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Bug #1329

closed

Ruby 1.8.8 で "p eval('0' + '+0.1'*n)" が Segmentation Fault を発生させる

Added by mrkn (Kenta Murata) almost 15 years ago. Updated over 4 years ago.

Status:
Closed
Target version:
-
ruby -v:
ruby 1.8.8dev (2009-03-19) [i386-darwin9.6.0]

Description

=begin
"p eval('0' + '+0.1'*n)" を評価すると、
n がある値 N1 を超えたときに TypeError が、
N2 を超えたときに Segmentation Fault が発生します。
N1 と N2 がアーキテクチャに依存するかどうかは調べてません。

$ ~/ruby-1.8.8-r23009/bin/ruby -ve "p eval('0'+'+0.1'*4581)"
ruby 1.8.8dev (2009-03-19) [i386-darwin9.6.0]
458.100000000036
$ ~/ruby-1.8.8-r23009/bin/ruby -ve "p eval('0'+'+0.1'*4582)"
ruby 1.8.8dev (2009-03-19) [i386-darwin9.6.0]
-e:1: can't modify frozen string (TypeError)
$ ~/ruby-1.8.8-r23009/bin/ruby -ve "p eval('0'+'+0.1'*5132)"
ruby 1.8.8dev (2009-03-19) [i386-darwin9.6.0]
-e:1: can't modify frozen string (TypeError)
$ ~/ruby-1.8.8-r23009/bin/ruby -ve "p eval('0'+'+0.1'*5133)"
ruby 1.8.8dev (2009-03-19) [i386-darwin9.6.0]
Segmentation fault

eval しなければ TypeError も SEGV も発生しないことは確認済です。

$ ~/ruby-1.8.8-r23009/bin/ruby -ve "'0'+'+0.1'*5133"
ruby 1.8.8dev (2009-03-19) [i386-darwin9.6.0]
-e:1: warning: useless use of + in void context
=end

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