[ruby-core:106698] [Ruby master Bug#18409] Crash (free(): invalid pointer) if LD_PRELOAD doesn't explicitly include libjemalloc.so.2

Issue #18409 has been updated by xtkoba (Tee KOBAYASHI).


I noticed that commit:737e4432b978eb4b9f5b10fb6cc6d9c883a5d17a is not backported to Ruby 3.0.x series. So before `./configure` you may need to do something like

```bash
export LDFLAGS="-Wl,--no-as-needed"
```

Make sure that the `ruby` executable has `DT_NEEDED` entry for `libjemalloc.so`:

```
$ readelf -Wa ruby | grep NEEDED
 0x0000000000000001 (NEEDED)             Shared library: [libruby.so.3.1]
 0x0000000000000001 (NEEDED)             Shared library: [libz.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libpthread.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [librt.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libjemalloc.so.2]
 0x0000000000000001 (NEEDED)             Shared library: [libgmp.so.10]
 0x0000000000000001 (NEEDED)             Shared library: [libdl.so.2]
 0x0000000000000001 (NEEDED)             Shared library: [libcrypt.so.2]
 0x0000000000000001 (NEEDED)             Shared library: [libm.so.6]
 0x0000000000000001 (NEEDED)             Shared library: [libbacktrace.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so.6]
```

----------------------------------------
Bug #18409: Crash (free(): invalid pointer) if LD_PRELOAD doesn't explicitly include libjemalloc.so.2
https://bugs.ruby-lang.org/issues/18409#change-95380

* Author: itay-grudev (Itay Grudev)
* Status: Open
* 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: UNKNOWN
----------------------------------------
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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