detail file locking

[Thor Spruyt]

Hi,

Using freeradius 3.0.25 on centos 7

I have a configuration with a "detail" module writing to a file with locking = yes
I have a type = detail listener on that same file. 

Under some load, apparantly, very sporadically a packet seems to gets lost.
Am I correct to say that with locking = yes , there should never be any packet lost due to the reader renaming the file while the writer is writing to it ?

How would be a good approach to further troubleshoot this ?

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Regards,
Thor