Node.js catch ENOMEM error thrown after spawn

Question

My Node.js script crashes because of a thrown ENOMEM (Out of memory) errnoException when using spawn.

The error:

child_process.js:935   throw errnoException(process._errno, 'spawn');         ^  Error: spawn ENOMEM   at errnoException (child_process.js:988:11)   at ChildProcess.spawn (child_process.js:935:11)   at Object.exports.spawn (child_process.js:723:9)   at module.exports ([...]/node_modules/zbarimg/index.js:19:23) 

I'm already using listeners for the error and exit event, but non of them getting fired in case of this error.

My code:

zbarimg = process.spawn('zbarimg', [photo, '-q']); zbarimg.on('error', function(err) { ... }); zbarimg.on('close', function(code) { ... });  

Full source code available.

Is there anything I can do to prevent the script from crashing? How do I catch the thrown ENOMEM error?

Answer 1

I had the same problem and as it turned out, my system had no swap space enabled. Check if this is the case by running the command free -m:

vagrant@vagrant-ubuntu-trusty-64:~$ free -m              total       used       free     shared    buffers     cached Mem:          2002        233       1769          0         24         91 -/+ buffers/cache:        116       1885 Swap:            0          0          0 

Looking at the bottom row we can see we have a total of 0 bytes swap memory. Not good. Node can get pretty memory hungry and if no swap space is available when memory runs out, errors are bound to happen.

The method for adding a swap file varies between operating systems and distributions, but if you're running Ubuntu like me you can follow these instructions on adding a swap file:

1. sudo fallocate -l 4G /swapfile Create a 4 gigabyte swapfile
2. sudo chmod 600 /swapfile Secure the swapfile by restricting access to root
3. sudo mkswap /swapfile Mark the file as a swap space
4. sudo swapon /swapfile Enable the swap
5. echo "/swapfile none swap sw 0 0" | sudo tee -a /etc/fstab Persist swapfile over reboots (thanks for the tip, bman!)