Emscripten Memory Leak on node.js

leak.c

#include <stdio.h>
#include <stdlib.h>

int main() {
    printf("this is a test\n");
}

leak.js

let factory = require("./build/test.js");
const RESTART_WAIT = 10;
const BYTES_PER_KB = 1024;
let runCount = 0;

// create the emscripten Module
function createModule() {
    return {
        // undocumented emscripten function; called right before completion of the run
        quit: function(errorCode) {
            console.info(`Run # ${runCount} completed with status:`, errorCode);
            run();
        },
    };
}

// run the WASM code
function run() {
    runCount++;
    console.info(`Starting run #${runCount}`);
    reportMemory();

    setTimeout(() => {
        factory(createModule());
    }, RESTART_WAIT);
}

// print current memory usage
function reportMemory() {
    let {rss, heapTotal, heapUsed, external, arrayBuffers} = process.memoryUsage();
    let percentHeap = (heapUsed / heapTotal) * 100;
    console.debug(`Heap Usage: ${b2s(heapUsed)} (${percentHeap.toFixed(1)}% of ${b2s(heapTotal)}) :: ArrayBuffers: ${b2s(arrayBuffers)}   External: ${b2s(external)}   [Total Memory (RSS): ${b2s(rss)}]`);

    // # bytes to string
    function b2s(b) {
        let size = 0;

        while (b > BYTES_PER_KB) {
            b = b / BYTES_PER_KB;
            size++;
        }

        switch (size) {
        case 0: return `${b.toFixed(2)} B`;
        case 1: return `${b.toFixed(2)} KB`;
        case 2: return `${b.toFixed(2)} MB`;
        case 3: return `${b.toFixed(2)} GB`;
        case 4: return `${b.toFixed(2)} TB`;
        default: return `${b.toFixed(2)} ??`;
        }
    }
}

run();

Makefile

CC=emcc
CFLAGS =
CFLAGS += -Wall
CFLAGS += -Werror
CFLAGS += -s MODULARIZE
CFLAGS += -s EXIT_RUNTIME

all:
	emcc leak.c $(CFLAGS) -o build/test.js

output

$ make && node leak.js

emcc leak.c  -Wall -Werror -s MODULARIZE -s EXIT_RUNTIME -o build/test.js
Starting run #1
Heap Usage: 2.76 MB (52.5% of 5.26 MB) :: ArrayBuffers: 9.17 KB   External: 1.04 MB   [Total Memory (RSS): 19.52 MB]
this is a test
Run # 1 completed with status: 0
Starting run #2
Heap Usage: 3.35 MB (60.7% of 5.51 MB) :: ArrayBuffers: 30.03 KB   External: 16.97 MB   [Total Memory (RSS): 24.09 MB]
this is a test
Run # 2 completed with status: 0
Starting run #3
Heap Usage: 3.27 MB (39.6% of 8.26 MB) :: ArrayBuffers: 9.18 KB   External: 32.95 MB   [Total Memory (RSS): 28.20 MB]
this is a test
Run # 3 completed with status: 0
Starting run #4
Heap Usage: 3.38 MB (40.9% of 8.26 MB) :: ArrayBuffers: 30.05 KB   External: 48.97 MB   [Total Memory (RSS): 28.26 MB]
this is a test
Run # 4 completed with status: 0
Starting run #5
Heap Usage: 2.77 MB (33.5% of 8.26 MB) :: ArrayBuffers: 30.06 KB   External: 64.97 MB   [Total Memory (RSS): 28.73 MB]
this is a test

[...]

Starting run #101
Heap Usage: 7.15 MB (43.9% of 16.31 MB) :: ArrayBuffers: 30.81 KB   External: 1.56 GB   [Total Memory (RSS): 36.96 MB]
this is a test
Run # 101 completed with status: 0
Starting run #102
Heap Usage: 7.24 MB (44.4% of 16.31 MB) :: ArrayBuffers: 51.68 KB   External: 1.58 GB   [Total Memory (RSS): 37.00 MB]
this is a test
Run # 102 completed with status: 0
Starting run #103
Heap Usage: 7.23 MB (44.3% of 16.31 MB) :: ArrayBuffers: 9.96 KB   External: 1.59 GB   [Total Memory (RSS): 37.09 MB]
/Users/ampower/Projects/proto/emscripten-memory-leak/build/test.js:201
      throw ex;
      ^

RangeError: WebAssembly.Memory(): could not allocate memory
    at /Users/ampower/Projects/proto/emscripten-memory-leak/build/test.js:1414:18
    at Timeout._onTimeout (/Users/ampower/Projects/proto/emscripten-memory-leak/leak.js:24:9)
    at listOnTimeout (internal/timers.js:551:17)
    at processTimers (internal/timers.js:494:7)