[ruby-core:94814] [Ruby master Bug#16136] String corruption in 2.6.4

Issue #16136 has been updated by mame (Yusuke Endoh).


@vcsjones Good to hear!  Thank you for confirming.  And your investigation by bisect was very helpful.
@deivid The most difficult part for me was to read .circleci/config.yml to reproduce the issue on my machine :-)

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Bug #16136: String corruption in 2.6.4
https://bugs.ruby-lang.org/issues/16136#change-81435

* Author: deivid (David Rodr刕uez)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.4p104 (2019-08-28 revision 67798) [x86_64-linux]
* Backport: 2.5: DONTNEED, 2.6: REQUIRED
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When trying to upgrade activeadmin's tests to use ruby 2.6.4, I got some very weird failures where some strings would end up containing random content. See https://circleci.com/gh/activeadmin/activeadmin/20329 for an example of those failures. Failures are somewhat random but the test suite seems to consistently fail on 2.6.4 and pass on 2.6.3. I also managed to reproduce the failures locally, sometimes very consistently, but now it's hardly ever happening... :/

I looked at the changes in 2.6.4 and it looks like https://bugs.ruby-lang.org/issues/16105 and/or https://bugs.ruby-lang.org/issues/15946 could be related, because the region of the Rails code where the corrupted string is created seems to be doing something similar to the reported issues: https://github.com/rails/rails/blob/b7e591a55f4de5f1511c3b9255b3b25159b8ba41/actionpack/lib/action_dispatch/routing/mapper.rb#L404-L412.

Sorry I'm not really sure how to create a reproducible example, or how to debug this issue. Just opening this in case it could help noticing something obviously wrong with the mentioned patches.



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