Crashes when using ajv on Alpine Linux

Version:
Happens on 4.x, 6.x and 7.x.
Platform:
Alpine Linux 3.4
Subsystem:
v8

There's an issue open for docker-node here and it has a backtrace from gdb.

Running this script reproduces the crash:

#!/usr/bin/env node
'use strict';

const Ajv = require('ajv');
const validator = new Ajv({ allErrors: true, extendedRefs: false });

const STRING_KEY = {
    id: '/StringKey',
    type: 'string',
    maxLength: 10000,
};

validator.addSchema(STRING_KEY);

let schema = {
    type: 'object',
    properties: {},
};

const NUM_COLUMNS = parseInt(process.argv[2] || '81');
console.log(`Testing with ${NUM_COLUMNS} columns`);
let c;
for (c=0; c<NUM_COLUMNS; c++) {
    schema.properties[`s${c}`] = { $ref: '/StringKey'};
}
console.log('schema:', schema);
const validate = validator.compile(schema);

let value = {};
for (c=0; c<NUM_COLUMNS; c++) {
    const cS = `s${c}`;
    value[cS] = '';
}
console.log('value:', value);

const NUM_ROWS = parseInt(process.argv[3] || '394');
console.log(`Testing with ${NUM_ROWS} rows`);
let r;
for (r=0; r<NUM_ROWS; r++) {
    validate(value);
}

console.log('Done');

I used this Dockerfile to run the test (also crashes when using FROM node:4.8.0-alpine and FROM node:7.7.3-alpine:

FROM node:6.10.0-alpine

RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app

RUN yarn add ajv

COPY test_ajv.js /usr/src/app

CMD [ "node", "test_ajv.js" ]

And ran these commands:

docker build -t test_ajv .
docker run --rm -it test_ajv sh
node test_ajv.js