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Re: md5 collision

Maxim Dounin
September 14, 2012 07:16AM
Hello!

On Thu, Sep 13, 2012 at 07:43:16PM -0400, karlseguin wrote:

> Yes, re-requesting the same image will cause the same error (can't say with
> 100% certainty that it'll always do it though).
>
>
> sudo hd /mnt/tmp/nginx/cache/5f/85/1b/56cc2e05fb85eb0a806444f1811b855f
> 00000000 ff d8 ff e0 00 10 4a 46 49 46 00 01 01 00 00 01
> |......JFIF......|
>
> Naively, there doesn't seem to be any special header bytes?

This looks like a completely corrupted cache file, without any
headers at all.

> Relevant config is:
>
> upstream origin_magick {
> server 127.0.0.1:4000;
> keepalive 50;
> }
>
> proxy_cache_path /mnt/tmp/nginx/cache levels=2:2:2 keys_zone=main:200m
> max_size=100G;
> proxy_cache_use_stale updating;
> proxy_http_version 1.1;
> proxy_cache_valid any 1m;
> more_clear_headers 'X-amz-*' 'x-amz-*' 'X-Content-Digest' 'X-Rack-Cache;
>
> location / {
> proxy_cache_bypass $http_nocache;
> proxy_cache main;
> proxy_pass http://origin_magick;
> more_set_headers -s '404 403' 'Cache-Control: public, max-age=120';
> }

Please try removing the cache file in question (move it away or
just delete) and re-request it twice (once to cache the response,
and once to see the error) to see if problem persists. Please
also make sure you are able to reproduce the problem without any
3rd party modules/patches (and preferably with latest nginx
1.3.6).

If the problem persists, please follow
http://wiki.nginx.org/Debugging and provide minimal full config
you are able to reproduce the probem with, and full debug log
(since file removal).

Maxim Dounin

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Subject Author Posted

md5 collision

karlseguin September 13, 2012 07:07AM

Re: md5 collision

Maxim Dounin September 13, 2012 08:50AM

Re: md5 collision

karlseguin September 13, 2012 11:21AM

Re: md5 collision

Maxim Dounin September 13, 2012 04:16PM

Re: md5 collision

karlseguin September 13, 2012 07:43PM

Re: md5 collision

Maxim Dounin September 14, 2012 07:16AM



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