[Bug 1839156] Re: TCP/IP connection stuck when called from UDEV rule

[Nick Rosbrook]

udev restricts this sort of thing for security reasons, so this is
working as expected.

** Changed in: systemd (Ubuntu)
       Status: New => Invalid

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Title:
  TCP/IP connection stuck when called from UDEV rule

Status in systemd package in Ubuntu:
  Invalid

Bug description:
  It seems that in Eoan there is a lock/any other issue preventing
  particular system calls to be executed by the triggered action
  handler. I have an action executing wget when USB-serial adapter is
  plugged:

  SUBSYSTEM=="tty", ACTION=="add", ATTRS{idVendor}=="1a86", ATTRS{idProduct}=="7523", MODE="0666", RUN+="/usr/bin/wget -v --method=POST http://127.0.0.1:4000/udev_trigger/add"
  This action works perfectly in a prior versions - but in Eoan Ermine it hangs for ~30s and fails on a timeout. Analysis with strace shows that execution is stuck on connect() syscall - until it returns with ETIMEDOUT.

  Same Wget command, being run from a command line, works perfectly.

  The issue doesn't seem to be related to a particular IP
  (localhost/remote) and/or the status of a listener process - execution
  hangs also when listener is not running and port is free.

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