The issue is fixed in this patch:
https://src.fedoraproject.org/rpms/vsftpd/raw/main/f/0026-Prevent-hanging-in-SIGCHLD-handler.patch
It applies flawlessly to the debian version of vsftpd.
Package: vsftpd
Version: version 3.0.3
Description:
It seems vsftpd blocks/hang if you use a PAM module which call a subprocess
like pam_exec.
See this thread on StackExchange, which also claim the CentOS package have
fixed the bug.
https://askubuntu.com/questions/406486/vsftpd-hanging-when-using-
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