The Ethereum scaling network, zkSync, suffered a major network outage on Christmas Day, causing the network to go offline for over 5 hours.
On December 25, the zkSync team announced that the network’s automated safety protocols were triggered due to a bug in the server. The incident caused the zkSync Era network to go down for hours at nearly 5:50 UTC.
The network came back online nearly five hours after the incident was reported. The zkSync developers team said that the bug was addressed, a fix was implemented, and the updated version of Node software was published immediately, even on holidays.
“The problem itself was a subtle—a relatively simple bug related to state updates,” said the team. “These are computed as part of the protocol, but since the operator is required to send them to L1, the node software also computes them.”
As said by the developers, the issue was with the network operator and not the protocol itself. The state computed by the protocol was “completely correct,” but “there was a subtle bug in the way the operator was also computing it.” Following this occurrence, the network went into defensive mode, causing an outage.
This is another major incident for the network this month, as zkSync Era also went through a block production halt on December 16.