003
model output — its reasoning, and the tools it asked for
```
-> calls describe_pod
```

6 tool describe_pod kubernetes 0ms · 6.2 KiB ~ truncated

arguments

{"name":"c1-oomkill-6c8dd474dd-48sz5","namespace":"hephaisto-chaos"}

result digest — what the model actually saw

[step 01a05ef0-bc8e-7e43-8cb6-4c547de1d2b6] describe_pod
log digest: 195 lines, 6380 bytes

-- repeated patterns --
x7 [#48 .. #181]         cpu: 200m
x6 [#110 .. #173]     observedGeneration: 1
x5 [#45 .. #165]     name: balloon
x5 [#52 .. #184]         memory: 32Mi
x3 [#46 .. #179]     resources:
x3 [#47 .. #180]       limits:
x3 [#49 .. #182]         memory: 64Mi
x3 [#50 .. #183]       requests:
x3 [#109 .. #129]   - lastTransitionTime: "2026-08-29T14:11:00Z"
x3 [#111 .. #131]     status: "True"

-- notable lines --
metadata:
  annotations:
  creationTimestamp: "2026-08-29T14:11:00Z"
  generateName: c1-oomkill-6c8dd474dd-
  generation: 1
  labels:
    app.kubernetes.io/managed-by: tilt
    app.kubernetes.io/name: c1-oomkill
    hephaisto.chaos/fault: oomkill
    hephaisto.chaos/scenario: c1
    pod-template-hash: 6c8dd474dd
    tilt.dev/pod-template-hash: ef027a2e5c986c5052d0
  name: c1-oomkill-6c8dd474dd-48sz5
  namespace: hephaisto-chaos
  ownerReferences:
  - apiVersion: apps/v1
    kind: ReplicaSet
    blockOwnerDeletion: true
    controller: true
    name: c1-oomkill-6c8dd474dd
    uid: 9bb5c629-3563-45ac-8a3f-b5e441e9a43c
  uid: dc97430f-e36f-4e64-bf01-0d2898a97e51
spec:
        containerID: docker://05bbff0139e8d3ac6748a363adbfffaca3c7867f4db4021962ae1f38a45c5dc2
        exitCode: 128
        finishedAt: "2026-08-29T14:13:20Z"
        message: 'failed to create task for container: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: container init was OOM-killed (memory limit too low?)'
        reason: ContainerCannotRun
        startedAt: "2026-08-29T14:13:20Z"
    name: balloon
    started: false
    state:
      waiting:
        message: back-off 40s restarting failed container=balloon pod=c1-oomkill-6c8dd474dd-48sz5_hephaisto-chaos(dc97430f-e36f-4e64-bf01-0d2898a97e51)
        reason: CrashLoopBackOff
    volumeMounts:
    - mountPath: /balloon
events for this pod:
type     reason     count  objects                          first  last  message
-------  ---------  -----  -------------------------------  -----  ----  ------------------------------------------------------------------------------------------------
Warning  BackOff    3      Pod/c1-oomkill-6c8dd474dd-48sz5  41s    41s   Back-off restarting failed container balloon in pod c1-oomkill-6c8dd474dd-48sz5_hephaisto-chaos…
Normal   Pulled     4      Pod/c1-oomkill-6c8dd474dd-48sz5  47s    47s   Container image "busybox:1.37" already present on machine and can be accessed by the pod
Normal   Created    4      Pod/c1-oomkill-6c8dd474dd-48sz5  47s    47s   Container created
Warning  Failed     3      Pod/c1-oomkill-6c8dd474dd-48sz5  47s    47s   Error: failed to start container "balloon": Error response from daemon: failed to create task f…
Normal   Scheduled  1      Pod/c1-oomkill-6c8dd474dd-48sz5  3m     3m    Successfully assigned hephaisto-chaos/c1-oomkill-6c8dd474dd-48sz5 to lima-rancher-desktop
Normal   Started    1      Pod/c1-oomkill-6c8dd474dd-48sz5  3m     3m    Container started

-- last 40 lines --
        memory: 32Mi
    restartCount: 3
    started: false
    state:
      waiting:
        message: back-off 40s restarting failed container=balloon pod=c1-oomkill-6c8dd474dd-48sz5_hephaisto-chaos(dc97430f-e36f-4e64-bf01-0d2898a97e51)
        reason: CrashLoopBackOff
    volumeMounts:
    - mountPath: /balloon
      name: balloon
    - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
      name: kube-api-access-r6p68
      readOnly: true
      recursiveReadOnly: Disabled
  hostIP: 0.0.0.0
  hostIPs:
  - ip: 0.0.0.0
  observedGeneration: 1
  phase: Running
  podIP: 0.0.0.0
  podIPs:
  - ip: 0.0.0.0
  qosClass: Burstable
  resources:
    limits:
      cpu: 200m
      memory: 64Mi
    requests:
      memory: 32Mi
  startTime: "2026-08-29T14:11:00Z"

events for this pod:
type     reason     count  objects                          first  last  message
-------  ---------  -----  -------------------------------  -----  ----  ------------------------------------------------------------------------------------------------
Warning  BackOff    3      Pod/c1-oomkill-6c8dd474dd-48sz5  41s    41s   Back-off restarting failed container balloon in pod c1-oomkill-6c8dd474dd-48sz5_hephaisto-chaos…
Normal   Pulled     4      Pod/c1-oomkill-6c8dd474dd-48sz5  47s    47s   Container image "busybox:1.37" already present on machine and can be accessed by the pod
Normal   Created    4      Pod/c1-oomkill-6c8dd474dd-48sz5  47s    47s   Container created
Warning  Failed     3      Pod/c1-oomkill-6c8dd474dd-48sz5  47s    47s   Error: failed to start container "balloon": Error response from daemon: failed to create task f…
Normal   Scheduled  1      Pod/c1-oomkill-6c8dd474dd-48sz5  3m     3m    Successfully assigned hephaisto-chaos/c1-oomkill-6c8dd474dd-48sz5 to lima-rancher-desktop
Normal   Started    1      Pod/c1-oomkill-6c8dd474dd-48sz5  3m     3m    Container started

[truncated: 115 of 195 lines omitted]

raw result — the untruncated tool output (6.2 KiB)

apiVersion: v1
kind: Pod
metadata:
  annotations:
  creationTimestamp: "2026-08-29T14:11:00Z"
  generateName: c1-oomkill-6c8dd474dd-
  generation: 1
  labels:
    app.kubernetes.io/managed-by: tilt
    app.kubernetes.io/name: c1-oomkill
    hephaisto.chaos/fault: oomkill
    hephaisto.chaos/scenario: c1
    pod-template-hash: 6c8dd474dd
    tilt.dev/pod-template-hash: ef027a2e5c986c5052d0
  name: c1-oomkill-6c8dd474dd-48sz5
  namespace: hephaisto-chaos
  ownerReferences:
  - apiVersion: apps/v1
    kind: ReplicaSet
    blockOwnerDeletion: true
    controller: true
    name: c1-oomkill-6c8dd474dd
    uid: 9bb5c629-3563-45ac-8a3f-b5e441e9a43c
  uid: dc97430f-e36f-4e64-bf01-0d2898a97e51
spec:
  containers:
  - args:
    - |
      # Silence *everything* for the whole lifetime of the process.
      # This is what makes the fixture log-free; do not remove it.
      exec >/dev/null 2>&1
      i=0
      while [ "$i" -lt 50 ]; do
        dd if=/dev/zero of=/balloon/block.$i bs=1M count=4
        i=$((i + 1))
        sleep 1
      done
      # ~200Mi requested against a 64Mi limit: we never get here.
      sleep 3600
    command:
    - /bin/sh
    - -c
    image: busybox:1.37
    imagePullPolicy: IfNotPresent
    name: balloon
    resources:
      limits:
        cpu: 200m
        memory: 64Mi
      requests:
        cpu: 10m
        memory: 32Mi
    terminationMessagePath: /dev/termination-log
    terminationMessagePolicy: File
    volumeMounts:
    - mountPath: /balloon
      name: balloon
    - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
      name: kube-api-access-r6p68
      readOnly: true
  dnsPolicy: ClusterFirst
  enableServiceLinks: true
  nodeName: lima-rancher-desktop
  preemptionPolicy: PreemptLowerPriority
  priority: 0
  restartPolicy: Always
  schedulerName: default-scheduler
  securityContext: {}
  serviceAccount: default
  serviceAccountName: default
  terminationGracePeriodSeconds: 1
  tolerations:
  - effect: NoExecute
    key: node.kubernetes.io/not-ready
    operator: Exists
    tolerationSeconds: 300
  - effect: NoExecute
    key: node.kubernetes.io/unreachable
    operator: Exists
    tolerationSeconds: 300
  volumes:
  - emptyDir:
      medium: Memory
      sizeLimit: 256Mi
    name: balloon
  - name: kube-api-access-r6p68
    projected:
      defaultMode: 420
      sources:
      - serviceAccountToken:
          expirationSeconds: 3607
          path: token
      - configMap:
          items:
          - key: ca.crt
            path: ca.crt
          name: kube-root-ca.crt
      - downwardAPI:
          items:
          - fieldRef:
              apiVersion: v1
              fieldPath: metadata.namespace
            path: namespace
status:
  allocatedResources:
    cpu: 10m
    memory: 32Mi
  conditions:
  - lastTransitionTime: "2026-08-29T14:11:00Z"
    observedGeneration: 1
    status: "True"
    type: PodReadyToStartContainers
  - lastTransitionTime: "2026-08-29T14:11:00Z"
    observedGeneration: 1
    status: "True"
    type: Initialized
  - lastTransitionTime: "2026-08-29T14:12:43Z"
    message: 'containers with unready status: [balloon]'
    observedGeneration: 1
    reason: ContainersNotReady
    status: "False"
    type: Ready
  - lastTransitionTime: "2026-08-29T14:12:43Z"
    message: 'containers with unready status: [balloon]'
    observedGeneration: 1
    reason: ContainersNotReady
    status: "False"
    type: ContainersReady
  - lastTransitionTime: "2026-08-29T14:11:00Z"
    observedGeneration: 1
    status: "True"
    type: PodScheduled
  containerStatuses:
  - allocatedResources:
      cpu: 10m
      memory: 32Mi
    containerID: docker://05bbff0139e8d3ac6748a363adbfffaca3c7867f4db4021962ae1f38a45c5dc2
    image: busybox:1.37
    imageID: docker-pullable://busybox@sha256:9db7b59979c38555a39def84a31fb98b5296952f9e3afd4f6f11f05b07adfab0
    lastState:
      terminated:
        containerID: docker://05bbff0139e8d3ac6748a363adbfffaca3c7867f4db4021962ae1f38a45c5dc2
        exitCode: 128
        finishedAt: "2026-08-29T14:13:20Z"
        message: 'failed to create task for container: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: container init was OOM-killed (memory limit too low?)'
        reason: ContainerCannotRun
        startedAt: "2026-08-29T14:13:20Z"
    name: balloon
    ready: false
    resources:
      limits:
        cpu: 200m
        memory: 64Mi
      requests:
        cpu: 10m
        memory: 32Mi
    restartCount: 3
    started: false
    state:
      waiting:
        message: back-off 40s restarting failed container=balloon pod=c1-oomkill-6c8dd474dd-48sz5_hephaisto-chaos(dc97430f-e36f-4e64-bf01-0d2898a97e51)
        reason: CrashLoopBackOff
    volumeMounts:
    - mountPath: /balloon
      name: balloon
    - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
      name: kube-api-access-r6p68
      readOnly: true
      recursiveReadOnly: Disabled
  hostIP: 0.0.0.0
  hostIPs:
  - ip: 0.0.0.0
  observedGeneration: 1
  phase: Running
  podIP: 0.0.0.0
  podIPs:
  - ip: 0.0.0.0
  qosClass: Burstable
  resources:
    limits:
      cpu: 200m
      memory: 64Mi
    requests:
      memory: 32Mi
  startTime: "2026-08-29T14:11:00Z"

events for this pod:
type     reason     count  objects                          first  last  message
-------  ---------  -----  -------------------------------  -----  ----  ------------------------------------------------------------------------------------------------
Warning  BackOff    3      Pod/c1-oomkill-6c8dd474dd-48sz5  41s    41s   Back-off restarting failed container balloon in pod c1-oomkill-6c8dd474dd-48sz5_hephaisto-chaos…
Normal   Pulled     4      Pod/c1-oomkill-6c8dd474dd-48sz5  47s    47s   Container image "busybox:1.37" already present on machine and can be accessed by the pod
Normal   Created    4      Pod/c1-oomkill-6c8dd474dd-48sz5  47s    47s   Container created
Warning  Failed     3      Pod/c1-oomkill-6c8dd474dd-48sz5  47s    47s   Error: failed to start container "balloon": Error response from daemon: failed to create task f…
Normal   Scheduled  1      Pod/c1-oomkill-6c8dd474dd-48sz5  3m     3m    Successfully assigned hephaisto-chaos/c1-oomkill-6c8dd474dd-48sz5 to lima-rancher-desktop
Normal   Started    1      Pod/c1-oomkill-6c8dd474dd-48sz5  3m     3m    Container started

7 llm model turn internal 7.4s · 10.8k tok · $0.0004
model output — its reasoning, and the tools it asked for
```
-> calls get_workload
```

8 tool get_workload kubernetes 0ms · 938 B

arguments

{"kind":"Deployment","name":"c1-oomkill","namespace":"hephaisto-chaos"}

result digest — what the model actually saw

[step 01a05ef0-d966-7e08-92d2-5355a4bfe25d] get_workload
log digest: 16 lines, 938 bytes

-- notable lines --
Deployment hephaisto-chaos/c1-oomkill  age 23h49m
revision: 2
replicas: desired=1 ready=0 updated=1 available=0 unavailable=1
strategy: RollingUpdate
conditions:
type         status  reason                      message                                                          since
-----------  ------  --------------------------  ---------------------------------------------------------------  ------
Progressing  True    NewReplicaSetAvailable      ReplicaSet "c1-oomkill-6c8dd474dd" has successfully progressed.  23h49m
Available    False   MinimumReplicasUnavailable  Deployment does not have minimum availability.                   1m

containers (from the pod template):

-- last 16 lines --
Deployment hephaisto-chaos/c1-oomkill  age 23h49m
revision: 2
replicas: desired=1 ready=0 updated=1 available=0 unavailable=1
strategy: RollingUpdate
generation: 2 (observed - the controller is acting on the current spec)

conditions:
type         status  reason                      message                                                          since
-----------  ------  --------------------------  ---------------------------------------------------------------  ------
Progressing  True    NewReplicaSetAvailable      ReplicaSet "c1-oomkill-6c8dd474dd" has successfully progressed.  23h49m
Available    False   MinimumReplicasUnavailable  Deployment does not have minimum availability.                   1m

containers (from the pod template):
container  image         requests             limits
---------  ------------  -------------------  --------------------
balloon    busybox:1.37  cpu=10m,memory=32Mi  cpu=200m,memory=64Mi

9 llm model turn internal 12.4s · 11.7k tok · $0.0005
model output — its reasoning, and the tools it asked for
```
-> calls conclude
```

10 tool conclude internal 3ms · 129 B x failed

x The arguments dictionary is missing a value for the required parameter 'request'. (Parameter 'arguments')

arguments

{"findings":[{"category":"resource-limit","confidence":0.92,"evidence":[{"excerpt":"exitCode: 128","step_id":"01a05ef0-bc8e-7e43-8cb6-4c547de1d2b6"},{"excerpt":"message: \u0027failed to create task for container: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: container init was OOM-killed (memory limit too low?)\u0027","step_id":"01a05ef0-bc8e-7e43-8cb6-4c547de1d2b6"},{"excerpt":"no previous logs for hephaisto-chaos/c1-oomkill-6c8dd474dd-48sz5. A container that was OOMKilled, or that never started (image pull or config error), writes nothing","step_id":"01a05ef0-ab31-78b2-900c-05cb0586c224"}],"hypothesis":"The container \u0027balloon\u0027 is being OOMKilled during init because its memory limit (64Mi) is too low for the process, causing exit code 128 and CrashLoopBackOff."}],"summary":"The pod c1-oomkill fails to start because its init process exceeds the 64Mi memory limit, resulting in an OOM kill (exit code 128). Raising the container\u0027s memory limit or reducing its startup memory usage will resolve the CrashLoopBackOff."}

result digest — what the model actually saw

[step 01a05ef1-09df-73be-a2c0-ceafd2930de6] conclude
log digest: 1 lines, 129 bytes

-- last 1 lines --
ERROR: conclude failed: The arguments dictionary is missing a value for the required parameter 'request'. (Parameter 'arguments')

11 llm model turn internal 6.9s · 11.8k tok · $0.0004
model output — its reasoning, and the tools it asked for
```
-> calls conclude
```

12 tool conclude internal 7ms · 141 B

arguments

{"request":{"findings":[{"category":"resource-limit","confidence":0.92,"evidence":[{"excerpt":"exitCode: 128","step_id":"01a05ef0-bc8e-7e43-8cb6-4c547de1d2b6"},{"excerpt":"message: \u0027failed to create task for container: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: container init was OOM-killed (memory limit too low?)\u0027","step_id":"01a05ef0-bc8e-7e43-8cb6-4c547de1d2b6"},{"excerpt":"no previous logs for hephaisto-chaos/c1-oomkill-6c8dd474dd-48sz5. A container that was OOMKilled, or that never started (image pull or config error), writes nothing","step_id":"01a05ef0-ab31-78b2-900c-05cb0586c224"}],"hypothesis":"The container \u0022balloon\u0022 is being OOMKilled during init because its memory limit (64Mi) is too low for the process, causing exit code 128 and CrashLoopBackOff."}],"summary":"The pod c1-oomkill fails to start because its init process exceeds the 64Mi memory limit, resulting in an OOM kill (exit code 128). Raising the container\u0027s memory limit or reducing its startup memory usage will resolve the CrashLoopBackOff."}}

result digest — what the model actually saw

[step 01a05ef1-24e5-70a8-b2a1-c1e46956af3c] conclude
log digest: 1 lines, 141 bytes

-- last 1 lines --
Conclusion recorded. Your citations are now checked against what the tools actually returned; any that do not match are discarded. Stop here.

13 llm model turn internal 7.3s · 12.2k tok · $0.0004

model output — its reasoning, and the tools it asked for

**Primary Finding**

- **Category:** `resource-limit`  
- **Hypothesis:** The container `balloon` is being OOM‑killed during its start‑up because the memory limit of 64 MiB is insufficient for the process, causing an exit code 128 and a CrashLoopBackOff.  
- **Confidence:** 0.92  

**Evidence**

| Step ID | Excerpt |
|---------|------------------------------------------------------------|
| 01a05ef0-bc8e-7e43-8cb6-4c547de1d2b6 | `exitCode: 128` |
| 01a05ef0-bc8e-7e43-8cb6-4c547de1d2b6 | `message: 'failed to create task for container: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: container init was OOM‑killed (memory limit too low?)'` |
| 01a05ef0-ab31-78b2-900c-05cb0586c224 | `no previous logs for hephaisto-chaos/c1-oomkill-6c8dd474dd-48sz5. A container that was OOMKilled, or that never started (image pull or config error), writes nothing` |

**Summary**

The pod `c1-oomkill-6c8dd474dd-48sz5` repeatedly fails to start because its init process exceeds the configured memory limit of 64 MiB. The kubelet reports an OOM‑kill (`exitCode 128`, “container init was OOM‑killed (memory limit too low?)”), leading to CrashLoopBackOff. Raising the container’s memory limit or reducing its startup memory consumption will stop the crash loop.

14 llm model turn internal 8.7s · 3.3k tok · $0.0001

model output — its reasoning, and the tools it asked for

{
  "summary": "The CrashLoopBackOff is caused by the container's memory limit being too low (64Mi), leading to OOM kill during init. Fix requires increasing the memory request/limit in the Deployment, which cannot be performed with available actions.",
  "no_action_required": true,
  "actions": []
}

findings 1

primary resource-limit 0.92

The container "balloon" is being OOMKilled during init because its memory limit (64Mi) is too low for the process, causing exit code 128 and CrashLoopBackOff.

step 6 exitCode: 128
step 6 message: 'failed to create task for container: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: container init was OOM-killed (memory limit too low?)'
step 2 no previous logs for hephaisto-chaos/c1-oomkill-6c8dd474dd-48sz5. A container that was OOMKilled, or that never started (image pull or config error), writes nothing

plan

The CrashLoopBackOff is caused by the container's memory limit being too low (64Mi), leading to OOM kill during init. Fix requires increasing the memory request/limit in the Deployment, which cannot be performed with available actions.

No action was proposed. The planner set no_action_required — which is the expected outcome for most incidents, and what the planning prompt tells it to default to.

how it was graded

root cause: Correct
plan: CorrectlyDeclined
structurally sound: yes
recorded: 2026-09-01
agent version: 0.5.1-main.0.4+23df805946ec0c37b0adafafeb12130231adec93

prompt sha256:b0fbe56d8f7dc168 STALE - prompts and runbooks now hash sha256:718988bb4e7837f3