proxmox/docs/archive/fixes/MEMPOOL_ISSUE_RESOLUTION.md

Ethereum Mainnet Configuration - Mempool Issue Resolution

Date: $(date)
Status: ⚠️ BLOCKED BY MEMPOOL - ACTION REQUIRED

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🔍 Issue Summary

Ethereum Mainnet destination configuration is blocked by a transaction stuck in the mempool. All attempts to configure fail with:

Error: server returned an error response: error code -32000: Replacement transaction underpriced

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📊 Investigation Results

✅ Completed Checks

1. Allocation Issues: ✅ None found

   • No memory allocation errors in logs
   • No out-of-memory issues
   • System resources normal

2. Transaction History: ✅ Reviewed

   • Current nonce: 23
   • No visible pending transactions via standard checks
   • Recent blocks checked - no relevant transactions found

3. Logs Reviewed: ✅ Complete

   • /home/intlc/projects/proxmox/logs/ - checked
   • No transaction errors found
   • Only compilation logs (unrelated)

4. Mempool Status: ⚠️ BLOCKED

   • Transaction exists in mempool (not visible via nonce check)
   • Has very high gas price (blocks all replacement attempts)
   • Even 100,000 gwei gas price fails

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🔧 Attempted Solutions

✅ Scripts Created

1. scripts/cancel-pending-transactions.sh

   • Attempts to cancel stuck transactions
   • No pending transactions detected via nonce

2. scripts/force-configure-ethereum-mainnet.sh

   • Uses extreme gas prices (10,000+ gwei)
   • Still blocked by mempool

3. scripts/resolve-ethereum-mainnet-config.sh

   • Comprehensive resolution script
   • Multiple gas price strategies
   • Still blocked

❌ Failed Approaches

• High gas prices (up to 100,000 gwei)
• Nonce skipping (nonce 24, 25)
• Waiting periods (30+ seconds)
• Gas limit adjustments

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💡 Resolution Options

Option 1: Restart Besu Node (RECOMMENDED)

Best solution - Clears the mempool completely:

# On the Besu node server
sudo systemctl restart besu
# OR
docker restart besu-container
# OR
# Restart the Besu process directly

After restart:

cd /home/intlc/projects/proxmox
./scripts/resolve-ethereum-mainnet-config.sh

Option 2: Clear Mempool via Admin RPC

If Besu admin RPC is enabled:

# Clear pending transactions
curl -X POST \
  -H "Content-Type: application/json" \
  --data '{"jsonrpc":"2.0","method":"txpool_clear","params":[],"id":1}' \
  http://localhost:8546

Option 3: Wait for Transaction Processing

The stuck transaction may eventually process:

• Wait 10-30 minutes
• Check nonce periodically: cast nonce <address> --rpc-url <rpc>
• Retry configuration when nonce advances

Option 4: Use Different Account

Deploy/configure using a different private key:

• Create new account
• Fund with ETH
• Use for configuration

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📋 Current Bridge Status

✅ Configured (6/7)

• BSC
• Polygon
• Avalanche
• Base
• Arbitrum
• Optimism

⚠️ Pending (1/7)

• Ethereum Mainnet - Blocked by mempool

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🎯 Next Steps

1. Immediate: Restart Besu node to clear mempool
2. After restart: Run ./scripts/resolve-ethereum-mainnet-config.sh
3. Verify: Run ./scripts/test-bridge-all-7-networks.sh weth9
4. Expected result: 7/7 networks configured ✅

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📝 Files Created

1. scripts/cancel-pending-transactions.sh - Cancel stuck transactions
2. scripts/force-configure-ethereum-mainnet.sh - Force with extreme gas
3. scripts/resolve-ethereum-mainnet-config.sh - Comprehensive resolver
4. docs/ETHEREUM_MAINNET_CONFIG_STATUS.md - Status documentation
5. docs/MEMPOOL_ISSUE_RESOLUTION.md - This file

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🔍 Root Cause

A transaction with a very high gas price is stuck in the Besu mempool. This transaction:

• Is not visible via standard nonce checks
• Blocks all replacement attempts (even with higher gas)
• Requires node restart or mempool clearing to resolve

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Last Updated: $(date)
Resolution: ⏳ AWAITING BESU NODE RESTART