不久前，Linux Debian 12上发布了PAM.d服务的更新。这类服务的更新非常罕见，更新后，尝试登录时开始出现长时间的延迟：
ProFTPd
在我们的情况下，它通过xinetd服务运行，并不是一个独立的服务，这意味着授权是通过PAM.d完成的。
SSH
配置文件中的选项默认是启用的：
UsePAM yes
因此，两个服务都依赖于PAM.d的设置。
解决方案
长时间延迟的原因是配置文件中存在以下行：
session optional pam_systemd.so
在配置文件中
/etc/pam.d/common-session
去掉该行后，文件应如下所示：
#
# /etc/pam.d/common-session - session-related modules common to all services
#
# This file is included from other service-specific PAM config files,
# and should contain a list of modules that define tasks to be performed
# at the start and end of interactive sessions.
#
# As of pam 1.0.1-6, this file is managed by pam-auth-update by default.
# To take advantage of this, it is recommended that you configure any
# local modules either before or after the default block, and use
# pam-auth-update to manage selection of other modules. See
# pam-auth-update(8) for details.
# here are the per-package modules (the "Primary" block)
session [default=1] pam_permit.so
# here's the fallback if no module succeeds
session requisite pam_deny.so
# prime the stack with a positive return value if there isn't one already;
# this avoids us returning an error just because nothing sets a success code
# since the modules above will each just jump around
session required pam_permit.so
# and here are more per-package modules (the "Additional" block)
session required pam_unix.so
# end of pam-auth-update config
进行这些更改后，授权再次开始快速运行，没有延迟。
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