gistfile1.txt

λ (master) node mw-ocg-service.js
info: Frontend server starting on all IP interfaces, port 17080 channel=frontend
info: Frontend server starting on all IP interfaces, port 17080 channel=frontend
info: Starting request 1410565041316-15722 for 127.0.0.1, HTTP 1.0 POST / channel=frontend.request, id=1410565041316-15722, clientip=127.0.0.1, version=1.0, method=POST, url=/
info: Adding job with id 25170dcce633041b7d19ad7e87b51a4876694210 to redis for 1410565041316-15722 channel=frontend, id=1410565041316-15722, id=25170dcce633041b7d19ad7e87b51a4876694210
info: Got new job "25170dcce633041b7d19ad7e87b51a4876694210", attempting to get status details and launching channel=backend, id=25170dcce633041b7d19ad7e87b51a4876694210
info: Backend worker now picking up job 25170dcce633041b7d19ad7e87b51a4876694210 for writer rdf2latex channel=backend, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex
info: Forking bundler to create /var/folders/b4/g_kzcqyn1575jvpn46n01rhr0000gn/T/25170dcce633041b7d19ad7e87b51a4876694210.zip from /var/folders/b4/g_kzcqyn1575jvpn46n01rhr0000gn/T/25170dcce633041b7d19ad7e87b51a4876694210.json channel=backend.bundler, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex
info: Starting request 1410565041437-23194 for 127.0.0.1, HTTP 1.0 POST / channel=frontend.request, id=1410565041437-23194, clientip=127.0.0.1, version=1.0, method=POST, url=/
info: [0%] Fetching wiki configuration channel=backend.bundler.bin, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex, details=undefined
info: [0%] Fetching wiki configuration: http://ve channel=backend.bundler.bin, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex, details=undefined
info: [5%] Fetching wiki configuration:   channel=backend.bundler.bin, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex, details=undefined
info: [10%] Fetching wiki configuration: localhost siteinfo channel=backend.bundler.bin, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex, details=undefined
info: [20%] Fetching parsed articles channel=backend.bundler.bin, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex, details=undefined
info: [20%] Fetching parsed articles: collection undefined channel=backend.bundler.bin, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex, details=undefined
info: [28%] Fetching parsed articles: localhost:Two [Parsoid, revision 2] channel=backend.bundler.bin, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex, details=undefined
info: Starting request 1410565041927-60876 for 127.0.0.1, HTTP 1.0 POST / channel=frontend.request, id=1410565041927-60876, clientip=127.0.0.1, version=1.0, method=POST, url=/
info: [30%] Fetching parsed articles: localhost:Two [authors, revision 2] channel=backend.bundler.bin, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex, details=undefined
info: [33%] Fetching parsed articles: localhost:Two [complete] channel=backend.bundler.bin, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex, details=undefined
info: [40%] Fetching media channel=backend.bundler.bin, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex, details=undefined
info: [60%] Creating attribution page channel=backend.bundler.bin, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex, details=undefined
info: [60%] Creating attribution page: chapter contributors channel=backend.bundler.bin, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex, details=undefined
info: [67%] Creating attribution page: image contributors channel=backend.bundler.bin, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex, details=undefined
info: [73%] Creating attribution page: localhost:<custom wikitext> [Parsoid] channel=backend.bundler.bin, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex, details=undefined
info: [80%] Creating bundle channel=backend.bundler.bin, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex, details=undefined
info: [100%] Done channel=backend.bundler.bin, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex, details=undefined
info: Bundle completed successfully! channel=backend.bundler, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex
info: Forking renderer to produce /var/folders/b4/g_kzcqyn1575jvpn46n01rhr0000gn/T/ocg-output/25170dcce633041b7d19ad7e87b51a4876694210.pdf from /var/folders/b4/g_kzcqyn1575jvpn46n01rhr0000gn/T/25170dcce633041b7d19ad7e87b51a4876694210.zip channel=backend.bundler, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex
info: [0%] Creating work space channel=backend.renderer.bin, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex, details=undefined
info: [25%] Processing media files channel=backend.renderer.bin, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex, details=undefined
info: [50%] Processing collection channel=backend.renderer.bin, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex, details=undefined
info: [50%] Processing collection channel=backend.renderer.bin, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex, details=undefined
info: [58%] Processing: article channel=backend.renderer.bin, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex, details=undefined
info: [67%] Processing: attribution channel=backend.renderer.bin, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex, details=undefined
info: [75%] Compiling PDF channel=backend.renderer.bin, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex, details=undefined

events.js:72
        throw er; // Unhandled 'error' event
              ^
Error: spawn ENOENT
    at errnoException (child_process.js:1001:11)
    at Process.ChildProcess._handle.onexit (child_process.js:792:34)
info: Starting request 1410565042530-96342 for 127.0.0.1, HTTP 1.0 POST / channel=frontend.request, id=1410565042530-96342, clientip=127.0.0.1, version=1.0, method=POST, url=/
error: Rendering process died with non zero code: 8 channel=backend.bundler.error, id=25170dcce633041b7d19ad7e87b51a4876694210, writer=rdf2latex, metabook={
  "type": "collection",
  "licenses": [
    {
      "type": "license",
      "name": "License",
      "mw_rights_icon": "",
      "mw_rights_page": "",
      "mw_rights_url": "",
      "mw_rights_text": ""
    }
  ],
  "items": [
    {
      "type": "article",
      "content_type": "text/x-wiki",
      "title": "Two",
      "revision": "2",
      "timestamp": "1410564881"
    }
  ],
  "wikis": [
    {
      "type": "wikiconf",
      "baseurl": "http://ve",
      "script_extension": ".php",
      "format": "nuwiki",
      "parsoid": "http://localhost:8000",
      "prefix": "localhost"
    }
  ]
}, name=BundlerError, message=Rendering process died with non zero code: 8, stack=BundlerError: Rendering process died with non zero code: 8
    at ChildProcess.<anonymous> (/Users/arlolra/Work/Wikimedia/ocg/mw-ocg-service/lib/threads/backend.js:533:15)
    at ChildProcess.emit (events.js:98:17)
    at Process.ChildProcess._handle.onexit (child_process.js:810:12)
info: Starting request 1410565043092-07896 for 127.0.0.1, HTTP 1.0 POST / channel=frontend.request, id=1410565043092-07896, clientip=127.0.0.1, version=1.0, method=POST, url=/
info: Starting request 1410565043228-46253 for 127.0.0.1, HTTP 1.0 POST / channel=frontend.request, id=1410565043228-46253, clientip=127.0.0.1, version=1.0, method=POST, url=/

Hm. Could you try running mw-ocg-latexer standalone (with the instructions in mw-ocg-latexer/README.md)? The -D option should give a better stack trace for this. (Patches welcome to get a better stack trace exported from mw-ocg-latexer for this as well.)

I hit the same issue rendering the example bundle from the mw-ocg-bundler README.md (bin/mw-ocg-bundler -v -o bundle.zip --prefix enwiki "United States") on Ubuntu 14.04.

I ran mw-ocg-latexer standalone with -D but the stack trace looks the same:
[75%] Compiling PDF

events.js:72
throw er; // Unhandled 'error' event
^
Error: spawn ENOENT
at errnoException (child_process.js:988:11)
at Process.ChildProcess._handle.onexit (child_process.js:779:34)

My problem was resolve by installing the system dependencies given at https://github.com/wikimedia/mediawiki-extensions-Collection-OfflineContentGenerator-latex_renderer

I had been following the instructions at https://wikitech.wikimedia.org/wiki/OCG#Installing_a_development_instance

which did not mention these dependencies.