Issue #12296 has been reported by Nobuyoshi Nakada.

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Bug #12296: [Backport] fix dangling link
https://bugs.ruby-lang.org/issues/12296

* Author: Nobuyoshi Nakada
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: 
* Backport: 2.1: DONTNEED, 2.2: DONTNEED, 2.3: REQUIRED
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Backport r54628 to fix infinite loop by dangling link.
c.f. https://bugs.ruby-lang.org/issues/11816#change-58120



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