“At the end of last year, our uptime was pretty shaky. You can see this trend on our status page, and that instability continued into the new year.”

Tailscale blog · Tailscale traces 16-year-old SQLite corruption bug to WAL-reset flaw

“We know our customers expect Tailscale to be a reliable service, and for several months we didn't live up to that promise. That's disruptive, and we're sorry.”

Tailscale blog · Tailscale traces 16-year-old SQLite corruption bug to WAL-reset flaw

“In total, we faced 19 separate instances of database corruption over six months before we finally resolved the underlying bug.”

Tailscale blog · Tailscale traces 16-year-old SQLite corruption bug to WAL-reset flaw

“SQLite corruption is possible, but it's highly unusual and not something you should encounter in normal operation.”

Tailscale blog · Tailscale traces 16-year-old SQLite corruption bug to WAL-reset flaw

“We funded the open-source SQLite VFS shim that helped isolate the race condition almost immediately, and will help track down similar bugs in the future.”

Tailscale blog · Tailscale traces 16-year-old SQLite corruption bug to WAL-reset flaw