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Issue #15887 has been updated by alanwu (Alan Wu).
Here's is a one line crasher: `ruby -e '$0 = "hi"; 4.times { GC.start }; Process.argv0.class'`
This crashes 2.5.5 and 2.6.3, but 2.4.6 seems to be immune. Bisect points to 478003f6df40dc79d33c6ec86919f2dde07284be.
I have a PR for this: https://github.com/ruby/ruby/pull/2213
----------------------------------------
Bug #15887: Process.argv0 can return bad values in Ruby 2.5
https://bugs.ruby-lang.org/issues/15887#change-78274
* Author: joeym (Joey Marianer)
* Status: Open
* Priority: Normal
* Assignee:
* Target version:
* ruby -v: ruby 2.5.5p157 (2019-03-15 revision 67260) [x86_64-darwin18]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
MacOS 10.14.5 on a clean (source, using ruby-install) installation of Ruby 2.5.5
```
$ ruby --version
ruby 2.5.5p157 (2019-03-15 revision 67260) [x86_64-darwin18]
$ gem install vault vcr virtus webmock webrick
$ echo Process.argv0 | irb
```
...sometimes returns `{}`, sometimes some other nonsense and sometimes segfaults, but never (or rarely enough that I haven't seen it) returns a string ending in `bin/irb` as expected.
Unfortunately the bug only manifests when certain gems are installed; the set I included above is one possible set of gems that triggers the bug; I don't know what's special about it.
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