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Control connection timeout causes 100% CPU usage #429
We have been scanning our FTP servers with Nessus and frequently after a batch of scans have been run, the FTP server will be using 100% on Linux. An strace reveals that it is very rapidly attempting to poll one or more sockets (depending on how many are stuck).
In the FTPD logs, all other connections by
Sorry for the big delay in responding. Was there any progress about this? You can try running the server with DEBUG logging enabled:
Hopefully that may give some hints about what syscall the busy loop keeps calling. It should be either send() or recv() failing with a certain error code.