Bug#314356: Same problem here

[Michel Meyers]

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I also see this happening here from time to time (same error messages
about the lock, exim process eating 99% CPU and requiring a kill -9).

If I am not mistaken it occurs when Exim cannot deliver a message
immediately (for example if I send something to a server using greylisting).

Usually just killing the offending process with -9 is enough to get
everything going again.

Greetings,
        Michel

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