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The simulator returns "no state found for block <hash>" when its node knows the parent header but does not have that block on its head chain. A late parent, a reorg, or a lagging node causes this. `is_temporary` did not match the text, so the relay demoted the builder for a sim-side condition. Match the reth text and the builder's own "parent state is not available". Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
vladimir-ea
approved these changes
Sep 14, 2026
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Issue: none (small bug fix; say the word and I draft one)
What this PR does
The simulator returns
no state found for block <hash>when its node knows the parent header but does not have that block on its head chain (state_by_block_hashincrates/simulator/src/validation/mod.rs). A late parent block, a reorg, or a lagging node causes this.BlockSimError::is_temporarydid not match the text, sois_demotablereturnedtrueand the relay demoted the builder for a sim-side condition. This was seen on mainnet FR, slot 15185181, builder Titan.The fix matches the reth text with
starts_with, because the message carries the parent hash. It also matches our own builder validator'sparent state is not available, which is the same condition.What this PR deliberately does not do
It does not change the retry or pause behaviour: a temporary error already pauses the simulator tile and the submission retries. It does not touch the simulator node's own head-chain tracking, and it does not remove any past demotion from the database.
Tests
missing_parent_state_never_demotesincrates/common/src/simulator.rsholds the invariant: both texts are temporary and not demotable. The test came before the match arms. The change is a one-line-per-text classification fix, so no new integration test.Reviewer checklist
lint,unit-test) is green🤖 Generated with Claude Code