Ollama / Ollama

Ollama MLX Runner 10s Watchdog Timeout on Mac with Large Context — Fix Guide

Fix Ollama MLX runner being killed by 10-second watchdog timeout when processing large context windows on Apple Silicon Mac Includes evidence for Ollama troubleshooting demand.

Source-backed Last updated May 13, 2026 1 source Needs local verification

Category: Ollama
Error signature: [Mac/MLX] MLX Runner killed by 10s watchdog timeout during large context prefill
Quick fix: Compare the failing environment with a known working setup, then change one configuration value at a time.
Updated: May 13, 2026
Verification status: Source-backed
Evidence: 1 public source URL

Before you change production

This page includes public source URLs in the imported troubleshooting record. Compare those references with your version and environment before applying changes.

Reproduce the smallest failing action and save non-secret logs before changing configuration.
Check versions for Ollama, related SDKs, package managers, CI runners, and hosting providers.
Change one setting or dependency at a time, then rerun the same failing command or request.
Avoid destructive commands, credential rotation, billing changes, or security relaxations without a rollback plan.

What this error means

[Mac/MLX] MLX Runner killed by 10s watchdog timeout during large context prefill is a Ollama failure pattern reported for developers trying to fix ollama mlx runner being killed by 10-second watchdog timeout when processing large context windows on apple silicon mac. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

GitHub issue (2026-05-10) with detailed logs showing watchdog timeout regression. Specific to Apple Silicon MLX runner with large context windows. Affects popular use case (long-context LLM inference).

Common causes

Since Ollama v0.23.1/v0.23.2, the MLX runner on Apple Silicon Macs is terminated by a strict 10-second heartbeat timeout during large context prefill (32k+ tokens) or slow-prefill MoE models. This causes 500 Internal Server Error, completely blocking long-context operations. v0.22.1 works fine — this is a regression.
GitHub issue (2026-05-10) with detailed logs showing watchdog timeout regression. Specific to Apple Silicon MLX runner with large context windows. Affects popular use case (long-context LLM inference).

Quick fixes

Confirm the exact error signature matches [Mac/MLX] MLX Runner killed by 10s watchdog timeout during large context prefill.
Check the Ollama account, local tool state, and provider configuration involved in the failing workflow.
Compare the failing environment with a known working setup, then change one configuration value at a time.

Platform/tool-specific checks

Verify the command, editor, extension, or API client that produced the error.
Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

Capture the exact error message and the command, editor action, or request that triggered it.
Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
Review the source evidence below and compare it with your environment.
Apply one change at a time and rerun the smallest failing action.
Keep the working fix documented for the team or deployment environment.

How to prevent it

Keep provider/tool configuration documented.
Record non-secret diagnostics such as tool version, provider name, model name, and command path.
Add a lightweight check before CI or production workflows depend on the tool.

Diagnostic flow for this page

Match [Mac/MLX] MLX Runner killed by 10s watchdog timeout during large context prefill exactly before applying the quick fix.
Compare the failing environment with Ollama versions, account scope, provider settings, and deployment context.
Check the listed common causes in order, starting with the cause that best matches your logs.
Use the evidence status below to decide whether to confirm against public sources or official documentation.
Apply one reversible change, rerun the smallest failing action, and keep rollback notes.

FAQ

What does [Mac/MLX] MLX Runner killed by 10s watchdog timeout during large context prefill mean in Ollama?

[Mac/MLX] MLX Runner killed by 10s watchdog timeout during large context prefill indicates the workflow described by "Ollama MLX Runner 10s Watchdog Timeout on Mac with Large Context — Fix Guide" failed in a Ollama context. Start by confirming the exact signature and the component that emitted it.

What should I check first for [Mac/MLX] MLX Runner killed by 10s watchdog timeout during large context prefill?

Check whether this cause matches your environment: Since Ollama v0.23.1/v0.23.2, the MLX runner on Apple Silicon Macs is terminated by a strict 10-second heartbeat timeout during large context prefill (32k+ tokens) or slow-prefill MoE models. This causes 500 Internal Server Error, completely blocking long-context operations. v0.22.1 works fine — this is a regression.

Is the [Mac/MLX] MLX Runner killed by 10s watchdog timeout during large context prefill guidance source-backed?

The "Ollama MLX Runner 10s Watchdog Timeout on Mac with Large Context — Fix Guide" page is labeled source-backed. It has 1 public source URL from github.com, so use that evidence status when deciding how much additional verification you need.

When should I avoid the quick fix for [Mac/MLX] MLX Runner killed by 10s watchdog timeout during large context prefill?

For "Ollama MLX Runner 10s Watchdog Timeout on Mac with Large Context — Fix Guide", avoid applying "Compare the failing environment with a known working setup, then change one configuration value at a time." when the error text differs, the affected version or provider is different, or the change would touch credentials, billing, DNS, production deploy settings, or irreversible data.

What should I collect before debugging [Mac/MLX] MLX Runner killed by 10s watchdog timeout during large context prefill?

For "Ollama MLX Runner 10s Watchdog Timeout on Mac with Large Context — Fix Guide", collect the failing Ollama command or request, non-secret configuration, versions, timestamps, request IDs when available, and the smallest reproduction that still triggers the signature.