Possible threading issues with Rack::Mount

Possible threading issues with Rack::Mount

[Johan Buts]

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Hi all,

I would like to refer to intridea/grape#281<https://github.com/intridea/grape/issues/281> for 
the issue we were experiencing a couple of days ago with running grape 
(with has rack-mount as a dependency) and puma as a webserver. After a 
restart we were able to fix it but it seems to us that Rack::Mount could 
have some threading issues. I am not an expert at this and i can only try 
to pinpoint where the potential issue is located.

It seems that regin.rb is autoloading the Parser class ('regin/parser') and 
at the end of the parser.rb it requires 'regin/tokenizer' which then 
defines the scan_str method which the stacktrace is complaining about. I 
think in line 545 it could go wrong if tokenizer is not loaded yet.

Any feedback?

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