FastCGI cache file has too long header

[Maxim Dounin]

Hello!

On Thu, Dec 13, 2018 at 05:44:08PM +0200, Palvelin Postmaster via nginx wrote:

> 
> 
> > On 13 Dec 2018, at 16:31, Maxim Dounin <mdounin at mdounin.ru> wrote:
> > 
> > Hello!
> > 
> > On Thu, Dec 13, 2018 at 11:17:03AM +0200, Palvelin Postmaster via nginx wrote:
> > 
> >> Hi,
> >> 
> >> I run nginx/1.14.0 (Ubuntu 18.04) and PHP-FPM 7.2. I get such occasional (daily) errors about too long cache file headers:
> >> 
> >> 2018/12/13 10:39:49 [crit] 1537#1537: *760972 cache file "/var/lib/nginx/fastcgi/mydomain-fi/d/be/7a11ac32c28dc9f8c3d7da12fe3d6bed" has too long header, client: XXX.XXX.XXX.XXX, server: mydomain.fi, request: "GET /kotitreeni/ HTTP/1.1", host: ”mydomain.fi"
> >> 
> >> Can someone offer any insight as to why this is happening, what I could do to prevent it or how I could further analyze the cause?
> >> 
> >> Here are a couple examples of headers from such cache files _after_ the error log entry (possibly redundant, but anyhow):
> >> 
> >> 
> >> 

> >> Expires: Thu, 13 Dec 2018 09:39:31 GMT
> >> Pragma: public
> >> Cache-Control: max-age=3582, public
> >> ETag: "a652b989092efd137f04e13cad4af4b3"
> >> X-Powered-By: W3 Total Cache/0.9.7
> >> Content-Encoding: gzip
> >> Vary: Accept-Encoding
> >> 
> >> 
> >> 
> >> 

> >> Expires: Thu, 13 Dec 2018 08:02:19 GMT
> >> Pragma: public
> >> Cache-Control: max-age=1696, public
> >> ETag: "4fca3f56d337d2057ce73a6dd5712d80"
> >> X-Powered-By: W3 Total Cache/0.9.7
> >> Content-Encoding: gzip
> >> Vary: Accept-Encoding
> > 
> > "Vary" may indicate that you are hitting the bug with multiple 
> > variants.  Could you please try the patch from 
> > 
> > http://mailman.nginx.org/pipermail/nginx-devel/2018-January/010774.html
> > 
> > to see if it helps?
> 
> I’m afraid patching source and rebuilding is over my head. :(
> 
> Can I presume if it’s a known bug, it will eventually get fixed?

Well, eventually.  But, as you can see, the patch was made almost 
a year ago, and still not committed due to lack of testing from 
affected users.

-- 
Maxim Dounin
http://mdounin.ru/