Bug #17780: Backport for super_method aliases in ruby 2.7.3 causes Segfault

• Status: Closed
• Assignee: peterzhu2118 (Peter Zhu)
• Target version: -
• ruby -v: 2.7.3p183
• Backport: 2.6: DONE, 2.7: DONE, 3.0: DONE

[dewyze (John DeWyze)]

This error was discovered while trying to run bundle exec srb init on a new rails project.

Thanks to Peter Zhu for debugging this, finding the breaking commit, and providing a minimum example:

Breaking commit: https://github.com/ruby/ruby/commit/c98aa2db60f43e839d7a82897c22b5ceecbed417

Minimum example:

module Test
  def foo
    puts "hello"
  end
  alias :f :foo
end
method = Test.instance_method(:f)
super_method = method.super_method

[peterzhu2118 (Peter Zhu)]

• Assignee set to peterzhu2118 (Peter Zhu)

[peterzhu2118 (Peter Zhu)]

Note that this bug is reproducible on 2.6.7, 2.7.3, 3.0.1, master.

[peterzhu2118 (Peter Zhu)]

• File crash.log crash.log added

Crash log is attached below.

[peterzhu2118 (Peter Zhu)]

GitHub PR: https://github.com/ruby/ruby/pull/4364

[jeremyevans0 (Jeremy Evans)]

Pull request submitted to fix this: https://github.com/ruby/ruby/pull/4365

[jeremyevans0 (Jeremy Evans)]

• Backport changed from 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN to 2.6: REQUIRED, 2.7: REQUIRED, 3.0: REQUIRED

• Status changed from Open to Closed

Applied in changeset git|d8a13e504992a45d52063f7c925408d7aad3595a.

---

[Bug #17780] Fix Method#super_method for module alias

Method#super_method crashes for aliased module methods because they are
not defined on a class. This bug was introduced in
c60aaed1856b2b6f90de0992c34771830019e021 as part of bug #17130.

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 2.6: REQUIRED, 2.7: REQUIRED, 3.0: REQUIRED to 2.6: REQUIRED, 2.7: REQUIRED, 3.0: DONE

ruby_3_0 410216c9db033a72f4dd119c366bc58dd54383ec merged revision(s) d8a13e504992a45d52063f7c925408d7aad3595a.

[usa (Usaku NAKAMURA)]

• Backport changed from 2.6: REQUIRED, 2.7: REQUIRED, 3.0: DONE to 2.6: REQUIRED, 2.7: DONE, 3.0: DONE

[usa (Usaku NAKAMURA)]

• Backport changed from 2.6: REQUIRED, 2.7: DONE, 3.0: DONE to 2.6: DONE, 2.7: DONE, 3.0: DONE

ruby_2_6 r67945 merged revision(s) d8a13e50.