Irb: Segmentation fault

ruby-talk
1

Hello folks,

in the following two cases irb fails (I've removed spaces from the =~/^irb/ lines to prevent line breaks):

$ irb
irb(main):001:0>"ahoj".split(//).join('|')
=> "a|h|o|j"
irb(main):002:0>"ahoj".split(/(?<=(?![Cc][Hh]).)/).join('|')
SyntaxError: compile error
(irb):2: undefined (?...) sequence: /(?<=(?![Cc][Hh]).)/
         from (irb):2
irb(main):003:0>"ahoj".split(/(?!ch)/).join('|')
=> "a|h|o|j"
irb(main):004:0>"achoj".split(/(?!ch)/).join('|')
=> "ac|h|o|j"
irb(main):005:0>"achoj".gsub(/([Cc])([Hh])/,'$1_$2').split(/(?!_[Hh])/).join('|')
=> "a|$|1|_|$|2|o|j"
irb(main):006:0>"achoj".gsub(/([Cc])([Hh])/,'\1_\2').split(/(?!_[Hh])/).join('|')
/usr/lib/ruby/1.8/irb/ruby-lex.rb:979: [BUG] Segmentation fault
ruby 1.8.2 (2005-04-11) [i386-linux]

Neúspěšně ukončen (SIGABRT)
$

$ irb
irb(main):001:0>"ahoj".split(//).join('|')
=> "a|h|o|j"
irb(main):002:0>"ahoj".split(/(?<=(?![Cc][Hh]).)/).join('|')
SyntaxError: compile error
(irb):2: undefined (?...) sequence: /(?<=(?![Cc][Hh]).)/
         from (irb):2
irb(main):003:0>"ahoj".split(/(?!ch)/).join('|')
=> "a|h|o|j"
irb(main):004:0>"achoj".gsub(/([Cc])([Hh])/,'$1_$2').split(/(?!_[Hh])/).join('|')
=> "a|$|1|_|$|2|o|j"
irb(main):005:0>"achoj".gsub(/([Cc])([Hh])/,'\1_\2').split(/(?!_[Hh])/).join('|')
=> "a|c_|h|o|j"
/usr/lib/ruby/1.8/irb.rb:265: [BUG] Segmentation fault
ruby 1.8.2 (2005-04-11) [i386-linux]

Neúspěšně ukončen (SIGABRT)
$

["Neúspěšně ukončen" is perhaps some Czech translation of SIGABRT]

If I repeat it exactly as shown, irb fails. I've tried to skip some statements, but only the fourth could be skipped to get Segmentation fault --- and even in this case the error message differed (and return value was got compared to the first case). Skipping whichever else does not lead to failure. I haven't tried simplifying of the statements too much (only a bit, but unsuccessfully with respect to retain the irb failure).

Please, could someone test it with current version of ruby/irb?

Where should one post such bugreports?

Regards,

P.

2

Pavel Smerk wrote:

    Hello folks,

in the following two cases irb fails (I've removed spaces from the =~/^irb/ lines to prevent line breaks):

$ irb
irb(main):001:0>"ahoj".split(//).join('|')
=> "a|h|o|j"
irb(main):002:0>"ahoj".split(/(?<=(?![Cc][Hh]).)/).join('|')
SyntaxError: compile error
(irb):2: undefined (?...) sequence: /(?<=(?![Cc][Hh]).)/
        from (irb):2
irb(main):003:0>"ahoj".split(/(?!ch)/).join('|')
=> "a|h|o|j"
irb(main):004:0>"achoj".split(/(?!ch)/).join('|')
=> "ac|h|o|j"
irb(main):005:0>"achoj".gsub(/([Cc])([Hh])/,'$1_$2').split(/(?!_[Hh])/).join('|')

=> "a|$|1|_|$|2|o|j"
irb(main):006:0>"achoj".gsub(/([Cc])([Hh])/,'\1_\2').split(/(?!_[Hh])/).join('|')

/usr/lib/ruby/1.8/irb/ruby-lex.rb:979: [BUG] Segmentation fault
ruby 1.8.2 (2005-04-11) [i386-linux]

Neúspěšně ukončen (SIGABRT)
$

Works for me:

$ irb -v
irb 0.9(02/07/03)
$ ruby -v
ruby 1.8.2 (2004-12-25) [i586-linux-gnu]
$ irb
irb(main):001:0> "ahoj".split(//).join('|')
=> "a|h|o|j"
irb(main):002:0> "ahoj".split(/(?<=(?![Cc][Hh]).)/).join('|')
SyntaxError: compile error
(irb):2: undefined (?...) sequence: /(?<=(?![Cc][Hh]).)/
        from (irb):2
irb(main):003:0> "ahoj".split(/(?!ch)/).join('|')
=> "a|h|o|j"
irb(main):004:0> "achoj".split(/(?!ch)/).join('|')
=> "ac|h|o|j"
irb(main):005:0> "achoj".gsub(/([Cc])([Hh])/,'$1_$2').split(/(?!_[Hh])/).join('|')
=> "a|$|1|_|$|2|o|j"
irb(main):006:0> "achoj".gsub(/([Cc])([Hh])/,'\1_\2').split(/(?!_[Hh])/).join('|')
=> "a|c_|h|o|j"
irb(main):007:0> quit

$ irb
irb(main):001:0>"ahoj".split(//).join('|')
=> "a|h|o|j"
irb(main):002:0>"ahoj".split(/(?<=(?![Cc][Hh]).)/).join('|')
SyntaxError: compile error
(irb):2: undefined (?...) sequence: /(?<=(?![Cc][Hh]).)/
        from (irb):2
irb(main):003:0>"ahoj".split(/(?!ch)/).join('|')
=> "a|h|o|j"
irb(main):004:0>"achoj".gsub(/([Cc])([Hh])/,'$1_$2').split(/(?!_[Hh])/).join('|')

=> "a|$|1|_|$|2|o|j"
irb(main):005:0>"achoj".gsub(/([Cc])([Hh])/,'\1_\2').split(/(?!_[Hh])/).join('|')

=> "a|c_|h|o|j"
/usr/lib/ruby/1.8/irb.rb:265: [BUG] Segmentation fault
ruby 1.8.2 (2005-04-11) [i386-linux]

Neúspěšně ukončen (SIGABRT)
$

Works for me:
$ irb
irb(main):001:0> "ahoj".split(//).join('|')
=> "a|h|o|j"
irb(main):002:0> "ahoj".split(/(?<=(?![Cc][Hh]).)/).join('|')
SyntaxError: compile error
(irb):2: undefined (?...) sequence: /(?<=(?![Cc][Hh]).)/
        from (irb):2
irb(main):003:0> "ahoj".split(/(?!ch)/).join('|')
=> "a|h|o|j"
irb(main):004:0> "achoj".gsub(/([Cc])([Hh])/,'$1_$2').split(/(?!_[Hh])/).join('|')
=> "a|$|1|_|$|2|o|j"
irb(main):005:0> "achoj".gsub(/([Cc])([Hh])/,'\1_\2').split(/(?!_[Hh])/).join('|')
=> "a|c_|h|o|j"
irb(main):006:0>

["Neúspěšně ukončen" is perhaps some Czech translation of SIGABRT]

If I repeat it exactly as shown, irb fails. I've tried to skip some statements, but only the fourth could be skipped to get Segmentation fault --- and even in this case the error message differed (and return value was got compared to the first case). Skipping whichever else does not lead to failure. I haven't tried simplifying of the statements too much (only a bit, but unsuccessfully with respect to retain the irb failure).

Please, could someone test it with current version of ruby/irb?

Where should one post such bugreports?

Regards,

P.

Maybe you just need a slightly newer version?

-Justin