Submitted by WatchPug, also found by gzeon.
https://github.com/livepeer/arbitrum-lpt-bridge/blob/ebf68d11879c2798c5ec0735411b08d0bea4f287/contracts/L1/gateway/L1Migrator.sol#L308-L310
L1Migrator.sol#migrateETH() will call IBridgeMinter(bridgeMinterAddr).withdrawETHToL1Migrator() to withdraw ETH from BridgeMinter.
However, the current implementation of L1Migrator is unable to receive ETH.
https://github.com/livepeer/protocol/blob/20e7ebb86cdb4fe9285bf5fea02eb603e5d48805/contracts/token/BridgeMinter.sol#L94-L94
A contract receiving Ether must have at least one of the functions below:
receive() is called if msg.data is empty, otherwise fallback() is called.
Because L1Migrator implement neither receive() or fallback(), the call at L94 will always revert.
All the ETH held by the BridgeMinter can get stuck in the contract.
Add receive() external payable {} in L1Migrator.
yondonfu (Livepeer) confirmed and disagreed with severity:
yondonfu (Livepeer) resolved:
0xleastwood (judge) commented:
