Docker / Docker

Docker Daemon Panic: Crypto Hash Function Unavailable — Docker 29.4.1 Fix

Fix Docker daemon crash with panic: crypto: requested hash function #0 is unavailable in Docker 29.4.1 Includes evidence for Docker troubleshooting demand.

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

Category: Docker
Error signature: panic: crypto: requested hash function #0 is unavailable
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 Docker, 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

panic: crypto: requested hash function #0 is unavailable is a Docker failure pattern reported for developers trying to fix docker daemon crash with panic: crypto: requested hash function #0 is unavailable in docker 29.4.1. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

GitHub issue (2026-05-07) with full panic stack trace. Docker 29.4.1-specific regression. Exact error signature is the Go crypto panic message — highly distinctive and searchable.

Common causes

Docker daemon dies unexpectedly with a Go crypto panic in version 29.4.1, making containers completely unavailable. This is a critical infrastructure failure that blocks all Docker operations. The exact error string is highly specific and searchable.
GitHub issue (2026-05-07) with full panic stack trace. Docker 29.4.1-specific regression. Exact error signature is the Go crypto panic message — highly distinctive and searchable.

Quick fixes

Confirm the exact error signature matches panic: crypto: requested hash function #0 is unavailable.
Check the Docker 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 panic: crypto: requested hash function #0 is unavailable exactly before applying the quick fix.
Compare the failing environment with Docker 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 panic: crypto: requested hash function #0 is unavailable mean in Docker?

panic: crypto: requested hash function #0 is unavailable indicates the workflow described by "Docker Daemon Panic: Crypto Hash Function Unavailable — Docker 29.4.1 Fix" failed in a Docker context. Start by confirming the exact signature and the component that emitted it.

What should I check first for panic: crypto: requested hash function #0 is unavailable?

Check whether this cause matches your environment: Docker daemon dies unexpectedly with a Go crypto panic in version 29.4.1, making containers completely unavailable. This is a critical infrastructure failure that blocks all Docker operations. The exact error string is highly specific and searchable.

Is the panic: crypto: requested hash function #0 is unavailable guidance source-backed?

The "Docker Daemon Panic: Crypto Hash Function Unavailable — Docker 29.4.1 Fix" 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 panic: crypto: requested hash function #0 is unavailable?

For "Docker Daemon Panic: Crypto Hash Function Unavailable — Docker 29.4.1 Fix", 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 panic: crypto: requested hash function #0 is unavailable?

For "Docker Daemon Panic: Crypto Hash Function Unavailable — Docker 29.4.1 Fix", collect the failing Docker command or request, non-secret configuration, versions, timestamps, request IDs when available, and the smallest reproduction that still triggers the signature.