GitHub 409 Error Solutions: Benchmark Testing Troubleshooting

Understanding the 409 Error

The HTTP 409 Conflict error can appear when running browser-based benchmarks, typically indicating resource conflicts or concurrent requests. This guide provides comprehensive troubleshooting steps to resolve 409 errors and get your benchmarks running smoothly.

Common Causes of 409 Errors

1. WebGL Context Conflicts

Multiple tabs or tests attempting to access the same WebGL context:

Error: Failed to create WebGL2 context (409 Conflict)
Cause: Another tab/window has exclusive GPU access

Quick Fix:
1. Close all other browser tabs with 3D content
2. Close other applications using GPU (games, video editors)
3. Refresh the benchmark page
4. Clear browser cache (Ctrl+Shift+Del)

2. Resource Locking Issues

Conflict Type	Symptom	Solution
GPU Context Lock	409 on test start	Restart browser, close GPU apps
Shader Compilation	409 during initialization	Update GPU drivers
Memory Allocation	409 mid-test	Close background apps, increase VRAM
Concurrent Tests	409 when multiple tests run	Run tests sequentially

Browser-Specific Solutions

Chrome / Edge (Chromium)

Method 1: Clear GPU Cache
1. Navigate to: chrome://settings/clearBrowserData
2. Select "Cached images and files"
3. Time range: "All time"
4. Click "Clear data"
5. Restart browser

Method 2: Reset GPU Settings
1. Navigate to: chrome://flags
2. Search: "GPU"
3. Reset all GPU-related flags to default
4. Restart browser

Method 3: Hardware Acceleration
1. Settings → Advanced → System
2. Toggle "Use hardware acceleration when available"
3. Restart browser

Method 4: Force GPU Process Restart
Open chrome://gpu
Click "Force GPU Process to Restart"

Firefox

Method 1: Refresh Firefox
Help → More Troubleshooting Information
Click "Refresh Firefox"
Reinstalls browser while keeping bookmarks

Method 2: WebGL Settings
1. Navigate to: about:config
2. Search: webgl.force-enabled
3. Set to: true
4. Search: webgl.disabled
5. Set to: false
6. Restart browser

Method 3: Clear Cache
Ctrl+Shift+Del
Select "Cache" and "Cookies"
Clear from "Everything"

Safari (macOS)

Method 1: Enable WebGL
Safari → Preferences → Advanced
Check "Show Develop menu"
Develop → Experimental Features → WebGL 2.0

Method 2: Clear Cache
Safari → Clear History
Time range: "All history"
Click "Clear History"

Method 3: Reset Safari
Close all Safari windows
Terminal command:
rm -rf ~/Library/Caches/com.apple.Safari
Restart Safari

System-Level Fixes

Windows Solutions

Solution 1: Update GPU Drivers
NVIDIA:
1. Download GeForce Experience
2. Drivers → Check for updates
3. Install latest Game Ready Driver
4. Restart PC

AMD:
1. Download AMD Software
2. Check for updates
3. Install latest Adrenalin driver
4. Restart PC

Intel:
1. Download Intel Driver & Support Assistant
2. Scan for updates
3. Install graphics driver
4. Restart PC

Solution 2: Windows Graphics Settings
Settings → System → Display → Graphics settings
Add browser exe (chrome.exe, firefox.exe)
Set to "High performance"
Restart browser

Solution 3: Disable Conflicting Software
Task Manager (Ctrl+Shift+Esc)
End processes:
- RGB control software (iCUE, Aura Sync)
- Recording software (OBS, ShadowPlay)
- Overlays (Discord, MSI Afterburner)
- Other browsers with WebGL content

macOS Solutions

Solution 1: Reset NVRAM/PRAM
1. Shut down Mac
2. Power on while holding: Cmd+Option+P+R
3. Release after 20 seconds
4. Mac will restart

Solution 2: Check GPU Activity
Activity Monitor → Window → GPU History
Look for processes using GPU
Quit unnecessary GPU-heavy apps

Solution 3: Verify Graphics Preference
System Preferences → Energy Saver
Uncheck "Automatic graphics switching" (MacBooks)
Forces use of discrete GPU

Linux Solutions

Solution 1: Update Mesa Drivers
Ubuntu/Debian:
sudo apt update
sudo apt upgrade mesa-utils libgl1-mesa-dri

Arch:
sudo pacman -Syu mesa

Fedora:
sudo dnf update mesa-*

Solution 2: Check WebGL Support
glxinfo | grep "OpenGL version"
firefox about:support (look for WebGL status)

Solution 3: Force GPU Selection
export DRI_PRIME=1  # Use discrete GPU
firefox &           # Launch with dedicated GPU

Advanced Troubleshooting

Developer Console Debugging

Open browser developer tools (F12) to identify the exact error:

Error Type 1: Context Creation Failed
Console: "WebGL2 context creation failed (409)"

Fix Steps:
1. Check WebGL support: visit webglreport.com
2. Verify GPU not blacklisted
3. Update browser to latest version
4. Try different browser as fallback

Error Type 2: Shader Compilation Error
Console: "Shader program linking failed (409)"

Fix Steps:
1. Update GPU drivers (critical)
2. Check GPU temperature (overheating)
3. Test with simpler benchmark first
4. Disable GPU overclocking if active

Error Type 3: Memory Allocation Error
Console: "Failed to allocate GPU memory (409)"

Fix Steps:
1. Close other GPU-intensive applications
2. Reduce benchmark resolution/quality
3. Check available VRAM (use GPU-Z)
4. Restart browser to free leaked memory

Network-Related 409 Errors

Error Message	Cause	Solution
"Asset loading conflict"	CDN caching issue	Hard refresh (Ctrl+F5), clear DNS cache
"Session ID conflict"	Duplicate session	Clear cookies, start new incognito session
"Result submission conflict"	Concurrent submission	Wait 30 seconds, retry once

Preventing Future 409 Errors

Best Practices Checklist

Before Running Benchmarks:
☑ Close unnecessary browser tabs
☑ Exit GPU-intensive applications
☑ Disable browser extensions (use incognito mode)
☑ Ensure latest GPU drivers installed
☑ Check GPU temperature (should be <75°C idle)
☑ Verify adequate VRAM available (4GB+ free)
☑ Use primary/integrated GPU browser if testing dedicated
☑ Disable hardware acceleration in other apps

During Benchmarks:
☑ Don't switch tabs
☑ Don't start other GPU tasks
☑ Keep browser window active (not minimized)
☑ Disable screen savers/lock screen

Browser Configuration:
☑ Enable hardware acceleration
☑ Allow WebGL on benchmark site
☑ Disable strict security extensions
☑ Clear cache weekly

Alternative Solutions

If 409 Errors Persist

Option 1: Try Different Browser
Primary: Chrome → Firefox
Secondary: Firefox → Edge
Fallback: Safari (macOS) or Chromium

Option 2: Use Incognito/Private Mode
Disables extensions that may conflict
Fresh session without cached state
Ctrl+Shift+N (Chrome/Edge)
Ctrl+Shift+P (Firefox)
Cmd+Shift+N (Safari)

Option 3: Create Dedicated Browser Profile
Chrome:
chrome://settings/people → Add Person
Use dedicated profile for benchmarks only

Firefox:
about:profiles → Create New Profile
Minimal extensions, optimized for performance

Option 4: Reduce Test Complexity
Start with basic rendering test
Gradually increase to complex tests
Helps identify which test triggers conflict

Option 5: Contact Support
If none of the above work:
1. Visit benchmark site's GitHub issues
2. Provide: Browser version, GPU model, OS
3. Include developer console error log
4. Attach screenshot of error

Conclusion: Resolving 409 Errors

Most 409 errors stem from GPU resource conflicts and can be resolved with these approaches:

• ✓ Quick fix (90% of cases): Close other tabs/apps, restart browser
• ✓ Driver issues: Update GPU drivers to latest version
• ✓ Browser conflicts: Clear cache, try incognito mode
• ✓ System-level: Disable conflicting software, verify GPU selection
• ✓ Persistent issues: Try different browser, create dedicated profile

Troubleshooting Priority:

1. Close other GPU applications → 60% success rate
2. Restart browser with cache clear → 20% success rate
3. Update GPU drivers → 10% success rate
4. Try different browser → 8% success rate
5. Advanced system troubleshooting → 2% success rate

If errors continue after all solutions, the issue may be hardware-related (failing GPU, overheating) or a known compatibility problem with your specific GPU model. Check the benchmark site's compatibility list and known issues page.