debug: add workflow to investigate flaky layer ordering tests#8645
Closed
debug: add workflow to investigate flaky layer ordering tests#8645
Conversation
Add a manually-triggered GitHub Actions workflow that runs test_download_two_layers 5 times with debug instrumentation to diagnose why layers sometimes return 'Layer1' instead of 'Layer2' on Docker (but not Finch). Instrumentation logs: - Layer ordering in download_all() input/output - Generated Dockerfile ADD command sequence - Tarball construction order - Image build vs reuse decisions
Instead of running isolated iterations, run the exact same pytest command as the CI local-invoke suite with added debug logging. This reproduces the real test ordering and cross-test interactions. Enhanced instrumentation now also captures: - Per-layer download decisions (cached vs fresh) - Extracted layer file contents after download - Docker build stream output (cache hits show as CACHED)
Run just the TestLayerVersion class instead of the full local-invoke suite. This covers the failing test_download_two_layers plus the other tests in the class that may cause cross-test contamination.
bnusunny
force-pushed
the
aws-sam-cli-tests
branch
from
8e8413d to
0316424
Compare
licjun
approved these changes
Feb 11, 2026
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Problem
The
test_download_two_layersintegration tests are flaky on Docker (but pass on Finch). They consistently return"Layer1"instead of"Layer2", suggesting a layer ordering/overlay issue specific to Docker daemon.Changes
workflow_dispatch) GitHub Actions workflow that runs the failing tests 5 times with debug instrumentationWhat the debug workflow captures
download_all()— input and output orderADDcommand sequenceHow to use
Once merged, trigger from Actions tab → "Debug Layer Order Tests" → Run workflow.
This is a temporary debug workflow — will be removed once the root cause is identified.