PM2 global error caught

What's going wrong?

Stop all pm2 apps. (Restarted)

How could we reproduce this issue?

Checking from logs?

Supporting information

PM2 version          : 4.2.0
Node.js version      : 12.13.1
Debian 10 x64

Log details

2020-03-09T18:43:42: PM2 log: ===============================================================================
2020-03-09T18:43:42: PM2 log: --- PM2 global error caught ---------------------------------------------------
2020-03-09T18:43:42: PM2 log: Time                 : Mon Mar 09 2020 18:43:42 GMT+0700 (Western Indonesia Time)
2020-03-09T18:43:42: PM2 error: Cannot read property 'writable' of undefined
2020-03-09T18:43:42: PM2 error: TypeError: Cannot read property 'writable' of undefined
    at PubSocket.send (/usr/lib/node_modules/pm2/node_modules/pm2-axon/lib/sockets/pub.js:47:14)
    at EventEmitter.<anonymous> (/usr/lib/node_modules/pm2/lib/Daemon.js:445:14)
    at EventEmitter.emit (/usr/lib/node_modules/pm2/node_modules/eventemitter2/lib/eventemitter2.js:330:22)
    at Socket.forkOutData (/usr/lib/node_modules/pm2/lib/God/ForkMode.js:193:17)
    at Socket.emit (events.js:210:5)
    at Socket.EventEmitter.emit (domain.js:498:23)
    at addChunk (_stream_readable.js:309:12)
    at readableAddChunk (_stream_readable.js:290:11)
    at Socket.Readable.push (_stream_readable.js:224:10)
    at Pipe.onStreamRead (internal/stream_base_commons.js:182:23)
2020-03-09T18:43:42: PM2 log: ===============================================================================
2020-03-09T18:43:42: PM2 error: [PM2] Resurrecting PM2
internal/modules/cjs/loader.js:800
    throw err;
    ^

Error: Cannot find module '/undefined'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:797:15)
    at Function.Module._load (internal/modules/cjs/loader.js:690:27)
    at Function.Module.runMain (internal/modules/cjs/loader.js:1047:10)
    at internal/main/run_main_module.js:17:11 {
  code: 'MODULE_NOT_FOUND',
  requireStack: []
}
2020-03-09T18:43:42: PM2 log: PM2 successfully forked
2020-03-09T18:43:44: PM2 log: ===============================================================================
2020-03-09T18:43:44: PM2 log: --- New PM2 Daemon started ----------------------------------------------------
2020-03-09T18:43:44: PM2 log: Time                 : Mon Mar 09 2020 18:43:44 GMT+0700 (Western Indonesia Time)
2020-03-09T18:43:44: PM2 log: PM2 version          : 4.2.0
2020-03-09T18:43:44: PM2 log: Node.js version      : 12.13.1
2020-03-09T18:43:44: PM2 log: Current arch         : x64
2020-03-09T18:43:44: PM2 log: PM2 home             : /root/.pm2
2020-03-09T18:43:44: PM2 log: PM2 PID file         : /root/.pm2/pm2.pid
2020-03-09T18:43:44: PM2 log: RPC socket file      : /root/.pm2/rpc.sock
2020-03-09T18:43:44: PM2 log: BUS socket file      : /root/.pm2/pub.sock
2020-03-09T18:43:44: PM2 log: Application log path : /root/.pm2/logs
2020-03-09T18:43:44: PM2 log: Worker Interval      : 30000
2020-03-09T18:43:44: PM2 log: Process dump file    : /root/.pm2/dump.pm2
2020-03-09T18:43:44: PM2 log: Concurrent actions   : 2
2020-03-09T18:43:44: PM2 log: SIGTERM timeout      : 1600
2020-03-09T18:43:44: PM2 log: ===============================================================================
2020-03-09T18:43:44: PM2 log: App [pm2-logrotate:0] starting in -fork mode-
2020-03-09T18:43:44: PM2 log: App [pm2-logrotate:0] online
2020-03-09T18:43:45: PM2 log: Stopping app:pm2-logrotate id:0
2020-03-09T18:43:45: PM2 error: Cancelling versioning data parsing
2020-03-09T18:43:45: PM2 log: App [pm2-logrotate:0] exited with code [0] via signal [SIGINT]
2020-03-09T18:43:45: PM2 log: pid=23598 msg=process killed
2020-03-09T18:43:45: PM2 log: PM2 successfully stopped
2020-03-09T18:46:45: PM2 log: ===============================================================================
2020-03-09T18:46:45: PM2 log: --- New PM2 Daemon started ----------------------------------------------------
2020-03-09T18:46:45: PM2 log: Time                 : Mon Mar 09 2020 18:46:45 GMT+0700 (Western Indonesia Time)
2020-03-09T18:46:45: PM2 log: PM2 version          : 4.2.0
2020-03-09T18:46:45: PM2 log: Node.js version      : 12.13.1

Start by reproducing the restart or stop-all sequence described in the issue and inspect the stack trace locations in pm2-axon/lib/sockets/pub.js, lib/Daemon.js, and lib/God/ForkMode.js. Trace why the socket state becomes undefined and why resurrection attempts to load /undefined; done means the sequence completes without the global error or module-not-found failure.