[ruby-core:104755] [Ruby master Bug#18058] 3.1.0-dev with MJIT enabled Zlib::BufError during `gem install`

Issue #18058 has been updated by k0kubun (Takashi Kokubun).


Do you know if we can let Bundler show the backtrace? The first step to fix this is to increase reproduction probability, and the backtrace information might be helpful for reproducing the issue with a smaller script for it.

----------------------------------------
Bug #18058: 3.1.0-dev with MJIT enabled Zlib::BufError during `gem install`
https://bugs.ruby-lang.org/issues/18058#change-93091

* Author: byroot (Jean Boussier)
* Status: Open
* Priority: Normal
* Assignee: k0kubun (Takashi Kokubun)
* ruby -v: ruby 3.1.0dev (2021-08-01T00:54:36Z master 605421f4eb) +JIT [x86_64-linux]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
It doesn't always happen (maybe 5-10% of the cases), but since I added MJIT to our CI builds I've been seeing this error a lot. 

I was able to reproduce it in `docker run -it rubylang/ruby:master-nightly-bionic` after 15 or so tries:

```
# ruby -v
ruby 3.1.0dev (2021-08-01T00:54:36Z master 605421f4eb) [x86_64-linux]
# gem uninstall bundler -v 2.2.21; env RUBYOPT="--enable-jit --jit-max-cache=10000 --jit-min-calls=10 $RUBYOPT" gem install --no-document --user-install bundler -v 2.2.21
Successfully uninstalled bundler-2.2.21
WARNING:  You don't have /root/.local/share/gem/ruby/3.1.0/bin in your PATH,
	  gem executables will not run.
Exception while verifying /usr/local/lib/ruby/gems/3.1.0/cache/bundler-2.2.21.gem
ERROR:  While executing gem ... (Zlib::BufError)
    buffer error
```


e.g.

```
$ docker run -it rubylang/ruby:master-nightly-bionic bash -c 'while env RUBYOPT="--enable-jit --jit-max-cache=10000 --jit-min-calls=10 $RUBYOPT" gem install --no-document --user-install bundler -v 2.2.21; do gem uninstall bundler -v 2.2.21; done'
Fetching bundler-2.2.21.gem
WARNING:  You don't have /root/.local/share/gem/ruby/3.1.0/bin in your PATH,
	  gem executables will not run.
Successfully installed bundler-2.2.21
1 gem installed
Successfully uninstalled bundler-2.2.21
WARNING:  You don't have /root/.local/share/gem/ruby/3.1.0/bin in your PATH,
	  gem executables will not run.
Successfully installed bundler-2.2.21
1 gem installed
Successfully uninstalled bundler-2.2.21
WARNING:  You don't have /root/.local/share/gem/ruby/3.1.0/bin in your PATH,
	  gem executables will not run.
Successfully installed bundler-2.2.21
1 gem installed
Successfully uninstalled bundler-2.2.21
WARNING:  You don't have /root/.local/share/gem/ruby/3.1.0/bin in your PATH,
	  gem executables will not run.
Successfully installed bundler-2.2.21
1 gem installed
Successfully uninstalled bundler-2.2.21
WARNING:  You don't have /root/.local/share/gem/ruby/3.1.0/bin in your PATH,
	  gem executables will not run.
Successfully installed bundler-2.2.21
1 gem installed
Successfully uninstalled bundler-2.2.21
WARNING:  You don't have /root/.local/share/gem/ruby/3.1.0/bin in your PATH,
	  gem executables will not run.
Successfully installed bundler-2.2.21
1 gem installed
Successfully uninstalled bundler-2.2.21
WARNING:  You don't have /root/.local/share/gem/ruby/3.1.0/bin in your PATH,
	  gem executables will not run.
Successfully installed bundler-2.2.21
1 gem installed
Successfully uninstalled bundler-2.2.21
WARNING:  You don't have /root/.local/share/gem/ruby/3.1.0/bin in your PATH,
	  gem executables will not run.
Successfully installed bundler-2.2.21
1 gem installed
Successfully uninstalled bundler-2.2.21
WARNING:  You don't have /root/.local/share/gem/ruby/3.1.0/bin in your PATH,
	  gem executables will not run.
Successfully installed bundler-2.2.21
1 gem installed
Successfully uninstalled bundler-2.2.21
WARNING:  You don't have /root/.local/share/gem/ruby/3.1.0/bin in your PATH,
	  gem executables will not run.
Exception while verifying /usr/local/lib/ruby/gems/3.1.0/cache/bundler-2.2.21.gem
ERROR:  While executing gem ... (Zlib::BufError)
    buffer error
```



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