Multiple attempts to delete the same (inexistant) file

[AlbinoDrought]

1 errors have occured on the following session:
IP: [::1] UA: [ApacheBench/2.3] URL: [http://localhost/]
Errors:
Severity: Warning --> unlink(/www/application/cache/news_model/3e66759ca8f636b2ee7abea7f3e3e8854fd941ca.cache): Permission denied /www/application/libraries/Cache.php 372

1 errors have occured on the following session:
IP: [::1] UA: [ApacheBench/2.3] URL: [http://localhost/]
Errors:
Severity: Warning --> unlink(/www/application/cache/news_model/3e66759ca8f636b2ee7abea7f3e3e8854fd941ca.cache): Permission denied /www/application/libraries/Cache.php 372

1 errors have occured on the following session:
IP: [::1] UA: [ApacheBench/2.3] URL: [http://localhost/]
Errors:
Severity: Warning --> unlink(/www/application/cache/news_model/3e66759ca8f636b2ee7abea7f3e3e8854fd941ca.cache): Permission denied /www/application/libraries/Cache.php 372

1 errors have occured on the following session:
IP: [::1] UA: [ApacheBench/2.3] URL: [http://localhost/]
Errors:
Severity: Warning --> unlink(/www/application/cache/news_model/3e66759ca8f636b2ee7abea7f3e3e8854fd941ca.cache): No such file or directory /www/application/libraries/Cache.php 372

1 errors have occured on the following session:
IP: [::1] UA: [ApacheBench/2.3] URL: [http://localhost/]
Errors:
Severity: Warning --> unlink(/www/application/cache/news_model/3e66759ca8f636b2ee7abea7f3e3e8854fd941ca.cache): No such file or directory /www/application/libraries/Cache.php 372

This occurred while ApacheBench was running a benchmark (100 cycles). I think it detected the cache was old and attempted to delete it multiple times (race condition?). Possibly fixable with flock?