LLM Systems

DeepSeek model loading timeout during simultaneous startup in US-East and EU-West

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Problem Description When launching DeepSeek model instances simultaneously in us-east-1 and eu-west-2, the service reports a loading failure after exactly 30 seconds. The error appears in the application logs of every affected pod: ModelLoadingError: Timeout after 30000ms while fetching model file from remote storage. ConnectionError: Failed to download model checkpoint – request timed out (status code … Read more

GPU OOM during GPT-4o fine‑tuning with large batch size

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Problem Description During fine‑tuning of the OpenAI GPT‑4o model on a single GPU (e.g., A100 40 GiB, RTX 4090 24 GiB), the training loop crashes with a CUDA out‑of‑memory (OOM) error when the batch size or sequence length is increased. A typical failure looks like: RuntimeError: CUDA out of memory. Tried to allocate 12.34 GiB (GPU 0; 24.00 … Read more

Meta LLaMA batch inference failures after intermittent cloud API timeouts

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Problem: Meta LLaMA Batch Inference Fails After Intermittent Cloud API Timeouts In a production pipeline that runs large‑scale batch inference on Meta LLaMA, jobs started to abort after a few hundred input files were processed. The failure manifested as unhandled exceptions during both the input fetch phase (cloud storage read) and the result upload phase … Read more

GPT-3.5 token limit exceeded after adding new user turn

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Problem Description Symptoms and Impact During development of a multi‑turn chatbot that uses the OpenAI GPT‑3.5‑turbo model, the API began returning errors after adding a new user turn. Typical log entries looked like: 2024-09-14 10:22:31,842 ERROR openai.error.InvalidRequestError: This model’s maximum context length is 4097 tokens Traceback (most recent call last): File “app.py”, line 112, in … Read more

Google Gemini SAML assertion invalid error during inter‑service call

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Problem Description Microservices that run on GKE, Cloud Run, or Cloud Functions invoke the Google Gemini API using SAML‑based workload identity federation. During inter‑service calls the Gemini client returns: SAML Assertion is invalid: Expired or SAML Assertion is invalid: Audience mismatch These errors prevent the services from authenticating to Gemini, causing request failures such as … Read more

Claude API authentication failures after secret rotation in staging CI/CD

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Problem Description – Claude API Authentication Failures After Secret Rotation in Staging CI/CD During nightly staging deployments the integration test suite intermittently receives 401 Unauthorized – “Invalid API key” or 403 Forbidden – “API key expired or revoked” responses from the Anthropic Claude endpoint. The failure correlates with the automated secret‑rotation step that fetches a … Read more

GPT-4o RAG citation format error after adding GPU node

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Problem Description After adding a fourth GPU node to a distributed inference cluster for OpenAI GPT‑4o with Retrieval‑Augmented Generation (RAG), the citations field in the model response became malformed. Typical symptoms observed in production logs include: JSON parsing errors such as “Error parsing citation: unexpected token ””. Missing or truncated brackets in the citation array, … Read more

Admission controller rejection of GPT-4 pod missing securityContext in canary

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Problem – Admission Controller Rejects GPT‑4 Canary Pods During a staged rollout of a new GPT‑4 inference service, the canary pods never reach the Running state. The Kubernetes API server returns a 403 error from the pod-security-admission webhook and a custom model‑policy webhook. Typical log excerpts look like: Error from server (Forbidden): admission webhook “pod-security-admission” … Read more

RAG metadata filter excludes relevant docs after region replication lag

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Problem Description In a multi‑region deployment of a Retrieval‑Augmented Generation (RAG) pipeline, the metadata filter applied during vector retrieval is dropping documents that are actually relevant. The symptom is an empty or severely reduced result set after the filter step, leading to incomplete or inaccurate answers from the GPT‑4o model. Typical error messages observed in … Read more

Google Gemini logprob NaN after network latency spike in hybrid cloud

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Problem Description During inference with the Google Gemini model in a hybrid‑cloud deployment, the logprob field in the response payload intermittently contains NaN or null values. The symptom manifests as: Inconsistent token scoring – generated text appears correct, but downstream ranking logic that relies on log probabilities fails. API errors such as HTTP 400 with … Read more