knewter / absinthe_memleak_reproduction

AbsintheMemleakReproduction

In Absinthe, parsing deeply nested inputs results in an enormous usage of memory.

Reproduction

mix test

This will run the tests. These tests simply try to run a mutation that doesn't exist, using an input type that doesn't exist, along with some deeply nested variables. On my machine, running this test yields over 4GB of memory usage.

This was extracted from a production system where we had to rework our mutation to no longer match the natural structure, because it was simply unusable. The shape of this test's input mirrors the shape we're using in production, though I've obfuscated the field names completely.

The issue appears to occur during Absinthe.Blueprint.Transform.walk.