From: David Flanagan <david@...>
Date: 2007-10-23T13:24:00+09:00
Subject: Re: Simple One liner crashes YARV	 trap ('INT', &oldTrap)  crashes Ruby 1.9.0 code generator

Brent,

I can't reproduce this on Linux:

$ruby1.9 -v -e 'trap("INT", &oldTrap)' ruby 1.9.0 (2007-10-18 patchlevel 
0) [i686-linux]
-e:1:in `method_missing': undefined local variable or method `oldTrap' 
for main:Object (NameError)
         from -e:1:in `<main>'

$ ruby1.9 -v -e 'oldTrap=lambda{}; trap("INT", &oldTrap)' ruby 1.9.0 
(2007-10-18 patchlevel 0) [i686-linux]

	David

Brent Roman wrote:
> The one line Ruby text:
> 
> trap ('INT', &oldTrap)
> 
> crashes my snapshot of Ruby 1.9.0
> 
> with the following backtrace:
> 
> 
> /home/brent/ESP/gen2/software/ruby/ruby19-mbari/vm_dump.c:588
> /home/brent/ESP/gen2/software/ruby/ruby19-mbari/error.c:212
> /home/brent/ESP/gen2/software/ruby/ruby19-mbari/error.c:228
> /home/brent/ESP/gen2/software/ruby/ruby19-mbari/compile.c:2545
> /home/brent/ESP/gen2/software/ruby/ruby19-mbari/compile.c:3586
> /home/brent/ESP/gen2/software/ruby/ruby19-mbari/compile.c:181
> /home/brent/ESP/gen2/software/ruby/ruby19-mbari/iseq.c:297
> /home/brent/ESP/gen2/software/ruby/ruby19-mbari/iseq.c:308
> /home/brent/ESP/gen2/software/ruby/ruby19-mbari/iseq.c:282
> /home/brent/ESP/gen2/software/ruby/ruby19-mbari/eval.c:232
> /home/brent/ESP/gen2/software/ruby/ruby19-mbari/eval.c:262
> /home/brent/ESP/gen2/software/ruby/ruby19-mbari/main.c:32
> 
> -------------------------------------------------------
> [BUG] setup_arg: unknown node: NODE_STR
> 
> ruby 1.9.0-mbari (2007-10-18) [i686-linux]
> 
> 
> Note that my snapshot is about 2 weeks old.  However, I have been
> watching the core list and have not heard about this problem. 
> This crash should be very easy to reproduce.
> Would anyone with an unpatched, fresh snapshot
> of 1.9.0 care to confirm that it is broken.
> 
> My guess is that YARV is choking on the the &proc expression
> in the context of the trap kernel method as this can also be a String.
> Note that it does not even complain about the missing
> local variable/method "oldTrap".   If you define a Proc called oldTrap
> first, the trap('INT', &oldTrap)  will bomb in exactly the same way.
> However,
> 
> trap('INT', "junk")
> 
> fails gracefully with ArgumentError:  wrong trap - junk
> 
> I have already managed to port a few thousand lines of our app
> over to Ruby 1.9 without much incident.  I really had been quite
> impressed with its stability.   I'm hoping that this has an easy fix.
> 
> - brent
> 
>