Node-RED crash (SIGSEGV) when any writable file is set as the serial device

Question

Node-RED crash (SIGSEGV) when any writable file is set as the serial device

Matthew-Kirk opened this issue 2 years ago · 6 comments

Matthew-Kirk commented 2 years ago

Which node-red-contrib-modbus version are you using?

5.25.0

What happened?

Version of node.js? (should be >= 16)

v16.16.0

Version of Node-RED? (should be >= 3)

v3.0.2

Version of node-red-contrib-modbus? (should be >= 5)

v5.25.0

What is your platform? (Linux, macOS, ...)

Linux (Balena OS on Raspberry Pi)

Using the official Docker image

What does DEBUG=contribModbus:,modbus-serial node-red -v log? (log files are welcome)

Welcome to Node-RED
===================

20 Jan 10:54:50 - [info] Node-RED version: v3.0.2
20 Jan 10:54:50 - [info] Node.js  version: v16.16.0
20 Jan 10:54:50 - [info] Linux 5.10.95-v8 arm64 LE
20 Jan 10:54:54 - [info] Loading palette nodes
20 Jan 10:54:55 - [debug] Module: node-red-contrib-modbus 5.25.0 /data/node_modules/node-red-contrib-modbus
20 Jan 10:54:55 - [debug] Module: node-red-dashboard 3.3.1 /data/node_modules/node-red-dashboard
20 Jan 10:54:55 - [debug] Module: node-red-contrib-stoptimer-varidelay 0.5.2 /usr/src/node-red/node_modules/node-red-contrib-stoptimer-varidelay
20 Jan 10:55:00 - [info] Dashboard version 3.3.1 started at /ui
20 Jan 10:55:00 - [info] Settings file  : /data/settings.js
20 Jan 10:55:00 - [info] Context store  : 'default' [module=memory]
20 Jan 10:55:00 - [info] User directory : /data
20 Jan 10:55:00 - [warn] Projects disabled : set editorTheme.projects.enabled=true to enable
20 Jan 10:55:00 - [info] Flows file     : /data/flows.json
20 Jan 10:55:00 - [info] Server now running at http://127.0.0.1:1880/
20 Jan 10:55:00 - [debug] loaded flow revision: ca1b2db29b26aac1d5cc662158cbc46c
20 Jan 10:55:00 - [debug] red/runtime/nodes/credentials.load : no user key present
20 Jan 10:55:00 - [debug] red/runtime/nodes/credentials.load : using default key
20 Jan 10:55:00 - [debug] red/runtime/nodes/credentials.load : keyType=system
20 Jan 10:55:00 - [trace] runtime event: {"id":"runtime-state","retain":true}
20 Jan 10:55:00 - [trace] runtime event: {"id":"runtime-deploy","payload":{"revision":"ca1b2db29b26aac1d5cc662158cbc46c"},"retain":true}
20 Jan 10:55:01 - [info] Starting flows
20 Jan 10:55:01 - [debug] red/nodes/flows.start : starting flow : global
20 Jan 10:55:01 - [debug] red/nodes/flows.start : starting flow : 2ce6df32-439c-428e-bc8a-bfc3053d71e7
20 Jan 10:55:01 - [debug] red/nodes/flows.start : starting flow : f2a00bec621417c5
20 Jan 10:55:01 - [trace] [flow:global] start flow [global]
  contribModbus:queue:core queue serial lock command node name: Modbus Server id: 2995c31d.ca614c +0ms
20 Jan 10:55:01 - [info] Started flows
./entrypoint.sh: line 14:     7 Segmentation fault      (core dumped) /usr/local/bin/node $NODEOPTIONS node_modules/node-red/red.js --userDir /data $FLOWS

(excess details like flow logs omitted for brevity as the flow is below, though they can be given if needed)

Flow file

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Hi there,

We're having an issue where Node-RED is crashing at startup if the Modbus server is given a serial port to which it has write access. Initially Node-RED was not crashing because we hadn't yet given the Docker container write access to /dev/ttyUSB0. This was solved by adding the node-red user inside the container to the dialout group however it surfaced this crashing issue. Some more investigation showed this same behaviour can be replicated by specifying any file that exists and is writable. E.g., if the serial port is set to /tmp/foobar when it does not exist, Node-RED is fine, but as soon as a regular file is created with that name, Node-RED crashes in the same way.

We have been able to replicate this with v2 and v3 of Node-RED.

Server

Modbus-Server Node

How can this be reproduced?

Import the flow
Set the serial port on the Modbus server to an appropriate device file, or any extant regular file
Deploy the changes and watch the logs for a segfault

What did you expect to happen?

No response

Other Information

No response

Answer 1 · 2023-02-17T13:51:47.000Z

Hi there,

To give an update to this: we found the problem actually lies within the https://www.npmjs.com/package/modbus-serial package while running on Alpine Linux. Moving from the official Node-RED Docker Hub package (which uses Alpine) to Debian fixed the issue.

My guess is something in the chain depends on a peculiarity or a non-standard feature within glibc that musl-powered Alpine gets stuck on.

This issue can probably be closed, perhaps with a note somewhere that there may be issues using this package on Alpine?

Answer 2 · 2023-03-02T20:17:53.000Z

I'm seeing the same when using the official Node-RED Docker Hub package.

I agree... if this really can't work with those official Docker images, it should probably be noted somewhere since this project is specifically a Node-RED module.

Answer 3 · 2023-03-05T19:34:22.000Z

Resolved this issue for me

node-red-contrib-modbus works fine with official Node-RED Docker images if the npm command includes --unsafe-perm --build-from-source.

So in my case, in my Dockerfile I changed...

RUN cd /data && npm install --only=production

...to...

RUN cd /data && npm install --only=production --unsafe-perm --build-from-source

Also, this works for both versions 5.21 and 5.25.

Answer 4 · 2023-03-15T21:42:50.000Z

@papakpmartin

Could you please post the actual dockerfile you are using that works for you ?
thanks

Answer 5 · 2023-03-16T01:11:47.000Z

Sure! Here's the basics of what is now working for me:

FROM nodered/node-red:2.2.2-14

# Copy package.json to /data so npm installs the added modules for Node-RED
COPY package.json /data/package.json

# Install inside /data. Doing otherwise may wreck the Node-RED installation
RUN cd /data && npm install --only=production --unsafe-perm --build-from-source

# Copy _your_ Node-RED project files into place
COPY settings.js /data/settings.js
COPY flows.json /data/flows.json

# Start the container normally
CMD ["npm", "start"]

Answer 6 · 2023-05-15T01:54:22.000Z

This issue is stale because it has been open 60 days with no activity. It will be closed in 30 days, but can be saved by removing the stale label or commenting.