Issue #10852 has been reported by Usaku NAKAMURA.

----------------------------------------
Bug #10852: TestObjSpace#test_dump_flags sometimes fails on mswin-CI
https://bugs.ruby-lang.org/issues/10852

* Author: Usaku NAKAMURA
* Status: Assigned
* Priority: Normal
* Assignee: Koichi Sasada
* ruby -v: trunk
* Backport: 2.0.0: DONTNEED, 2.1: DONTNEED, 2.2: REQUIRED
----------------------------------------
mswinのCIで、以下のfailureが時々(2割くらい?)出るのですが、何がまずいのでしょうか?
2.2だと頻度はぐっと下がりますが、出ないわけではないようです。

'''
  1) Failure:
TestObjSpace#test_dump_flags [D:/tmp/mswin-build20150213-6324-8fqgzk/ruby/test/objspace/test_objspace.rb:199]:
Expected /"wb_protected":true, "old":true, "long_lived":true, "marked":true/ to match "{\"address\":\"0x00000001f5cfe8\", \"type\":\"STRING\", \"class\":\"0x00000000db8ee0\", \"frozen\":true, \"embedded\":true, \"fstring\":true, \"bytesize\":3, \"value\":\"foo\", \"encoding\":\"UTF-8\", \"memsize\":40, \"flags\":{\"wb_protected\":true, \"old\":true}}\n".
'''



-- 
https://bugs.ruby-lang.org/