is this normal behaviour? Failed to make directory File exists

[Eric D]

Is this normal behaviour?

[Mon May 02 14:30:01.608070 2016] [error] [pid 21813] [mod_pagespeed 1.11.33.1-0 @21813] Failed to make directory /var/cache/mod_pagespeed/v3/xxxxxxx.com/http,3A/,2Fwww.xxxxxxx.com/js/prettysociable/images: File exists

Our audit system alerts us of error, is it safe to whitelist this or do i have a broken config???  Shouldn't it be smart enough to overwrite the file?

[Steve Hill]

It's possible that one process creates the directory between another noticing it's missing and actually creating it. If that's true, you should only see these messages when you start up with a clean cache. Are you seeing a lot of them?

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