Memory leak when creating new Store, Module and Instance

[evq]

Describe the bug

Memory leak

Steps to reproduce

Reproduces using the following variation of https://github.com/wasmerio/wasmer-python/blob/master/examples/appendices/simple.py

from wasmer import Store, Module, Instance
import os

__dir__ = os.path.dirname(os.path.realpath(__file__))

while True:
    module = Module(Store(), open(__dir__ + '/simple.wasm', 'rb').read())

    instance = Instance(module)
    result = instance.exports.sum(1, 2)

    print(result) # 3!

Expected behavior

The program should not leak memory.

Actual behavior

Memory is leaked eventually leading to:

Traceback (most recent call last):
  File "simple.py", line 9, in <module>
    instance = Instance(module)
RuntimeError: Insufficient resources: Failed to create memory: Error when allocating memory: Cannot allocate memory (os error 12)

[Hywan]

Thank you for the bug report.

What version are you using? Is it from the master branch?

[evq]

I'm using 1.0.0a3

[syrusakbary]

@Hywan I think the memory leak could be in the Wasmer Rust implementation itself (not in the Python integration).
We should investigate probably in the main repo :)

[MarkMcCaskey]

Related #1584 #1667 , I think all these are referring to the same bug