Apache auth_digest:error No space left on device

My Apache machine just took a dump :( And on the restart it presented these errors: [auth_digest:notice] [pid 29978] AH01757: generating secret for digest authentication ... [core:emerg] [pid 29978] (28)No space left on device: AH00023: Couldn't create the authdigest-opaque mutex [auth_digest:error] [pid 29978] (28)No space left on device: AH01760: failed to create lock (opaque_lock) - all nonce-count checking, one-time nonces, and MD5-sess algorithm disabled [:emerg] [pid 29978] AH00020: Configuration Failed, exiting A quick check with tools like free and df show there is plenty of space on the system.

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