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Wang Yuan authored
If we enable diskless replication, set repl-diskless-sync-delay to 0, and master has non-rdb child process such as rewrite aof child, master will try to start to a new BGSAVE but fails immediately (before fork) when replicas ask for full synchronization, and master always fails to start a new BGSAVE and disconnects with replicas until non-rdb child process exists. this bug was introduced in #6271 (not yet released in 6.0.x)
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