Supersim autorelay flakes

[tremarkley]

Occasionally when messages are relayed using supersim they return the following error:

execution reverted: custom error 0xb7d09497

This signature corresponds to the InvalidTimestamp error when validating the cross chain message inside the CrossL2Inbox: https://github.com/ethereum-optimism/optimism/blob/cbfb97ede9d8ab4da2e3c4ef65ac8e366ad5f422/packages/contracts-bedrock/src/L2/CrossL2Inbox.sol#L192

This is most likely due to a race condition involving different timestamps between two l2s. This is also causing flakes on several of the tests that rely on relaying messages (e.g. TestCrosschainETHTransfer)

[s29papi]

@tremarkley I want to take on this. Appreciate if assigned to me.

[tremarkley]

@s29papi assigned to you

[s29papi]

Hey @tremarkley,

I've been trying to trace back from the error point to identify a good starting point in the code to address this issue, but the nature of the bug has made it quite challenging. However, I am still eager to tackle it.

Regarding your comment about the potential race condition involving different timestamps between the two L2s, I wanted to ask if you think this could be related to the processEventLog function in the interop indexer. I noticed that the source L2 timestamp is passed there, and I'm curious if you believe this could be a contributing factor.

Could you provide more details on where you think this issue might be originating from? I would like to review the relevant code to see if I can spot the problem directly. Any insights you can share would be incredibly helpful in guiding my investigation.

Thank you!