Q0073 - Exim/exim GitHub Wiki
I'm seeing log file corruption, with parts of log lines getting mangled by other log entries.
The only times this has been seen is when several servers were writing to the same log files over NFS or from multiple containers. Exim assumes that its log file is on local disk. Using NFS, especially for more than one server, will not work.
We have also seen reports of lock file issues with a shared spool directory.