[ruby-core:107858] [Ruby master Bug#18409] Crash (free(): invalid pointer) if LD_PRELOAD doesn't explicitly include libjemalloc.so.2

Issue #18409 has been updated by nagachika (Tomoyuki Chikanaga).

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

ruby_3_0 09b27ec6a984ec1b660d5b7b48f2ff4d5a0065bc merged revision(s) 737e4432b978eb4b9f5b10fb6cc6d9c883a5d17a.

----------------------------------------
Bug #18409: Crash (free(): invalid pointer) if LD_PRELOAD doesn't explicitly include libjemalloc.so.2
https://bugs.ruby-lang.org/issues/18409#change-96797

* Author: itay-grudev (Itay Grudev)
* Status: Closed
* Priority: Normal
* ruby -v: ruby 3.0.3p157 (2021-11-24 revision 3fb7d2cadc) [x86_64-linux]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: DONE
----------------------------------------
I recently installed Ruby 3.0.2 using rbenv with:

```
RUBY_CONFIGURE_OPTS='--with-jemalloc' rbenv install 3.0.2
```

After running our app it always crashed with:

```
free(): invalid pointer
[1]    51364 IOT instruction (core dumped)  bundle exec rails assets:precompile
```

I also tried upgrading to `3.0.3` with no success.

After researching the bug a lot and lots of failed attempt to track it down I stumbled upon this report: https://github.com/grpc/grpc/issues/25450 that recommended trying:

```
LD_PRELOAD=$LD_PRELOAD:/lib/x86_64-linux-gnu/libjemalloc.so.2 bundle exec rails assets:precompile
```

That seems to have worked, but that can't be the proper solution in production. Surely it shouldn't be required.



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