CrashLoopBackOff on c13-wedged-lock (hephaisto-chaos)

investigation

model

gpt-oss:120b

steps

8

tool calls

7

tokens

127.2k in / 2.6k out

cost

$0.0043

confidence

0.92

ended

Concluded

trace

1. 7 llm model turn internal 11.5s · 14.5k tok · $0.0005

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

   -> calls describe_pod

2. 2 tool get_pod_logs kubernetes 6ms · 523 B

   arguments

   {"name": "c13-wedged-lock-6778bccbd9-djhrb", "previous": true, "container": "app", "namespace": "hephaisto-chaos"}

   result digest — what the model actually saw

   [step 01a063f7-2187-7cd0-9f1c-5642556aa140] get_pod_logs
   log digest: 8 lines, 523 bytes
   
   -- repeated patterns --
   x2 [2026-09-02T21:08:17.609445857Z .. 2026-09-02T21:08:17.609445857Z] FATAL: startup lock /scratch/startup.lock is still held from an earlier run of this container; it is released only on a clean shutdown; refusing to start
   
   -- notable lines --
   log digest: 1 lines, 185 bytes
   
   -- notable lines --
   2026-09-02T21:08:17.609445857Z FATAL: startup lock /scratch/startup.lock is still held from an earlier run of this container; it is released only on a clean shutdown; refusing to start
   
   -- last 1 lines --
   2026-09-02T21:08:17.609445857Z FATAL: startup lock /scratch/startup.lock is still held from an earlier run of this container; it is released only on a clean shutdown; refusing to start
   
   -- last 8 lines --
   previous container logs for hephaisto-chaos/c13-wedged-lock-6778bccbd9-djhrb/app
   log digest: 1 lines, 185 bytes
   
   -- notable lines --
   2026-09-02T21:08:17.609445857Z FATAL: startup lock /scratch/startup.lock is still held from an earlier run of this container; it is released only on a clean shutdown; refusing to start
   
   -- last 1 lines --
   2026-09-02T21:08:17.609445857Z FATAL: startup lock /scratch/startup.lock is still held from an earlier run of this container; it is released only on a clean shutdown; refusing to start
   

3. 1 llm model turn internal 27.1s · 12.5k tok · $0.0004

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

   -> calls get_pod_logs

4. 3 llm model turn internal 12.0s · 13.1k tok · $0.0004

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

   -> calls describe_pod

5. 4 tool describe_pod kubernetes 7ms · 6.9 KiB ~ truncated

   arguments

   {"name": "c13-wedged-lock-6778bccbd9-djhrb", "namespace": "hephaisto-chaos"}

   result digest — what the model actually saw

   [step 01a063f7-508c-7823-b476-424c2bf7e766] describe_pod
   log digest: 214 lines, 7073 bytes
   
   -- repeated patterns --
   x7 [#62 .. #199]         cpu: 100m
   x6 [#122 .. #191]     observedGeneration: 1
   x5 [#66 .. #202]         memory: 16Mi
   x3 [#60 .. #197]     resources:
   x3 [#61 .. #198]       limits:
   x3 [#63 .. #200]         memory: 64Mi
   x3 [#64 .. #201]       requests:
   x3 [#71 .. #183]       name: scratch
   x3 [#123 .. #143]     status: "True"
   x2 [#1 .. #113] apiVersion: v1
   
   -- notable lines --
         # container that did not exit cleanly. This process cannot tell that
         # from a lock a live process is holding, so it refuses to start.
         if [ -f "$LOCK" ]; then
           echo "FATAL: startup lock $LOCK is still held from an earlier run of this container; it is released only on a clean shutdown; refusing to start"
           exit 1
         fi
   
   
   -- last 40 lines --
         linux:
           gid: 0
           supplementalGroups:
           - 0
           - 10
           uid: 0
       volumeMounts:
       - mountPath: /scratch
         name: scratch
       - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
         name: kube-api-access-pzkdb
         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: 100m
         memory: 64Mi
       requests:
         memory: 16Mi
     startTime: "2026-09-02T20:41:34Z"
   
   events for this pod:
   type     reason     count  objects                               first  last  message
   -------  ---------  -----  ------------------------------------  -----  ----  ------------------------------------------------------------------------------------------------
   Warning  BackOff    28     Pod/c13-wedged-lock-6778bccbd9-djhrb  6s     6s    Back-off restarting failed container app in pod c13-wedged-lock-6778bccbd9-djhrb_hephaisto-chao…
   Normal   Pulled     10     Pod/c13-wedged-lock-6778bccbd9-djhrb  4m     4m    Container image "busybox:1.37" already present on machine and can be accessed by the pod
   Normal   Created    9      Pod/c13-wedged-lock-6778bccbd9-djhrb  14m    14m   Container created
   Normal   Started    9      Pod/c13-wedged-lock-6778bccbd9-djhrb  14m    14m   Container started
   Normal   Pulled     1      Pod/c13-wedged-lock-6778bccbd9-djhrb  30m    30m   Successfully pulled image "busybox:1.37" in 673ms (5.743s including waiting). Image size: 19113…
   Normal   Pulling    1      Pod/c13-wedged-lock-6778bccbd9-djhrb  30m    30m   Pulling image "busybox:1.37"
   Normal   Scheduled  1      Pod/c13-wedged-lock-6778bccbd9-djhrb  30m    30m   Successfully assigned hephaisto-chaos/c13-wedged-lock-6778bccbd9-djhrb to hephaisto-e2e-control…
   
   [truncated: 157 of 214 lines omitted]
   

   raw result — the untruncated tool output (6.9 KiB)

   apiVersion: v1
   kind: Pod
   metadata:
     creationTimestamp: "2026-09-02T20:41:34Z"
     generateName: c13-wedged-lock-6778bccbd9-
     generation: 1
     labels:
       app.kubernetes.io/name: c13-wedged-lock
       hephaisto.chaos/fault: transient
       hephaisto.chaos/scenario: c13
       pod-template-hash: 6778bccbd9
     name: c13-wedged-lock-6778bccbd9-djhrb
     namespace: hephaisto-chaos
     ownerReferences:
     - apiVersion: apps/v1
       kind: ReplicaSet
       blockOwnerDeletion: true
       controller: true
       name: c13-wedged-lock-6778bccbd9
       uid: 0b54776d-ffec-459c-aee3-d5adf8914e42
     uid: fd804da2-0249-487f-8713-0afaa8a933d4
   spec:
     containers:
     - args:
       - |
         LOCK=/scratch/startup.lock
   
         # A lock still present at startup was left by an earlier run of this
         # container that did not exit cleanly. This process cannot tell that
         # from a lock a live process is holding, so it refuses to start.
         if [ -f "$LOCK" ]; then
           echo "FATAL: startup lock $LOCK is still held from an earlier run of this container; it is released only on a clean shutdown; refusing to start"
           exit 1
         fi
   
         echo "$$" > "$LOCK"
         echo "startup lock $LOCK taken; serving"
   
         # Released on a clean shutdown, which is what makes an unclean one
         # leave it behind.
         trap 'rm -f "$LOCK"; echo "startup lock released"; exit 0' TERM INT
   
         # /scratch/crash is how the harness simulates the abnormal exit that
         # arms this fixture - see "HOW IT IS ARMED" above. Exiting here skips
         # the trap, so the lock survives into the next container start, which
         # is precisely what a kill -9 does.
         while true; do
           if [ -f /scratch/crash ]; then
             echo "abnormal termination; exiting without releasing $LOCK"
             exit 137
           fi
           sleep 2
         done
       command:
       - /bin/sh
       - -c
       image: busybox:1.37
       imagePullPolicy: IfNotPresent
       name: app
       resources:
         limits:
           cpu: 100m
           memory: 64Mi
         requests:
           cpu: 10m
           memory: 16Mi
       terminationMessagePath: /dev/termination-log
       terminationMessagePolicy: File
       volumeMounts:
       - mountPath: /scratch
         name: scratch
       - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
         name: kube-api-access-pzkdb
         readOnly: true
     dnsPolicy: ClusterFirst
     enableServiceLinks: true
     nodeName: hephaisto-e2e-control-plane
     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: {}
       name: scratch
     - name: kube-api-access-pzkdb
       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: 16Mi
     conditions:
     - lastTransitionTime: "2026-09-02T20:41:35Z"
       observedGeneration: 1
       status: "True"
       type: PodReadyToStartContainers
     - lastTransitionTime: "2026-09-02T20:41:34Z"
       observedGeneration: 1
       status: "True"
       type: Initialized
     - lastTransitionTime: "2026-09-02T21:08:17Z"
       message: 'containers with unready status: [app]'
       observedGeneration: 1
       reason: ContainersNotReady
       status: "False"
       type: Ready
     - lastTransitionTime: "2026-09-02T21:08:17Z"
       message: 'containers with unready status: [app]'
       observedGeneration: 1
       reason: ContainersNotReady
       status: "False"
       type: ContainersReady
     - lastTransitionTime: "2026-09-02T20:41:34Z"
       observedGeneration: 1
       status: "True"
       type: PodScheduled
     containerStatuses:
     - allocatedResources:
         cpu: 10m
         memory: 16Mi
       containerID: containerd://51316e23567b2bba076cf87e93ef57995dd11a5bcf9f90fc5ba0bc521ed71f88
       image: docker.io/library/busybox:1.37
       imageID: docker.io/library/busybox@sha256:9db7b59979c38555a39def84a31fb98b5296952f9e3afd4f6f11f05b07adfab0
       lastState:
         terminated:
           containerID: containerd://51316e23567b2bba076cf87e93ef57995dd11a5bcf9f90fc5ba0bc521ed71f88
           exitCode: 1
           finishedAt: "2026-09-02T21:08:17Z"
           reason: Error
           startedAt: "2026-09-02T21:08:17Z"
       name: app
       ready: false
       resources:
         limits:
           cpu: 100m
           memory: 64Mi
         requests:
           cpu: 10m
           memory: 16Mi
       restartCount: 10
       started: false
       state:
         waiting:
           message: back-off 5m0s restarting failed container=app pod=c13-wedged-lock-6778bccbd9-djhrb_hephaisto-chaos(fd804da2-0249-487f-8713-0afaa8a933d4)
           reason: CrashLoopBackOff
       user:
         linux:
           gid: 0
           supplementalGroups:
           - 0
           - 10
           uid: 0
       volumeMounts:
       - mountPath: /scratch
         name: scratch
       - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
         name: kube-api-access-pzkdb
         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: 100m
         memory: 64Mi
       requests:
         memory: 16Mi
     startTime: "2026-09-02T20:41:34Z"
   
   events for this pod:
   type     reason     count  objects                               first  last  message
   -------  ---------  -----  ------------------------------------  -----  ----  ------------------------------------------------------------------------------------------------
   Warning  BackOff    28     Pod/c13-wedged-lock-6778bccbd9-djhrb  6s     6s    Back-off restarting failed container app in pod c13-wedged-lock-6778bccbd9-djhrb_hephaisto-chao…
   Normal   Pulled     10     Pod/c13-wedged-lock-6778bccbd9-djhrb  4m     4m    Container image "busybox:1.37" already present on machine and can be accessed by the pod
   Normal   Created    9      Pod/c13-wedged-lock-6778bccbd9-djhrb  14m    14m   Container created
   Normal   Started    9      Pod/c13-wedged-lock-6778bccbd9-djhrb  14m    14m   Container started
   Normal   Pulled     1      Pod/c13-wedged-lock-6778bccbd9-djhrb  30m    30m   Successfully pulled image "busybox:1.37" in 673ms (5.743s including waiting). Image size: 19113…
   Normal   Pulling    1      Pod/c13-wedged-lock-6778bccbd9-djhrb  30m    30m   Pulling image "busybox:1.37"
   Normal   Scheduled  1      Pod/c13-wedged-lock-6778bccbd9-djhrb  30m    30m   Successfully assigned hephaisto-chaos/c13-wedged-lock-6778bccbd9-djhrb to hephaisto-e2e-control…
   

6. 6 tool get_pod kubernetes 2ms · 1.2 KiB

   arguments

   {"name": "c13-wedged-lock-6778bccbd9-djhrb", "namespace": "hephaisto-chaos"}

   result digest — what the model actually saw

   [step 01a063f7-7370-758c-94dd-7fe36c22dfce] get_pod
   log digest: 16 lines, 1248 bytes
   
   -- last 16 lines --
   pod hephaisto-chaos/c13-wedged-lock-6778bccbd9-djhrb
   phase: Running  node: hephaisto-e2e-control-plane  age: 31m
   
   conditions:
   type                       status  reason              message                                since
   -------------------------  ------  ------------------  -------------------------------------  -----
   PodReadyToStartContainers  True    -                   -                                      31m
   Initialized                True    -                   -                                      31m
   Ready                      False   ContainersNotReady  containers with unready status: [app]  4m
   ContainersReady            False   ContainersNotReady  containers with unready status: [app]  4m
   PodScheduled               True    -                   -                                      31m
   
   containers:
   container  ready  state    reason            restarts  last exit       image                           requests             limits
   ---------  -----  -------  ----------------  --------  --------------  ------------------------------  -------------------  --------------------
   app        no     waiting  CrashLoopBackOff  10        exit 1 (Error)  docker.io/library/busybox:1.37  cpu=10m,memory=16Mi  cpu=100m,memory=64Mi
   

7. 5 llm model turn internal 8.9s · 13.9k tok · $0.0004

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

   We have logs showing fatal startup lock held. The pod uses a lock file at /scratch/startup.lock, likely persisted via emptyDir volume named scratch? Let's see volume definition. Use get_pod to see container spec details.
   
   -> calls get_pod

8. 8 tool describe_pod kubernetes 5ms · 6.9 KiB ~ truncated

   arguments

   {"name": "c13-wedged-lock-6778bccbd9-djhrb", "namespace": "hephaisto-chaos"}

   result digest — what the model actually saw

   [step 01a063f7-a054-7cc5-8c74-edb1cd814f65] describe_pod
   log digest: 214 lines, 7073 bytes
   
   -- repeated patterns --
   x7 [#62 .. #199]         cpu: 100m
   x6 [#122 .. #191]     observedGeneration: 1
   x5 [#66 .. #202]         memory: 16Mi
   x3 [#60 .. #197]     resources:
   x3 [#61 .. #198]       limits:
   x3 [#63 .. #200]         memory: 64Mi
   x3 [#64 .. #201]       requests:
   x3 [#71 .. #183]       name: scratch
   x3 [#123 .. #143]     status: "True"
   x2 [#1 .. #113] apiVersion: v1
   
   -- notable lines --
         # container that did not exit cleanly. This process cannot tell that
         # from a lock a live process is holding, so it refuses to start.
         if [ -f "$LOCK" ]; then
           echo "FATAL: startup lock $LOCK is still held from an earlier run of this container; it is released only on a clean shutdown; refusing to start"
           exit 1
         fi
   
   
   -- last 40 lines --
         linux:
           gid: 0
           supplementalGroups:
           - 0
           - 10
           uid: 0
       volumeMounts:
       - mountPath: /scratch
         name: scratch
       - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
         name: kube-api-access-pzkdb
         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: 100m
         memory: 64Mi
       requests:
         memory: 16Mi
     startTime: "2026-09-02T20:41:34Z"
   
   events for this pod:
   type     reason     count  objects                               first  last  message
   -------  ---------  -----  ------------------------------------  -----  ----  ------------------------------------------------------------------------------------------------
   Warning  BackOff    28     Pod/c13-wedged-lock-6778bccbd9-djhrb  26s    26s   Back-off restarting failed container app in pod c13-wedged-lock-6778bccbd9-djhrb_hephaisto-chao…
   Normal   Pulled     10     Pod/c13-wedged-lock-6778bccbd9-djhrb  4m     4m    Container image "busybox:1.37" already present on machine and can be accessed by the pod
   Normal   Created    9      Pod/c13-wedged-lock-6778bccbd9-djhrb  14m    14m   Container created
   Normal   Started    9      Pod/c13-wedged-lock-6778bccbd9-djhrb  14m    14m   Container started
   Normal   Pulled     1      Pod/c13-wedged-lock-6778bccbd9-djhrb  31m    31m   Successfully pulled image "busybox:1.37" in 673ms (5.743s including waiting). Image size: 19113…
   Normal   Pulling    1      Pod/c13-wedged-lock-6778bccbd9-djhrb  31m    31m   Pulling image "busybox:1.37"
   Normal   Scheduled  1      Pod/c13-wedged-lock-6778bccbd9-djhrb  31m    31m   Successfully assigned hephaisto-chaos/c13-wedged-lock-6778bccbd9-djhrb to hephaisto-e2e-control…
   
   [truncated: 157 of 214 lines omitted]
   

   raw result — the untruncated tool output (6.9 KiB)

   apiVersion: v1
   kind: Pod
   metadata:
     creationTimestamp: "2026-09-02T20:41:34Z"
     generateName: c13-wedged-lock-6778bccbd9-
     generation: 1
     labels:
       app.kubernetes.io/name: c13-wedged-lock
       hephaisto.chaos/fault: transient
       hephaisto.chaos/scenario: c13
       pod-template-hash: 6778bccbd9
     name: c13-wedged-lock-6778bccbd9-djhrb
     namespace: hephaisto-chaos
     ownerReferences:
     - apiVersion: apps/v1
       kind: ReplicaSet
       blockOwnerDeletion: true
       controller: true
       name: c13-wedged-lock-6778bccbd9
       uid: 0b54776d-ffec-459c-aee3-d5adf8914e42
     uid: fd804da2-0249-487f-8713-0afaa8a933d4
   spec:
     containers:
     - args:
       - |
         LOCK=/scratch/startup.lock
   
         # A lock still present at startup was left by an earlier run of this
         # container that did not exit cleanly. This process cannot tell that
         # from a lock a live process is holding, so it refuses to start.
         if [ -f "$LOCK" ]; then
           echo "FATAL: startup lock $LOCK is still held from an earlier run of this container; it is released only on a clean shutdown; refusing to start"
           exit 1
         fi
   
         echo "$$" > "$LOCK"
         echo "startup lock $LOCK taken; serving"
   
         # Released on a clean shutdown, which is what makes an unclean one
         # leave it behind.
         trap 'rm -f "$LOCK"; echo "startup lock released"; exit 0' TERM INT
   
         # /scratch/crash is how the harness simulates the abnormal exit that
         # arms this fixture - see "HOW IT IS ARMED" above. Exiting here skips
         # the trap, so the lock survives into the next container start, which
         # is precisely what a kill -9 does.
         while true; do
           if [ -f /scratch/crash ]; then
             echo "abnormal termination; exiting without releasing $LOCK"
             exit 137
           fi
           sleep 2
         done
       command:
       - /bin/sh
       - -c
       image: busybox:1.37
       imagePullPolicy: IfNotPresent
       name: app
       resources:
         limits:
           cpu: 100m
           memory: 64Mi
         requests:
           cpu: 10m
           memory: 16Mi
       terminationMessagePath: /dev/termination-log
       terminationMessagePolicy: File
       volumeMounts:
       - mountPath: /scratch
         name: scratch
       - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
         name: kube-api-access-pzkdb
         readOnly: true
     dnsPolicy: ClusterFirst
     enableServiceLinks: true
     nodeName: hephaisto-e2e-control-plane
     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: {}
       name: scratch
     - name: kube-api-access-pzkdb
       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: 16Mi
     conditions:
     - lastTransitionTime: "2026-09-02T20:41:35Z"
       observedGeneration: 1
       status: "True"
       type: PodReadyToStartContainers
     - lastTransitionTime: "2026-09-02T20:41:34Z"
       observedGeneration: 1
       status: "True"
       type: Initialized
     - lastTransitionTime: "2026-09-02T21:08:17Z"
       message: 'containers with unready status: [app]'
       observedGeneration: 1
       reason: ContainersNotReady
       status: "False"
       type: Ready
     - lastTransitionTime: "2026-09-02T21:08:17Z"
       message: 'containers with unready status: [app]'
       observedGeneration: 1
       reason: ContainersNotReady
       status: "False"
       type: ContainersReady
     - lastTransitionTime: "2026-09-02T20:41:34Z"
       observedGeneration: 1
       status: "True"
       type: PodScheduled
     containerStatuses:
     - allocatedResources:
         cpu: 10m
         memory: 16Mi
       containerID: containerd://51316e23567b2bba076cf87e93ef57995dd11a5bcf9f90fc5ba0bc521ed71f88
       image: docker.io/library/busybox:1.37
       imageID: docker.io/library/busybox@sha256:9db7b59979c38555a39def84a31fb98b5296952f9e3afd4f6f11f05b07adfab0
       lastState:
         terminated:
           containerID: containerd://51316e23567b2bba076cf87e93ef57995dd11a5bcf9f90fc5ba0bc521ed71f88
           exitCode: 1
           finishedAt: "2026-09-02T21:08:17Z"
           reason: Error
           startedAt: "2026-09-02T21:08:17Z"
       name: app
       ready: false
       resources:
         limits:
           cpu: 100m
           memory: 64Mi
         requests:
           cpu: 10m
           memory: 16Mi
       restartCount: 10
       started: false
       state:
         waiting:
           message: back-off 5m0s restarting failed container=app pod=c13-wedged-lock-6778bccbd9-djhrb_hephaisto-chaos(fd804da2-0249-487f-8713-0afaa8a933d4)
           reason: CrashLoopBackOff
       user:
         linux:
           gid: 0
           supplementalGroups:
           - 0
           - 10
           uid: 0
       volumeMounts:
       - mountPath: /scratch
         name: scratch
       - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
         name: kube-api-access-pzkdb
         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: 100m
         memory: 64Mi
       requests:
         memory: 16Mi
     startTime: "2026-09-02T20:41:34Z"
   
   events for this pod:
   type     reason     count  objects                               first  last  message
   -------  ---------  -----  ------------------------------------  -----  ----  ------------------------------------------------------------------------------------------------
   Warning  BackOff    28     Pod/c13-wedged-lock-6778bccbd9-djhrb  26s    26s   Back-off restarting failed container app in pod c13-wedged-lock-6778bccbd9-djhrb_hephaisto-chao…
   Normal   Pulled     10     Pod/c13-wedged-lock-6778bccbd9-djhrb  4m     4m    Container image "busybox:1.37" already present on machine and can be accessed by the pod
   Normal   Created    9      Pod/c13-wedged-lock-6778bccbd9-djhrb  14m    14m   Container created
   Normal   Started    9      Pod/c13-wedged-lock-6778bccbd9-djhrb  14m    14m   Container started
   Normal   Pulled     1      Pod/c13-wedged-lock-6778bccbd9-djhrb  31m    31m   Successfully pulled image "busybox:1.37" in 673ms (5.743s including waiting). Image size: 19113…
   Normal   Pulling    1      Pod/c13-wedged-lock-6778bccbd9-djhrb  31m    31m   Pulling image "busybox:1.37"
   Normal   Scheduled  1      Pod/c13-wedged-lock-6778bccbd9-djhrb  31m    31m   Successfully assigned hephaisto-chaos/c13-wedged-lock-6778bccbd9-djhrb to hephaisto-e2e-control…
   

9. 10 tool describe_pod kubernetes 7ms · 6.9 KiB ~ truncated

   arguments

   {"name": "c13-wedged-lock-6778bccbd9-djhrb", "namespace": "hephaisto-chaos"}

   result digest — what the model actually saw

   [step 01a063f7-d35d-7c69-ac27-34af992aac3e] describe_pod
   log digest: 214 lines, 7073 bytes
   
   -- repeated patterns --
   x7 [#62 .. #199]         cpu: 100m
   x6 [#122 .. #191]     observedGeneration: 1
   x5 [#66 .. #202]         memory: 16Mi
   x3 [#60 .. #197]     resources:
   x3 [#61 .. #198]       limits:
   x3 [#63 .. #200]         memory: 64Mi
   x3 [#64 .. #201]       requests:
   x3 [#71 .. #183]       name: scratch
   x3 [#123 .. #143]     status: "True"
   x2 [#1 .. #113] apiVersion: v1
   
   -- notable lines --
         # container that did not exit cleanly. This process cannot tell that
         # from a lock a live process is holding, so it refuses to start.
         if [ -f "$LOCK" ]; then
           echo "FATAL: startup lock $LOCK is still held from an earlier run of this container; it is released only on a clean shutdown; refusing to start"
           exit 1
         fi
   
   
   -- last 40 lines --
         linux:
           gid: 0
           supplementalGroups:
           - 0
           - 10
           uid: 0
       volumeMounts:
       - mountPath: /scratch
         name: scratch
       - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
         name: kube-api-access-pzkdb
         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: 100m
         memory: 64Mi
       requests:
         memory: 16Mi
     startTime: "2026-09-02T20:41:34Z"
   
   events for this pod:
   type     reason     count  objects                               first  last  message
   -------  ---------  -----  ------------------------------------  -----  ----  ------------------------------------------------------------------------------------------------
   Warning  BackOff    28     Pod/c13-wedged-lock-6778bccbd9-djhrb  40s    40s   Back-off restarting failed container app in pod c13-wedged-lock-6778bccbd9-djhrb_hephaisto-chao…
   Normal   Pulled     10     Pod/c13-wedged-lock-6778bccbd9-djhrb  4m     4m    Container image "busybox:1.37" already present on machine and can be accessed by the pod
   Normal   Created    9      Pod/c13-wedged-lock-6778bccbd9-djhrb  14m    14m   Container created
   Normal   Started    9      Pod/c13-wedged-lock-6778bccbd9-djhrb  14m    14m   Container started
   Normal   Pulled     1      Pod/c13-wedged-lock-6778bccbd9-djhrb  31m    31m   Successfully pulled image "busybox:1.37" in 673ms (5.743s including waiting). Image size: 19113…
   Normal   Pulling    1      Pod/c13-wedged-lock-6778bccbd9-djhrb  31m    31m   Pulling image "busybox:1.37"
   Normal   Scheduled  1      Pod/c13-wedged-lock-6778bccbd9-djhrb  31m    31m   Successfully assigned hephaisto-chaos/c13-wedged-lock-6778bccbd9-djhrb to hephaisto-e2e-control…
   
   [truncated: 157 of 214 lines omitted]
   

   raw result — the untruncated tool output (6.9 KiB)

   apiVersion: v1
   kind: Pod
   metadata:
     creationTimestamp: "2026-09-02T20:41:34Z"
     generateName: c13-wedged-lock-6778bccbd9-
     generation: 1
     labels:
       app.kubernetes.io/name: c13-wedged-lock
       hephaisto.chaos/fault: transient
       hephaisto.chaos/scenario: c13
       pod-template-hash: 6778bccbd9
     name: c13-wedged-lock-6778bccbd9-djhrb
     namespace: hephaisto-chaos
     ownerReferences:
     - apiVersion: apps/v1
       kind: ReplicaSet
       blockOwnerDeletion: true
       controller: true
       name: c13-wedged-lock-6778bccbd9
       uid: 0b54776d-ffec-459c-aee3-d5adf8914e42
     uid: fd804da2-0249-487f-8713-0afaa8a933d4
   spec:
     containers:
     - args:
       - |
         LOCK=/scratch/startup.lock
   
         # A lock still present at startup was left by an earlier run of this
         # container that did not exit cleanly. This process cannot tell that
         # from a lock a live process is holding, so it refuses to start.
         if [ -f "$LOCK" ]; then
           echo "FATAL: startup lock $LOCK is still held from an earlier run of this container; it is released only on a clean shutdown; refusing to start"
           exit 1
         fi
   
         echo "$$" > "$LOCK"
         echo "startup lock $LOCK taken; serving"
   
         # Released on a clean shutdown, which is what makes an unclean one
         # leave it behind.
         trap 'rm -f "$LOCK"; echo "startup lock released"; exit 0' TERM INT
   
         # /scratch/crash is how the harness simulates the abnormal exit that
         # arms this fixture - see "HOW IT IS ARMED" above. Exiting here skips
         # the trap, so the lock survives into the next container start, which
         # is precisely what a kill -9 does.
         while true; do
           if [ -f /scratch/crash ]; then
             echo "abnormal termination; exiting without releasing $LOCK"
             exit 137
           fi
           sleep 2
         done
       command:
       - /bin/sh
       - -c
       image: busybox:1.37
       imagePullPolicy: IfNotPresent
       name: app
       resources:
         limits:
           cpu: 100m
           memory: 64Mi
         requests:
           cpu: 10m
           memory: 16Mi
       terminationMessagePath: /dev/termination-log
       terminationMessagePolicy: File
       volumeMounts:
       - mountPath: /scratch
         name: scratch
       - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
         name: kube-api-access-pzkdb
         readOnly: true
     dnsPolicy: ClusterFirst
     enableServiceLinks: true
     nodeName: hephaisto-e2e-control-plane
     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: {}
       name: scratch
     - name: kube-api-access-pzkdb
       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: 16Mi
     conditions:
     - lastTransitionTime: "2026-09-02T20:41:35Z"
       observedGeneration: 1
       status: "True"
       type: PodReadyToStartContainers
     - lastTransitionTime: "2026-09-02T20:41:34Z"
       observedGeneration: 1
       status: "True"
       type: Initialized
     - lastTransitionTime: "2026-09-02T21:08:17Z"
       message: 'containers with unready status: [app]'
       observedGeneration: 1
       reason: ContainersNotReady
       status: "False"
       type: Ready
     - lastTransitionTime: "2026-09-02T21:08:17Z"
       message: 'containers with unready status: [app]'
       observedGeneration: 1
       reason: ContainersNotReady
       status: "False"
       type: ContainersReady
     - lastTransitionTime: "2026-09-02T20:41:34Z"
       observedGeneration: 1
       status: "True"
       type: PodScheduled
     containerStatuses:
     - allocatedResources:
         cpu: 10m
         memory: 16Mi
       containerID: containerd://51316e23567b2bba076cf87e93ef57995dd11a5bcf9f90fc5ba0bc521ed71f88
       image: docker.io/library/busybox:1.37
       imageID: docker.io/library/busybox@sha256:9db7b59979c38555a39def84a31fb98b5296952f9e3afd4f6f11f05b07adfab0
       lastState:
         terminated:
           containerID: containerd://51316e23567b2bba076cf87e93ef57995dd11a5bcf9f90fc5ba0bc521ed71f88
           exitCode: 1
           finishedAt: "2026-09-02T21:08:17Z"
           reason: Error
           startedAt: "2026-09-02T21:08:17Z"
       name: app
       ready: false
       resources:
         limits:
           cpu: 100m
           memory: 64Mi
         requests:
           cpu: 10m
           memory: 16Mi
       restartCount: 10
       started: false
       state:
         waiting:
           message: back-off 5m0s restarting failed container=app pod=c13-wedged-lock-6778bccbd9-djhrb_hephaisto-chaos(fd804da2-0249-487f-8713-0afaa8a933d4)
           reason: CrashLoopBackOff
       user:
         linux:
           gid: 0
           supplementalGroups:
           - 0
           - 10
           uid: 0
       volumeMounts:
       - mountPath: /scratch
         name: scratch
       - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
         name: kube-api-access-pzkdb
         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: 100m
         memory: 64Mi
       requests:
         memory: 16Mi
     startTime: "2026-09-02T20:41:34Z"
   
   events for this pod:
   type     reason     count  objects                               first  last  message
   -------  ---------  -----  ------------------------------------  -----  ----  ------------------------------------------------------------------------------------------------
   Warning  BackOff    28     Pod/c13-wedged-lock-6778bccbd9-djhrb  40s    40s   Back-off restarting failed container app in pod c13-wedged-lock-6778bccbd9-djhrb_hephaisto-chao…
   Normal   Pulled     10     Pod/c13-wedged-lock-6778bccbd9-djhrb  4m     4m    Container image "busybox:1.37" already present on machine and can be accessed by the pod
   Normal   Created    9      Pod/c13-wedged-lock-6778bccbd9-djhrb  14m    14m   Container created
   Normal   Started    9      Pod/c13-wedged-lock-6778bccbd9-djhrb  14m    14m   Container started
   Normal   Pulled     1      Pod/c13-wedged-lock-6778bccbd9-djhrb  31m    31m   Successfully pulled image "busybox:1.37" in 673ms (5.743s including waiting). Image size: 19113…
   Normal   Pulling    1      Pod/c13-wedged-lock-6778bccbd9-djhrb  31m    31m   Pulling image "busybox:1.37"
   Normal   Scheduled  1      Pod/c13-wedged-lock-6778bccbd9-djhrb  31m    31m   Successfully assigned hephaisto-chaos/c13-wedged-lock-6778bccbd9-djhrb to hephaisto-e2e-control…
   

10. 9 llm model turn internal 13.1s · 15.5k tok · $0.0005

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

    -> calls describe_pod

11. 12 tool describe_pod kubernetes 5ms · 6.9 KiB ~ truncated

    arguments

    {"name": "c13-wedged-lock-6778bccbd9-djhrb", "namespace": "hephaisto-chaos"}

    result digest — what the model actually saw

    [step 01a063f7-f85e-7464-970c-867ca32d7601] describe_pod
    log digest: 214 lines, 7073 bytes
    
    -- repeated patterns --
    x7 [#62 .. #199]         cpu: 100m
    x6 [#122 .. #191]     observedGeneration: 1
    x5 [#66 .. #202]         memory: 16Mi
    x3 [#60 .. #197]     resources:
    x3 [#61 .. #198]       limits:
    x3 [#63 .. #200]         memory: 64Mi
    x3 [#64 .. #201]       requests:
    x3 [#71 .. #183]       name: scratch
    x3 [#123 .. #143]     status: "True"
    x2 [#1 .. #113] apiVersion: v1
    
    -- notable lines --
          # container that did not exit cleanly. This process cannot tell that
          # from a lock a live process is holding, so it refuses to start.
          if [ -f "$LOCK" ]; then
            echo "FATAL: startup lock $LOCK is still held from an earlier run of this container; it is released only on a clean shutdown; refusing to start"
            exit 1
          fi
    
    
    -- last 40 lines --
          linux:
            gid: 0
            supplementalGroups:
            - 0
            - 10
            uid: 0
        volumeMounts:
        - mountPath: /scratch
          name: scratch
        - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
          name: kube-api-access-pzkdb
          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: 100m
          memory: 64Mi
        requests:
          memory: 16Mi
      startTime: "2026-09-02T20:41:34Z"
    
    events for this pod:
    type     reason     count  objects                               first  last  message
    -------  ---------  -----  ------------------------------------  -----  ----  ------------------------------------------------------------------------------------------------
    Warning  BackOff    28     Pod/c13-wedged-lock-6778bccbd9-djhrb  49s    49s   Back-off restarting failed container app in pod c13-wedged-lock-6778bccbd9-djhrb_hephaisto-chao…
    Normal   Pulled     10     Pod/c13-wedged-lock-6778bccbd9-djhrb  4m     4m    Container image "busybox:1.37" already present on machine and can be accessed by the pod
    Normal   Created    9      Pod/c13-wedged-lock-6778bccbd9-djhrb  15m    15m   Container created
    Normal   Started    9      Pod/c13-wedged-lock-6778bccbd9-djhrb  15m    15m   Container started
    Normal   Pulled     1      Pod/c13-wedged-lock-6778bccbd9-djhrb  31m    31m   Successfully pulled image "busybox:1.37" in 673ms (5.743s including waiting). Image size: 19113…
    Normal   Pulling    1      Pod/c13-wedged-lock-6778bccbd9-djhrb  31m    31m   Pulling image "busybox:1.37"
    Normal   Scheduled  1      Pod/c13-wedged-lock-6778bccbd9-djhrb  31m    31m   Successfully assigned hephaisto-chaos/c13-wedged-lock-6778bccbd9-djhrb to hephaisto-e2e-control…
    
    [truncated: 157 of 214 lines omitted]
    

    raw result — the untruncated tool output (6.9 KiB)

    apiVersion: v1
    kind: Pod
    metadata:
      creationTimestamp: "2026-09-02T20:41:34Z"
      generateName: c13-wedged-lock-6778bccbd9-
      generation: 1
      labels:
        app.kubernetes.io/name: c13-wedged-lock
        hephaisto.chaos/fault: transient
        hephaisto.chaos/scenario: c13
        pod-template-hash: 6778bccbd9
      name: c13-wedged-lock-6778bccbd9-djhrb
      namespace: hephaisto-chaos
      ownerReferences:
      - apiVersion: apps/v1
        kind: ReplicaSet
        blockOwnerDeletion: true
        controller: true
        name: c13-wedged-lock-6778bccbd9
        uid: 0b54776d-ffec-459c-aee3-d5adf8914e42
      uid: fd804da2-0249-487f-8713-0afaa8a933d4
    spec:
      containers:
      - args:
        - |
          LOCK=/scratch/startup.lock
    
          # A lock still present at startup was left by an earlier run of this
          # container that did not exit cleanly. This process cannot tell that
          # from a lock a live process is holding, so it refuses to start.
          if [ -f "$LOCK" ]; then
            echo "FATAL: startup lock $LOCK is still held from an earlier run of this container; it is released only on a clean shutdown; refusing to start"
            exit 1
          fi
    
          echo "$$" > "$LOCK"
          echo "startup lock $LOCK taken; serving"
    
          # Released on a clean shutdown, which is what makes an unclean one
          # leave it behind.
          trap 'rm -f "$LOCK"; echo "startup lock released"; exit 0' TERM INT
    
          # /scratch/crash is how the harness simulates the abnormal exit that
          # arms this fixture - see "HOW IT IS ARMED" above. Exiting here skips
          # the trap, so the lock survives into the next container start, which
          # is precisely what a kill -9 does.
          while true; do
            if [ -f /scratch/crash ]; then
              echo "abnormal termination; exiting without releasing $LOCK"
              exit 137
            fi
            sleep 2
          done
        command:
        - /bin/sh
        - -c
        image: busybox:1.37
        imagePullPolicy: IfNotPresent
        name: app
        resources:
          limits:
            cpu: 100m
            memory: 64Mi
          requests:
            cpu: 10m
            memory: 16Mi
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
        volumeMounts:
        - mountPath: /scratch
          name: scratch
        - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
          name: kube-api-access-pzkdb
          readOnly: true
      dnsPolicy: ClusterFirst
      enableServiceLinks: true
      nodeName: hephaisto-e2e-control-plane
      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: {}
        name: scratch
      - name: kube-api-access-pzkdb
        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: 16Mi
      conditions:
      - lastTransitionTime: "2026-09-02T20:41:35Z"
        observedGeneration: 1
        status: "True"
        type: PodReadyToStartContainers
      - lastTransitionTime: "2026-09-02T20:41:34Z"
        observedGeneration: 1
        status: "True"
        type: Initialized
      - lastTransitionTime: "2026-09-02T21:08:17Z"
        message: 'containers with unready status: [app]'
        observedGeneration: 1
        reason: ContainersNotReady
        status: "False"
        type: Ready
      - lastTransitionTime: "2026-09-02T21:08:17Z"
        message: 'containers with unready status: [app]'
        observedGeneration: 1
        reason: ContainersNotReady
        status: "False"
        type: ContainersReady
      - lastTransitionTime: "2026-09-02T20:41:34Z"
        observedGeneration: 1
        status: "True"
        type: PodScheduled
      containerStatuses:
      - allocatedResources:
          cpu: 10m
          memory: 16Mi
        containerID: containerd://51316e23567b2bba076cf87e93ef57995dd11a5bcf9f90fc5ba0bc521ed71f88
        image: docker.io/library/busybox:1.37
        imageID: docker.io/library/busybox@sha256:9db7b59979c38555a39def84a31fb98b5296952f9e3afd4f6f11f05b07adfab0
        lastState:
          terminated:
            containerID: containerd://51316e23567b2bba076cf87e93ef57995dd11a5bcf9f90fc5ba0bc521ed71f88
            exitCode: 1
            finishedAt: "2026-09-02T21:08:17Z"
            reason: Error
            startedAt: "2026-09-02T21:08:17Z"
        name: app
        ready: false
        resources:
          limits:
            cpu: 100m
            memory: 64Mi
          requests:
            cpu: 10m
            memory: 16Mi
        restartCount: 10
        started: false
        state:
          waiting:
            message: back-off 5m0s restarting failed container=app pod=c13-wedged-lock-6778bccbd9-djhrb_hephaisto-chaos(fd804da2-0249-487f-8713-0afaa8a933d4)
            reason: CrashLoopBackOff
        user:
          linux:
            gid: 0
            supplementalGroups:
            - 0
            - 10
            uid: 0
        volumeMounts:
        - mountPath: /scratch
          name: scratch
        - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
          name: kube-api-access-pzkdb
          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: 100m
          memory: 64Mi
        requests:
          memory: 16Mi
      startTime: "2026-09-02T20:41:34Z"
    
    events for this pod:
    type     reason     count  objects                               first  last  message
    -------  ---------  -----  ------------------------------------  -----  ----  ------------------------------------------------------------------------------------------------
    Warning  BackOff    28     Pod/c13-wedged-lock-6778bccbd9-djhrb  49s    49s   Back-off restarting failed container app in pod c13-wedged-lock-6778bccbd9-djhrb_hephaisto-chao…
    Normal   Pulled     10     Pod/c13-wedged-lock-6778bccbd9-djhrb  4m     4m    Container image "busybox:1.37" already present on machine and can be accessed by the pod
    Normal   Created    9      Pod/c13-wedged-lock-6778bccbd9-djhrb  15m    15m   Container created
    Normal   Started    9      Pod/c13-wedged-lock-6778bccbd9-djhrb  15m    15m   Container started
    Normal   Pulled     1      Pod/c13-wedged-lock-6778bccbd9-djhrb  31m    31m   Successfully pulled image "busybox:1.37" in 673ms (5.743s including waiting). Image size: 19113…
    Normal   Pulling    1      Pod/c13-wedged-lock-6778bccbd9-djhrb  31m    31m   Pulling image "busybox:1.37"
    Normal   Scheduled  1      Pod/c13-wedged-lock-6778bccbd9-djhrb  31m    31m   Successfully assigned hephaisto-chaos/c13-wedged-lock-6778bccbd9-djhrb to hephaisto-e2e-control…
    

12. 11 llm model turn internal 9.5s · 16.4k tok · $0.0005

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

    -> calls describe_pod

13. 13 llm model turn internal 27.9s · 17.8k tok · $0.0006

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

    -> calls conclude

14. 14 tool conclude internal 0ms · 141 B

    arguments

    {"summary": "The pod crashes because its startup script finds a stale lock file in the persistent /scratch emptyDir volume; the lock is not cleared on crash, so each restart immediately aborts with exit code 1, leading to CrashLoopBackOff. Fix by removing the lock on container termination or using a non‑persistent location for the lock.", "findings": [{"primary": true, "category": "application", "evidence": [{"excerpt": "FATAL: startup lock /scratch/startup.lock is still held from an earlier run of this container; it is released only on a clean shutdown; refusing to start", "step_id": "01a063f7-2187-7cd0-9f1c-5642556aa140"}, {"excerpt": "if [ -f \"$LOCK\" ]; then\n        echo \"FATAL: startup lock $LOCK is still held from an earlier run of this container; it is released only on a clean shutdown; refusing to start\"\n        exit 1", "step_id": "01a063f7-508c-7823-b476-424c2bf7e766"}, {"excerpt": "app        no     waiting  CrashLoopBackOff  10        exit 1 (Error)  docker.io/library/busybox:1.37", "step_id": "01a063f7-7370-758c-94dd-7fe36c22dfce"}], "hypothesis": "The container's startup script checks for a lock file at /scratch/startup.lock and aborts if it exists; the lock persists in the pod's emptyDir volume across restarts, so after a crash the lock remains and the container repeatedly exits with code 1, causing CrashLoopBackOff."}], "confidence": 0.92}

    result digest — what the model actually saw

    [step 01a063f8-654f-775b-aa7b-e2a6612cf18f] 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.
    

15. 15 llm model turn internal 9.5s · 18.0k tok · $0.0006

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

    **Summary:**  
    The pod repeatedly crashes because its startup script aborts when it finds a stale lock file (`/scratch/startup.lock`). The lock lives in an `emptyDir` volume mounted at `/scratch`, which persists across container restarts within the same pod. After a previous run terminated unexpectedly, the lock remained, so each new container start immediately exits with code 1 and the pod enters CrashLoopBackOff.
    
    **Primary finding (confidence 0.92):**  
    - **Category:** `application`  
    - **Hypothesis:** The container’s entry‑point script checks for `/scratch/startup.lock`; if present it prints a fatal message and exits with status 1. Because the lock file is stored in a persistent emptyDir volume, it survives crashes, causing every restart to fail instantly and trigger CrashLoopBackOff.  
    
    **Evidence:**  
    - Log from previous container shows: `FATAL: startup lock /scratch/startup.lock is still held from an earlier run of this container; it is released only on a clean shutdown; refusing to start` (step 01a063f7‑2187‑7cd0‑9f1c‑5642556aa140).  
    - The pod’s script snippet (from `describe_pod`) contains the same fatal check and exit logic (step 01a063f7‑508c‑7823‑b476‑424c2bf7e766).  
    - Container status reports `exit 1 (Error)` with CrashLoopBackOff and 10 restarts (step 01a063f7‑7370‑758c‑94dd‑7fe36c22dfce).
    
    **Remediation:**  
    Remove the stale lock file (e.g., delete the pod or clear `/scratch/startup.lock`), or modify the application to clean up the lock on termination, or store the lock in a non‑persistent location so it does not survive container crashes. This will allow the container to start normally and stop the CrashLoopBackOff.

16. 16 llm model turn internal 41.2s · 8.1k tok · $0.0003

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

    {
      "summary": "The CrashLoopBackOff is caused by a stale lock file in the pod's emptyDir volume, which persists across restarts. Deleting the pod clears the emptyDir and removes the lock, allowing the container to start normally.",
      "no_action_required": false,
      "actions": [
        {
          "type": "RestartPod",
          "namespace": "hephaisto-chaos",
          "kind": "Pod",
          "name": "c13-wedged-lock-6778bccbd9-djhrb",
          "arguments_json": "{}",
          "predicted_effect": "The pod is deleted and a replacement pod is created with a fresh emptyDir; the stale /scratch/startup.lock file is gone, the container starts successfully, becomes Ready, and CrashLoopBackOff stops.",
          "rollback_json": "{\"description\": \"Delete the newly created pod to force another restart (no state is preserved). This does not restore the original lock but returns the workload to its prior failing state if the underlying issue persists.\"}",
          "evidence_finding_ids": [
            "01a063f8-8a94-7517-89ef-6ab7b4f2fe29"
          ],
          "risk": "Low"
        }
      ]
    }

findings 1

plan

The CrashLoopBackOff is caused by a stale lock file in the pod's emptyDir volume, which persists across restarts. Deleting the pod clears the emptyDir and removes the lock, allowing the container to start normally.

• RestartPod c13-wedged-lock-6778bccbd9-djhrb Low risk x deny

  The pod is deleted and a replacement pod is created with a fresh emptyDir; the stale /scratch/startup.lock file is gone, the container starts successfully, becomes Ready, and CrashLoopBackOff stops.

  • 31 % of the cluster is unhealthy: cluster-wide event, not a pod-level problem
  state Denied