Question: how to reload config while ports are in use?

[KjellVerb]

I want to be able to add and remove ports on the fly, without impacting other ports.
The idea was to edit ser2net.yaml and then issue a "reload" command in the admin console, but this only works when all ports are disconnected. If a port is still open, this is the result:

Feb 05 12:27:56 DietPi ser2net[38798]: Got admin request, re-reading configuration
Feb 05 12:28:01 DietPi ser2net[38798]: ser2net: port.c:707: shutdown_port: Assertion `err == 0' failed.
Feb 05 12:28:01 DietPi systemd[1]: ser2net.service: Main process exited, code=killed, status=6/ABRT

Is there a way to achieve my goal of editing the config without impacting open connections?

[KjellVerb]

No idea what caused the behavior to change, but now it only fails after two consecutive reloads, and with a different error:

Feb 05 16:18:45 DietPi systemd[1]: Starting ser2net.service - Serial port to network proxy...
Feb 05 16:18:45 DietPi systemd[1]: Started ser2net.service - Serial port to network proxy.
Feb 05 16:18:59 DietPi ser2net[58374]: Got admin request, re-reading configuration
Feb 05 16:19:13 DietPi ser2net[58374]: Got admin request, re-reading configuration
Feb 05 16:19:13 DietPi systemd[1]: ser2net.service: Main process exited, code=killed, status=11/SEGV
Feb 05 16:19:13 DietPi systemd[1]: ser2net.service: Failed with result 'signal'.

[cminyard]

On Thu, Feb 05, 2026 at 03:41:14AM -0800, KjellVerb wrote: KjellVerb created an issue (cminyard/ser2net#152) I want to be able to add and remove ports on the fly, without impacting other ports. The idea was to edit ser2net.yaml and then issue a "reload" command in the admin console, but this only works when all ports are disconnected. If a port is still open, this is the result: ``` Feb 05 12:27:56 DietPi ser2net[38798]: Got admin request, re-reading configuration Feb 05 12:28:01 DietPi ser2net[38798]: ser2net: port.c:707: shutdown_port: Assertion `err == 0' failed. Feb 05 12:28:01 DietPi systemd[1]: ser2net.service: Main process exited, code=killed, status=6/ABRT ``` Is there a way to achieve my goal of editing the config without impacting open connections?

It's supposed to work that way, so it's a bug. What version of ser2net are you using? (Can you try the newest version if it's not current?) Can you include your config to help me reproduce?

…

-corey

[KjellVerb]

I'm currently using 4.6.4, which is what I got from the debian trixie apt repositories.
How should I upgrade to the newest one?

Details

root@DietPi:~# apt show ser2net libgensio6t64
Package: ser2net
Version: 4.6.4-1
Priority: optional
Section: utils
Maintainer: ser2net Maintainers <ser2net@packages.debian.org>
Installed-Size: 294 kB
Pre-Depends: init-system-helpers (>= 1.58)
Depends: libc6 (>= 2.34), libgensio6t64 (>= 2.8.13-2), libpam0g (>= 0.99.7.1), libyaml-0-2
Suggests: telnet | telnet-client
Homepage: https://github.com/cminyard/ser2net
Tag: interface::daemon, network::server, role::program, use::proxying,
 use::transmission
Download-Size: 90.2 kB
APT-Manual-Installed: yes
APT-Sources: https://deb.debian.org/debian trixie/main arm64 Packages
Description: Serial port to network proxy

Package: libgensio6t64
Version: 2.8.13-7
Priority: optional
Section: libs
Source: gensio
Maintainer: gensio Maintainers <gensio@packages.debian.org>
Installed-Size: 2888 kB
Provides: libgensio6 (= 2.8.13-7)
Depends: libasound2t64 (>= 1.0.16), libavahi-client3 (>= 0.6.16), libavahi-common3 (>= 0.6.16), libc6 (>= 2.38), libgcc-s1 (>= 3.0), libglib2.0-0t64 (>= 2.32.0), libopenipmi0t64 (>= 2.0.36), libpython3.13 (>= 3.13.0~rc3), libsctp1 (>= 1.0.19+dfsg), libssl3t64 (>= 3.0.0), libstd
c++6 (>= 5.2), libudev1 (>= 183), libwrap0 (>= 7.6-4~)
Conflicts: libgensio4
Breaks: libgensio6 (<< 2.8.13-7)
Replaces: libgensio4, libgensio6
Homepage: https://github.com/cminyard/gensio
Download-Size: 305 kB
APT-Manual-Installed: no
APT-Sources: https://deb.debian.org/debian trixie/main arm64 Packages
Description: abstract stream I/O (runtime files)

And this is my config:

Details

%YAML 1.1
---
admin: &admin
    accepter: tcp,9000

connection: &20100
    accepter: telnet,tcp,20100
    enable: on
    options:
        banner: \r\nSer2net host DietPi-100.124.107.100:20100 [115200N81] \r\n\r\n
        kickolduser: true
        max-connections: 1
    connector: serialdev,/dev/serial/by-path/platform-fd500000.pcie-pci-0000:01:00.0-usb-0:1.2.4:1.0-port0,115200N81,local

connection: &20101
    accepter: telnet,tcp,20101
    enable: on
    options:
        banner: \r\nSer2net host DietPi-100.124.107.100:20101 [115200N81] \r\n\r\n
        kickolduser: true
        max-connections: 1
    connector: serialdev,/dev/serial/by-path/platform-fd500000.pcie-pci-0000:01:00.0-usb-0:1.2.4:1.1-port0,115200N81,local

connection: &20102
    accepter: telnet,tcp,20102
    enable: on
    options:
        banner: \r\nSer2net host DietPi-100.124.107.100:20102 [115200N81] \r\n\r\n
        kickolduser: true
        max-connections: 1
    connector: serialdev,/dev/serial/by-path/platform-fd500000.pcie-pci-0000:01:00.0-usb-0:1.2.4:1.2-port0,115200N81,local

connection: &20103
    accepter: telnet,tcp,20103
    enable: on
    options:
        banner: \r\nSer2net host DietPi-100.124.107.100:20103 [115200N81] \r\n\r\n
        kickolduser: true
        max-connections: 1
    connector: serialdev,/dev/serial/by-path/platform-fd500000.pcie-pci-0000:01:00.0-usb-0:1.2.4:1.3-port0,115200N81,local

connection: &20700
    accepter: telnet,tcp,20700
    enable: on
    options:
        banner: \r\nSer2net host DietPi-100.124.107.100:20700 [115200N81] \r\n\r\n
        kickolduser: true
        max-connections: 1
    connector: serialdev,/dev/serial/by-path/platform-fd500000.pcie-pci-0000:01:00.0-usb-0:1.2.7:1.0-port0,115200N81,local

Which maps to this USB tree:

Details

/:  Bus 001.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/1p, 480M
    |__ Port 001: Dev 002, If 0, Class=Hub, Driver=hub/4p, 480M
        |__ Port 002: Dev 003, If 0, Class=Hub, Driver=hub/7p, 480M
            |__ Port 004: Dev 004, If 0, Class=Vendor Specific Class, Driver=cp210x, 12M
            |__ Port 004: Dev 004, If 1, Class=Vendor Specific Class, Driver=cp210x, 12M
            |__ Port 004: Dev 004, If 2, Class=Vendor Specific Class, Driver=cp210x, 12M
            |__ Port 004: Dev 004, If 3, Class=Vendor Specific Class, Driver=cp210x, 12M
            |__ Port 007: Dev 005, If 0, Class=Vendor Specific Class, Driver=pl2303, 12M
/:  Bus 002.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/4p, 5000M

[cminyard]

On Thu, Feb 05, 2026 at 11:47:30AM -0800, KjellVerb wrote: KjellVerb left a comment (cminyard/ser2net#152) I'm currently using 4.6.4, which is what I got from the debian trixie apt repositories. How should I upgrade to the newest one?

That's pretty current, I doubt it something fixed since then. Could you send me your config and how to reproduce?

[KjellVerb]

The ser2net config is posted inline in my previous message and attached here as a file:
ser2net.yaml

I'm running this on a Raspberry Pi 4, with two USB-to-serial converters connected through a 7-port hub (see USB tree in previous message).
The first four ports are connected to a CP2108 device and the last port is connected to a PL2303 device.

To reproduce, I take the following steps:

• restart ser2net service
• open telnet to admin port
• issue multiple reload commands (no problems seen)
• open telnet to any of the serial device ports
• issue reload (no problems seen)
• issue second reload (all ports close and the aforementioned ser2net status=11/SEGV shows)

PS: thanks for having a look!