Your reasoning is excellent -- it's only your basic assumptions that are wrong. ...
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ID Status Resolution Sev Product Comp Assignee Reporter Summary
25841 NEW --- nor Sisyphus vsftpd placeholder lav Зависает vsftpd при подключении pam_script в /etc/pam.d/system-auth

File a new bug in the "vsftpd" component of the "Sisyphus" product