Bug #17360: Objects disappear from ObjectSpace after using Ractor

• Status: Rejected
• Assignee: -
• Target version: -
• Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN

[Dan0042 (Daniel DeLorme)]

Test:

GC.disable
STR = -"testing 123"
x = STR.dup
puts "before:"
ObjectSpace.each_object(String){ |s| puts s.object_id if s == STR }
Ractor.new{ }.take
puts "after:"
ObjectSpace.each_object(String){ |s| puts s.object_id if s == STR }

Result:

before:
60
80
100
<internal:ractor>:38: warning: Ractor is experimental, and the behavior may change in future versions of Ruby! Also there are many implementation issues.
after:
80

Expected result:
Same object ids should be printed before and after

(BTW why 3 strings with the same value? shouldn't it be 2?)

[shyouhei (Shyouhei Urabe)]

• Status changed from Open to Rejected

Yes this is an intentional behaviour as of 3.0. Currently Ractor and ObjectSpace do not interface well. You cannot mix them now.

[wanabe (_ wanabe)]

• Has duplicate Bug #21149: Strange behavior of ObjectSpace.each_object after Ractor.new added