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Race condition in ActionController::Caching::Pages
Reported by Stephen Judkins | May 11th, 2011 @ 02:05 AM
Using JRuby 1.6.0, we saw a corrupt file created by Rails' page caching. It appeared that multiple threads were able to write simultaneously to a cache file.
We were able to duplicate the behavior we saw with the following contrived example:
f1 = File.open("out", "wb+")
f2 = File.open("out", "wb+")
10000.times do
f1.write "a"
f2.write "b"
end
f2.close
f1.close
This results with a file with interleaved "a" and "b" characters.
I'm not sure if this behavior occurs across processes as well, but it's likely to be much more prevalent in a multi-threaded program.
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Stephen Judkins