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Base network halted for 116 minutes then 20 minutes due to a sequencer bug, affecting the $11 bn second‑largest Ethereum L2.
Base’s single‑sequencer architecture triggered two mainnet outages—first a 116‑minute halt on Thursday, then a 20‑minute pause on Friday—after a bug let “stale journal state” persist following an invalid transaction [1]. The disruptions underscore the fragility of centralized sequencer designs on high‑value rollups.
| At a glance | |
|---|---|
| Outage 1 duration | 116 minutes |
| Outage 2 duration | 20 minutes |
| Total value secured | ≈ $11 billion (2nd‑largest L2) |
| Root cause | Sequencer block‑builder bug & race condition |
Base’s engineering team traced the failures to a flaw in the sequencer’s block‑building logic. When an invalid transaction was executed, the journal state—holding accessed accounts and storage slots—was not cleared, leaving “stale” data that prevented the sequencer from advancing past the bad block [1]. A subsequent system reset introduced a race condition that stopped the sequencer from catching up, extending the second outage [1]. Because Base runs a single sequencer, the bug halted all new layer‑2 blocks and forced validator nodes to await manual intervention.
The team applied a patch that forces proper journal‑state updates during execution, restoring block production after each incident [1]. Mitigation took longer than expected due to “infrastructure conditions unrelated to the original bug,” highlighting operational dependencies beyond the code itself [1]. Going forward, Base plans to boost protocol fuzz testing—bombarding the system with malformed inputs—to surface similar bugs earlier, and to build “graceful recovery” mechanisms so validator nodes can resume without manual restarts [1].
Two back‑to‑back outages in a single week raise questions about the resilience of centralized sequencer models on high‑value rollups, especially as Base continues to secure near‑$11 billion in assets. The upcoming protocol hardening efforts will be a key test of whether the network can avoid similar disruptions without sacrificing throughput.
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AI-assisted synthesis by the TrendWatcher Editorial Desk · sourced from 2 outlets · Jun 28, 2026 · How we report
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