Fix Chrome sandbox failures in CI by updating test configuration and workflow by Copilot · Pull Request #48 · github/file-attachment-element

Copilot · 2025-11-25T21:49:23Z

The Node.js CI workflow was failing due to Chrome sandbox initialization errors on Ubuntu 23.10+ runners, where unprivileged user namespaces are disabled by default.

Changes

karma.config.js

Added custom Chrome launcher with sandbox-disabling flags (--no-sandbox, --disable-gpu, --disable-dev-shm-usage)
Improved chromium binary detection to handle missing npm package paths gracefully

.github/workflows/nodejs.yml

Enabled unprivileged user namespaces via sysctl before test execution
Updated actions to v4 and Node.js to 20.x (LTS)

// karma.config.js
customLaunchers: {
  ChromeHeadlessCI: {
    base: 'ChromeHeadless',
    flags: ['--no-sandbox', '--disable-gpu', '--disable-dev-shm-usage']
  }
}

Security Note: The --no-sandbox flag and sysctl change are standard practice for Chrome in containerized CI environments. See actions/runner-images#9621.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

accounts.google.com
- Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=network --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=3970 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-89943923 --change-stack-guard-on-fork=enable --shared-files=network_parent_dirs_pipe:100,v8_context_snapshot_data:101 --field-trial-handle=3,i,15167316132418396870,14596457868925568561,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
- Triggering command: /usr/bin/chromium-browser /usr/bin/chromium-browser --user-data-dir=/tmp/karma-89943923 --enable-automation --no-default-browser-check --no-first-run --disable-default-apps --disable-popup-blocking --disable-translate --disable-REDACTED-timer-throttling --disable-renderer-REDACTEDing --disable-device-discovery-notifications --no-sandbox --disable-gpu --disable-dev-shm-usage http://localhost:9876/?id=89943923 --headless --disable-gpu --disable-dev-shm-usage --remote-debugging-port=9222 (dns block)
- Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=4216 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-21567554 --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,1911390630848799663,14155344660997571127,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
clients2.google.com
- Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=network --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=3970 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-89943923 --change-stack-guard-on-fork=enable --shared-files=network_parent_dirs_pipe:100,v8_context_snapshot_data:101 --field-trial-handle=3,i,15167316132418396870,14596457868925568561,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
- Triggering command: /usr/bin/chromium-browser /usr/bin/chromium-browser --user-data-dir=/tmp/karma-89943923 --enable-automation --no-default-browser-check --no-first-run --disable-default-apps --disable-popup-blocking --disable-translate --disable-REDACTED-timer-throttling --disable-renderer-REDACTEDing --disable-device-discovery-notifications --no-sandbox --disable-gpu --disable-dev-shm-usage http://localhost:9876/?id=89943923 --headless --disable-gpu --disable-dev-shm-usage --remote-debugging-port=9222 (dns block)
- Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=4216 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-21567554 --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,1911390630848799663,14155344660997571127,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
clientservices.googleapis.com
- Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=4216 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-21567554 --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,1911390630848799663,14155344660997571127,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
- Triggering command: /opt/google/chrome/chrome /usr/bin/google-chrome --user-data-dir=/tmp/karma-21567554 --enable-automation --no-default-browser-check --no-first-run --disable-default-apps --disable-popup-blocking --disable-translate --disable-REDACTED-timer-throttling --disable-renderer-REDACTEDing --disable-device-discovery-notifications --no-sandbox --disable-gpu --disable-dev-shm-usage http://localhost:9876/?id=21567554 --headless --disable-gpu --disable-dev-shm-usage --remote-debugging-port=9222 (dns block)
- Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=4521 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-17498028 --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,909143507436331077,17578682525767971269,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
https://api.github.com//advisories
- Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (http block)
redirector.gvt1.com
- Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=network --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=3970 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-89943923 --change-stack-guard-on-fork=enable --shared-files=network_parent_dirs_pipe:100,v8_context_snapshot_data:101 --field-trial-handle=3,i,15167316132418396870,14596457868925568561,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
- Triggering command: /usr/bin/chromium-browser /usr/bin/chromium-browser --user-data-dir=/tmp/karma-89943923 --enable-automation --no-default-browser-check --no-first-run --disable-default-apps --disable-popup-blocking --disable-translate --disable-REDACTED-timer-throttling --disable-renderer-REDACTEDing --disable-device-discovery-notifications --no-sandbox --disable-gpu --disable-dev-shm-usage http://localhost:9876/?id=89943923 --headless --disable-gpu --disable-dev-shm-usage --remote-debugging-port=9222 (dns block)
- Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=4216 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-21567554 --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,1911390630848799663,14155344660997571127,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
safebrowsingohttpgateway.googleapis.com
- Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=4216 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-21567554 --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,1911390630848799663,14155344660997571127,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
- Triggering command: /opt/google/chrome/chrome /usr/bin/google-chrome --user-data-dir=/tmp/karma-21567554 --enable-automation --no-default-browser-check --no-first-run --disable-default-apps --disable-popup-blocking --disable-translate --disable-REDACTED-timer-throttling --disable-renderer-REDACTEDing --disable-device-discovery-notifications --no-sandbox --disable-gpu --disable-dev-shm-usage http://localhost:9876/?id=21567554 --headless --disable-gpu --disable-dev-shm-usage --remote-debugging-port=9222 (dns block)
- Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=4521 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-17498028 --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,909143507436331077,17578682525767971269,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
www.google.com
- Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=network --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=3970 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-89943923 --change-stack-guard-on-fork=enable --shared-files=network_parent_dirs_pipe:100,v8_context_snapshot_data:101 --field-trial-handle=3,i,15167316132418396870,14596457868925568561,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
- Triggering command: /usr/bin/chromium-browser /usr/bin/chromium-browser --user-data-dir=/tmp/karma-89943923 --enable-automation --no-default-browser-check --no-first-run --disable-default-apps --disable-popup-blocking --disable-translate --disable-REDACTED-timer-throttling --disable-renderer-REDACTEDing --disable-device-discovery-notifications --no-sandbox --disable-gpu --disable-dev-shm-usage http://localhost:9876/?id=89943923 --headless --disable-gpu --disable-dev-shm-usage --remote-debugging-port=9222 (dns block)
- Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --crashpad-handler-pid=4216 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/karma-21567554 --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,1911390630848799663,14155344660997571127,262144 --disable-features=PaintHolding --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
www.googleapis.com
- Triggering command: /usr/local/bin/node node install.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

Configure Actions setup steps to set up my environment, which run before the firewall is enabled
Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

The Node.js CI / build workflow on this repository is failing can you investigate?

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

Co-authored-by: jonrohan <54012+jonrohan@users.noreply.github.com>

Copilot

Pull request overview

This PR addresses Chrome sandbox initialization failures in CI environments running on Ubuntu 23.10+ runners by implementing a dual-approach fix: enabling unprivileged user namespaces at the system level and configuring Chrome to run with sandbox-disabling flags.

Key Changes:

Added custom Chrome launcher configuration with CI-specific flags (--no-sandbox, --disable-gpu, --disable-dev-shm-usage)
Updated GitHub Actions workflow to enable user namespaces and upgrade to latest action versions
Improved Chrome binary detection with graceful fallback handling

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
karma.config.js	Adds custom `ChromeHeadlessCI` launcher with sandbox-disabling flags and improves Chrome binary path detection with try-catch error handling
.github/workflows/nodejs.yml	Updates actions to v4, Node.js to 20.x LTS, and adds sysctl command to enable unprivileged user namespaces for Chrome sandbox support

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Copilot · 2025-12-02T21:01:25Z

.github/workflows/nodejs.yml

+    - name: Enable user namespaces
+      run: sudo sysctl -w kernel.unprivileged_userns_clone=1


The approach is contradictory: the workflow enables user namespaces to support Chrome's sandbox (line 16), but the Karma config disables the sandbox entirely with --no-sandbox (line 30).

If user namespaces are enabled, the sandbox should work without needing --no-sandbox. Consider either:

Remove the --no-sandbox flag and rely only on the sysctl setting

Remove the sysctl step and rely only on --no-sandbox

The current implementation works but maintains both workarounds unnecessarily, which could be confusing for future maintainers.

francinelucca · 2025-12-02T21:02:32Z

.github/workflows/nodejs.yml

+        node-version: '20.x'
+    # Enable unprivileged user namespaces for Chrome sandbox
+    # This is required because Ubuntu 23.10+ disables them by default
+    # See: https://github.com/actions/runner-images/issues/9621


confused about this issue link here

Initial plan

41fc7f0

Copilot AI assigned Copilot and jonrohan Nov 25, 2025

Copilot started work on behalf of jonrohan November 25, 2025 21:49 View session

Copilot AI and others added 3 commits November 25, 2025 21:52

Initial investigation of Node.js CI failure

1b12ff3

Co-authored-by: jonrohan <54012+jonrohan@users.noreply.github.com>

Fix Chrome sandbox issues in CI and update workflow

46f6bc7

Co-authored-by: jonrohan <54012+jonrohan@users.noreply.github.com>

Add documentation for sysctl security requirement

6ab549e

Co-authored-by: jonrohan <54012+jonrohan@users.noreply.github.com>

Copilot AI changed the title ~~[WIP] Investigate failing Node.js CI/build workflow~~ Fix Chrome sandbox failures in CI by updating test configuration and workflow Nov 25, 2025

Copilot AI requested a review from jonrohan November 25, 2025 22:03

Copilot finished work on behalf of jonrohan November 25, 2025 22:03

jonrohan marked this pull request as ready for review December 2, 2025 20:59

jonrohan requested a review from a team as a code owner December 2, 2025 20:59

Copilot AI review requested due to automatic review settings December 2, 2025 20:59

Copilot started reviewing on behalf of jonrohan December 2, 2025 21:00 View session

jonrohan enabled auto-merge December 2, 2025 21:00

Copilot finished reviewing on behalf of jonrohan December 2, 2025 21:01

Copilot AI reviewed Dec 2, 2025

View reviewed changes

francinelucca approved these changes Dec 2, 2025

View reviewed changes

jonrohan merged commit c490695 into main Dec 2, 2025
12 checks passed

jonrohan deleted the copilot/investigate-ci-build-failure branch December 2, 2025 21:02

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Fix Chrome sandbox failures in CI by updating test configuration and workflow#48

Fix Chrome sandbox failures in CI by updating test configuration and workflow#48
jonrohan merged 4 commits intomainfrom
copilot/investigate-ci-build-failure

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		- name: Enable user namespaces
		run: sudo sysctl -w kernel.unprivileged_userns_clone=1

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I tried to connect to the following addresses, but was blocked by firewall rules:

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Pull request overview

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Copilot AI commented Nov 25, 2025 •

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