[1.9] Random instance marshal data incompatible with CRuby 1.9
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Key: JRUBY-5335
URL: http://jira.codehaus.org/browse/JRUBY-5335
Project: JRuby
Issue Type: Task
Components: Core Classes/Modules
Affects Versions: JRuby 1.6RC1
Environment: jruby 1.6.0.RC1 (ruby 1.8.7 patchlevel 330) (2011-01-12
71f8afd) (OpenJDK 64-Bit Server VM 1.6.0_20) [linux-amd64-java]
Reporter: Hiroshi Nakamura
CRuby's Random (uses Mersenne Twister) serializes it's state, left bytes and
seed for restoring PRNG's state. We don't support PRNG state dump/load at
present.
So Random's marshal format is incompatible. It would affect to dRuby, etc if
one want to Marshal PRNG, I think it's a rare case though.
{noformat}
0% jruby --1.9 -e 'print Marshal.dump(Random.new)' | ruby -e 'p
Marshal.load(STDIN)'
-e:1:in `marshal_load': wrong argument type Random (expected Bignum) (TypeError)
from -e:1:in `load'
from -e:1:in `<main>'
0% jruby -v
jruby 1.6.0.RC1 (ruby 1.8.7 patchlevel 330) (2011-01-12 71f8afd) (OpenJDK
64-Bit Server VM 1.6.0_20) [linux-amd64-java]
0% ruby -v
ruby 1.9.3dev (2011-01-11 trunk 30513) [x86_64-linux]
{noformat}
By definition, we cannot let it be compatible without implementing exactly the
same Mersenne Twister logic as CRuby. Take care, it could cause security issues.
Shall we do this?
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