A validator operator reported that "It appears a misconfigured node caused an unrecoverable partition in the network." It's a bit startling that, in a supposedly decentralized network, one single node can bring the entire network offline.
OptiFi has promised to return user deposits and settle all positions. In a post-mortem, they wrote that they had learned that "Every deployment needs a rigorous process and single point failure can be avoided. Please don't rush like what we did, especially for defi projects". They further outlined a "peer-surveillance approach" in which three people would be required to deploy any changes together. They also asked the Solana team to implement a two-step confirmation for such a potentially destructive command.
However, Solana has been plagued with stability issues, and on June 1 it was taken offline by its developers for what CryptoWhale says was the eighth time this year. This occurred only days after an incident in which the Solana blockchain clock drifted significantly behind real-world time.
Blockchain timekeeping is also selling point of Solana, which talks up its "proof of history" algorithm in a blog post where Solana Labs co-founder Anatoly Yakovenko says, "our clocks never drift".
This is hardly the first instability the network has demonstrated, much to the chagrin of its users. Transaction flooding is an issue on Solana in part because of the low transaction fees compared to networks like Bitcoin and Ethereum, which have relatively high gas fees that would make flooding extremely expensive.