File cache inactive queue full

[Maxim Dounin]

Hello!

On Fri, Sep 01, 2017 at 03:55:57PM -0300, Vinicius Mignot wrote:

> I’m facing some problems when file cache is being cleaned by 
> hitting watermark. Some files are not deleted after getting in 
> expiring criteria, they just keep being moved to the head of the 
> inactive queue. After some time, all top positions are filled 
> and no files are removed anymore. 

This can happen in two basic cases:

1. There is a socket leak somewhere, and leaked connections keep 
reference counts of relevant cache nodes incremented.  As of now, 
there are some reports of socket leak problem somewhere in HTTP/2 
code, see https://trac.nginx.org/nginx/ticket/1163.

2. There are worker crashes.

Both cases should be clearly visible in logs.  Leaks are reported 
during worker shutdown, and crashes are reported as they happen.

-- 
Maxim Dounin
http://nginx.org/