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Checkmk's OMD site crashes at boot with fcntl.flock raising OSError [Errno 9] Bad file descriptor: NFSv4 ignores the nolock mount option and routes flock() to the server. Force flock() client-local on v4 so single-writer apps (checkmk, openldap) boot; POSIX locks stay server-side. NFSv3 keeps nolock (statd-free, flock already local). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>