Starting from symptoms to structured reproduction
Users report problems in emotional language—stuck transactions, mysterious reverts—while engineers need structured inputs: chain id, EntryPoint address, UserOperation JSON, bundler endpoint, timestamps, and wallet version. The first step is to reproduce via the same bundler simulation RPC used in production because local eth_call shortcuts may omit validation rules. Save the returned error data and compare against on-chain execution traces when the operation eventually lands or fails. If the operation never lands, capture mempool decisions or bundler logs if available under privacy policies. IBEx Network ticket templates enforce these fields, reducing ping-pong between support and engineering. For high-severity incidents, spin up a fork at the block height of the failure to replay validation with identical state. Redact secrets from shared reproducers while preserving fields necessary to trigger the bug. Classify incidents as simulation mismatch, policy rejection, or economic non-inclusion to route owners quickly.
Trace reading and diffing techniques
Traces should be expanded through EntryPoint into account validateUserOp, paymaster hooks, and finally execution calls. Colorizing or annotating phases visually helps engineers unfamiliar with AA. Diff traces across environments by normalizing addresses and gas values that may legitimately differ slightly while highlighting opcode-level divergences. When a node upgrade causes divergence, compare precompile outputs and opcode costs in release notes. IBEx tooling sometimes integrates trace compression to share internally without exposing full user calldata. For modular accounts, annotate which module produced each subcall. Keep historical traces for regression baselines when contracts change rarely but nodes change often.
Fork replay automation and CI integration
Automated jobs can ingest anonymized UserOperation samples nightly and replay them on fresh forks to detect emerging divergences before users encounter them. CI should fail when traces differ from golden files beyond tolerances, prompting investigation. Maintain separate pipelines for L1 and major L2 nodes because client mixes differ. IBEx customers store reproducer corpora encrypted with access controls meeting their compliance regimes. When contracts upgrade, refresh golden traces deliberately rather than auto-accepting changes blindly. Performance tests ensure replay suites finish within acceptable wall clock time so teams actually run them.
Communication during live incidents
Status pages should distinguish bundler degradation from chain outages to set user expectations accurately. Provide estimated times to resolution and workaround steps such as switching bundlers when safe. Internal war rooms benefit from a single trace share link per incident to avoid forked investigations. Postmortems should include root cause category, detection gaps, and preventive tasks assigned with owners. IBEx liaison teams coordinate messaging with wallet partners when issues cross organizational boundaries. Legal may review public disclosures when PII could appear in traces; scrub diligently. Celebrate reductions in mean time to detect after improving simulation monitoring, not only mean time to fix.