[Bug]: unoserver crash loop on startup (v2.11.0, :latest Standard)

[ToledoEM]

Installation Method

Docker

The Problem

Since v2.11.0 (PR #6328), the :latest slim image now ships unoserver. On startup, unoserver fails to bind port 2003 with OSError: [Errno 98] Address already in use, the watcher restarts it immediately, and it fails again — no backoff, no exit. The loop runs indefinitely. The main app starts fine. LibreOffice-based conversions don't work.

Logs:

INFO:unoserver:Failed to start servers
unoserver PID 1242 not found for port 2003
Restarting unoserver on 127.0.0.1:2003 (uno-port 2004)

OSError: [Errno 98] Address already in use
INFO:unoserver:Failed to start servers

Environment: stirlingtools/stirling-pdf:latest (slim, without LibreOffice) v2.11.0, running as a Home Assistant add-on (single container, no host-level port conflicts).

Expected: unoserver starts cleanly, or fails once with a clear error and stops retrying. unoserver is a LibreOffice bridge

EDITED it should not be included in the slim image where LibreOffice is absent.

Version of Stirling-PDF

2.11.0

Last Working Version of Stirling-PDF

2.10.1

Page Where the Problem Occurred

No response

Docker Configuration

# hadolint ignore=DL3007
FROM stirlingtools/stirling-pdf:latest

# Install s6-overlay and bashio (HA supervisor tooling)
ARG S6_OVERLAY_VERSION=3.2.0.2
# hadolint ignore=DL3008
RUN apt-get update \
    && apt-get install -y --no-install-recommends \
         curl \
         xz-utils \
         jq \
    && rm -rf /var/lib/apt/lists/* \
    && ARCH="$(dpkg --print-architecture)" \
    && case "$ARCH" in \
         amd64)   S6_ARCH="x86_64"   ;; \
         arm64)   S6_ARCH="aarch64"  ;; \
         *) echo "Unsupported arch: $ARCH"; exit 1 ;; \
       esac \
    && curl -fsSL "https://github.com/just-containers/s6-overlay/releases/download/v${S6_OVERLAY_VERSION}/s6-overlay-noarch.tar.xz" \
       | tar -C / -Jxp \
    && curl -fsSL "https://github.com/just-containers/s6-overlay/releases/download/v${S6_OVERLAY_VERSION}/s6-overlay-${S6_ARCH}.tar.xz" \
       | tar -C / -Jxp \
    && mkdir -p /usr/lib/bashio \
    && curl -fsSL "https://github.com/hassio-addons/bashio/archive/refs/heads/main.tar.gz" \
       | tar -C /usr/lib/bashio --strip-components=2 -xz bashio-main/lib \
    && ln -sf /usr/lib/bashio/bashio /usr/bin/bashio \
    && printf '#!/usr/bin/env bash\n. /usr/lib/bashio/bashio.sh\nexec "$@"\n' > /usr/bin/with-contenv \
    && chmod +x /usr/bin/with-contenv \
    && apt-get purge -y --auto-remove curl xz-utils

COPY run.sh /run.sh
COPY rootfs /

RUN chmod +x /run.sh \
    && chmod +x /etc/s6-overlay/s6-rc.d/stirling_pdf/run \
    && chmod +x /etc/s6-overlay/s6-rc.d/stirling_pdf/finish

ARG BUILD_VERSION
LABEL \
  io.hass.version="${BUILD_VERSION}" \
  io.hass.type="addon" \
  io.hass.arch="aarch64|amd64"

ENTRYPOINT ["/init"]

Relevant Log Output

INFO:unoserver:Failed to start servers
unoserver PID 1343 not found for port 2003
Restarting unoserver on 127.0.0.1:2003 (uno-port 2004)
INFO:unoserver:Starting unoserver 3.6.
INFO:unoserver:Command: /usr/bin/soffice --headless --invisible --nocrashreport --nodefault --nologo --nofirststartwizard --norestore -env:UserInstallation=file:///root/.libreoffice_uno_1001/instance_2003 --accept=socket,host=127.0.0.1,port=2004,tcpNoDelay=1;urp;StarOffice.ComponentContext
Exception in thread Thread-1 (serve):
Traceback (most recent call last):
  File "/usr/lib/python3.12/threading.py", line 1073, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.12/threading.py", line 1010, in run
    self._target(*self._args, **self._kwargs)
  File "/opt/venv/lib/python3.12/site-packages/unoserver/server.py", line 133, in serve
    with XMLRPCServer((self.interface, int(self.port)), allow_none=True) as server:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/venv/lib/python3.12/site-packages/unoserver/server.py", line 44, in __init__
    super().__init__(addr=addr_info[0][4], allow_none=allow_none)
  File "/usr/lib/python3.12/xmlrpc/server.py", line 594, in __init__
    socketserver.TCPServer.__init__(self, addr, requestHandler, bind_and_activate)
  File "/usr/lib/python3.12/socketserver.py", line 457, in __init__
    self.server_bind()
  File "/usr/lib/python3.12/socketserver.py", line 473, in server_bind
    self.socket.bind(self.server_address)
OSError: [Errno 98] Address already in use
INFO:unoserver:Failed to start servers

Additional Information

No response

Browsers Affected

No response

No Duplicate of the Issue

• I have verified that there are no existing issues raised related to my problem.

[Frooodle]

Thanks for finding this, will release a hotfix tomorrow morning

[Frooodle]

When you say the slim version does this mean just latest tag or latest-ultra-lite
Edit: sorry just read the dockerfile

[Frooodle]

"it should not be included in the slim image where LibreOffice is absent." applies to latest-ultra-lite not "latest" though, is this user error on your side? I agree that it should fail once and stop though regardless

[ToledoEM]

"it should not be included in the slim image where LibreOffice is absent." applies to latest-ultra-lite not "latest" though, is this user error on your side? I agree that it should fail once and stop though regardless

I might be confusing the versions of the docker images too, but it still apply the error as you said.

EDIT: I rechecked the documentation. You were right, my bad