Am 23.12.24 um 11:57 schrieb Jeremy Harris via Exim-users:
Hmm. I have "qq.com" mentally flagged as a poor-quality communicant. It's not unlikely that it's going unresponsive, and this exim process is waiting on it. Presumably systemd is waiting on the entire process group, having successfully killed the group parent (the daemon). Can it be told to not do that?
The Debian 12 backports (4.98) exim4 systemd unit has no "ExecStop=" set. This means that "If no ExecStop= commands are specified, the service gets the SIGTERM immediately." I could now experiment with the two million (give or take) systemd options for timeouts, killsignals, watchdogs and so on but I'd rather not as this is a production system. I think I'll revert to the Debian Exim 4.96 and will investigate this on our staging system. The problem is that this only occurs on a system with high traffic which would indeed suggest, that there might be a hanging connection.
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