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Description
Describe the bug
Exporting a note to PDF in CodiMD 2.6.0 crashes PhantomJS whenever the note contains certain emoji characters, which restarts the whole container.
To Reproduce
- Create or edit a note.
- Insert any emoji (e.g. 😀).
- Click Export → PDF.
- The request hangs and the container restarts.
Expected behavior
- A PDF should be generated successfully.
- The service should remain online.
Actual behavior
- PDF generation fails.
docker logsshow PhantomJS crashing withSIGFPE.- The CodiMD container restarts automatically.
Environment
| Item | Value |
|---|---|
| CodiMD ver. | 2.6.0 |
| Deployment | docker-compose |
| Node ver. | 16.20.2 (image default) |
| Base OS | Debian Buster |
| PDF engine | markdown-pdf + PhantomJS |
docker-compose excerpt (masked)
click to expand
services: codimd: image: <PRIVATE_REGISTRY>/hackmdio/hackmd:2.6.0 environment: CMD_URL_PATH: codimd CMD_DOMAIN: <YOUR_DOMAIN> CMD_PROTOCOL_USESSL: "true" QT_QPA_PLATFORM: "" # Database CMD_DB_URL: postgres://codimd:<MASKED_PW>@codimd_db/codimd # Misc CMD_EMAIL: "false" CMD_PLANTUML_SERVER: https://<YOUR_DOMAIN>/plantuml CMD_ALLOW_ANONYMOUS: "false" CMD_ALLOW_ANONYMOUS_EDITS: "false" CMD_CSP_ENABLE: "false"
Logs (full excerpt)
2025年07月09日T06:13:04.445Z info: <MASKED_IP> - - [09/Jul/2025:06:13:04 +0000] "GET /me HTTP/1.1" 304 - "https://<YOUR_DOMAIN>/codimd/ixLMZtInSNiOnrbOkQ-Q_w" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36 Edg/138.0.0.0"
2025年07月09日T06:13:06.517Z info: <MASKED_IP> - - [09/Jul/2025:06:13:06 +0000] "GET /uploads/upload_845dbee74d2337302b91fb126a4691db.png HTTP/1.1" 200 32405 "https://<YOUR_DOMAIN>/codimd/ixLMZtInSNiOnrbOkQ-Q_w" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36 Edg/138.0.0.0"
2025年07月09日T06:13:20.968Z info: deserializeUser: c35f23dd-2732-46b7-9283-15b14eac234b
2025年07月09日T06:13:21.478Z error: uncaughtException: Command failed: /home/hackmd/app/node_modules/phantomjs-prebuilt/lib/phantom/bin/phantomjs /home/hackmd/app/node_modules/markdown-pdf/phantom/render.js /tmp/tmp-<MASKED>.html /tmp/tmp-<MASKED>.pdf /home/hackmd/app /home/hackmd/app/node_modules/markdown-pdf/runnings.js /home/hackmd/app/node_modules/markdown-pdf/css/pdf.css /home/hackmd/app/node_modules/highlight.js/styles/github-gist.css A4 portrait 2cm 0 10000
PhantomJS has crashed. Please read the bug reporting guide at
<http://phantomjs.org/bug-reporting.html> and file a bug report.
Error: Command failed: /home/hackmd/app/node_modules/phantomjs-prebuilt/lib/phantom/bin/phantomjs /home/hackmd/app/node_modules/markdown-pdf/phantom/render.js /tmp/tmp-<MASKED>.html /tmp/tmp-<MASKED>.pdf /home/hackmd/app /home/hackmd/app/node_modules/markdown-pdf/runnings.js /home/hackmd/app/node_modules/markdown-pdf/css/pdf.css /home/hackmd/app/node_modules/highlight.js/styles/github-gist.css A4 portrait 2cm 0 10000
PhantomJS has crashed. Please read the bug reporting guide at
<http://phantomjs.org/bug-reporting.html> and file a bug report.
at ChildProcess.exithandler (node:child_process:402:12)
at ChildProcess.emit (node:events:513:28)
at maybeClose (node:internal/child_process:1100:16)
at Socket.<anonymous> (node:internal/child_process:458:11)
at Socket.emit (node:events:513:28)
at Pipe.<anonymous> (node:net:301:12)
2025年07月09日T06:13:21.481Z error: Process will exit now.
Info: try to connect to tcp://codimd_db in port 5432
2025年07月09日 06:13:22 portchecker.go:56: dial tcp codimd_db:5432: connect: connection success
Possible cause / context
- Matches Rendering Emojis hajareshyam/pdf-creator-node#45 — PhantomJS cannot render certain emoji/Unicode glyphs.
- Removing all emoji lets the export succeed → strong evidence of an encoding issue.
- PhantomJS is unmaintained; CodiMD relies on it via
markdown-pdf.
Potential solutions
- Upgrade to CodiMD 3.x (if it has moved to a Chromium/Puppeteer backend).
- Replace PhantomJS with Puppeteer/Playwright in a custom build.
- Test latest
phantomjs-prebuiltpatch to confirm whether the crash persists.
Help wanted
- Can maintainers reproduce this crash with an emoji-containing note?
- Is there an official plan to migrate away from PhantomJS?
- Any patch or workaround would be greatly appreciated.
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