Forum: Ruby-core [Ruby 1.8.7-RubySpec#3757][Open] GC bug after loading gem

RubySpec #3757: GC bug after loading gem
http://redmine.ruby-lang.org/issues/show/3757

Author: Joel VanderWerf
Status: Open, Priority: Normal

This bug is very general. All you have to do is:

1) require enough of the stdlib
2) require some gem
3) GC.stress=true
4) create a few objects

See the attached gcbug.rb.

The bug appears on both x86_64-linux and i686-linux.

It does not happen with ruby-1.9.2, AFAICT.

It does happen with both p302 and p299 of ruby-1.8.7.

The bug is typically reported as one of the following:

gcbug.rb:24: [BUG] Segmentation fault
ruby 1.8.7 (2010-08-16 patchlevel 302) [x86_64-linux]

gcbug.rb:24: [BUG] rb_gc_mark(): unknown data type 0x18(0x1bbaf00) non 
object
ruby 1.8.7 (2010-08-16 patchlevel 302) [x86_64-linux]

Issue #3757 has been updated by Roger Pack.


does this occur with 1.9.3dev?
-r
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http://redmine.ruby-lang.org/issues/show/3757

On 08/30/2010 10:31 AM, Roger Pack wrote:
> Issue #3757 has been updated by Roger Pack.
>
>
> does this occur with 1.9.3dev?

Is there any reason to suspect it would occur in 1.9.3dev? It doesn't
occur in 1.9.2.

Issue #3757 has been updated by Roger Pack.


> Is there any reason to believe it will occur with 1.9.3dev?

It might. I ran into an odd gc bug once with 1.9.3dev and not 1.9.2 (I 
think it's gone, but just checking out of curiosity..).

Thanks.
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http://redmine.ruby-lang.org/issues/show/3757

On 08/31/2010 10:51 AM, Roger Pack wrote:
>> Is there any reason to believe it will occur with 1.9.3dev?
>
> It might. I ran into an odd gc bug once with 1.9.3dev and not 1.9.2 (I think it's gone, but just checking out of curiosity..).

Good point.

I checked 1.9.3 out of svn today. I cannot recreate the bug.

Anyone else see this bug on 1.8.7, or is it just me?