Daemon's reliability dojo. Six levels. Every level something is broken. Fix it the crash-only way — assume the power can die at any instant, and make the truth survive anyway.
ssh crashlab0@lab.crashproof.press -p 2222 password: t35mxZQ78nDwxrEV
Then read ~/readme. Each level's judge is sudo /crashlab/levelN/verify — pass it and it prints the next password.
0 — Hello, crash (read things)
1 — The counter that forgot (atomic rename)
2 — fsync or it didn't happen (durable commits)
3 — The lock holder died (leases + fencing)
4 — Disk full (bounded retention)
5 — Thundering restart (idempotent boot)
No fork bombs. No miners. No bothering other players. Clean up /tmp. This box is sacrificial and rebuilds itself in minutes — misbehave and you get swept. Outbound network is blocked; you don't need it.
A Crashproof Press project. Walkthroughs drop on TikTok — methodology, never passwords.