[BUG] universal-calibre mod fails to set file permissions in calibre-web container

[vonmillhausen]

Is there an existing issue for this?

• I have searched the existing issues

Name of mod

universal-calibre

Name of base container

lscr.io/linuxserver/calibre-web:latest

Current Behavior

Startup log indicates tar command fails to set mod layer file permissions with Bad address error, leaving the mod files in the container with only rwx------ permissions for root root.

Expected Behavior

The mod layer should install correctly with the correct file permissions (rwxr-xr-x).

Steps To Reproduce

1. Use the stock docker-compose script from https://hub.docker.com/r/linuxserver/calibre-web#docker-compose-recommended-click-here-for-more-info
2. Check the logs from the Docker container on startup, seeing the error messages from tar about setting file permissions (specifically, one block of error messages after [mod-init] Installing linuxserver/mods:universal-calibre, and another block after Processing triggers for libc-bin (2.39-0ubuntu8.6) ...)

Environment

- OS: QNAP NAS running kernel 5.10.60-qnap
- How docker service was installed: stock Docker install included in latest QNAP firmware; `calibre-web` container created via Portainer, not Container Station

CPU architecture

x86-64

Docker creation

services:
  calibre-web:
    image: lscr.io/linuxserver/calibre-web:latest
    container_name: calibre-web
    environment:
      - PUID=1000
      - PGID=1000
      - TZ=Etc/UTC
      - DOCKER_MODS=linuxserver/mods:universal-calibre #optional
      - OAUTHLIB_RELAX_TOKEN_SCOPE=1 #optional
    volumes:
      - /share/Container/calibre-web/data:/config
      - /share/Media/ebooks:/books
    ports:
      - 8083:8083
    restart: unless-stopped

Container logs

[mod-init] Running Docker Modification Logic
[mod-init] Adding linuxserver/mods:universal-calibre to container
[mod-init] Downloading linuxserver/mods:universal-calibre from lscr.io
[mod-init] Installing linuxserver/mods:universal-calibre
tar: etc/s6-overlay/s6-rc.d/init-mod-universal-calibre-add-package/dependencies.d: Cannot change mode to rwxr-xr-x: Bad address
tar: etc/s6-overlay/s6-rc.d/init-mod-universal-calibre-add-package: Cannot change mode to rwxr-xr-x: Bad address
tar: etc/s6-overlay/s6-rc.d/init-mod-universal-calibre-setup/dependencies.d: Cannot change mode to rwxr-xr-x: Bad address
tar: etc/s6-overlay/s6-rc.d/init-mod-universal-calibre-setup: Cannot change mode to rwxr-xr-x: Bad address
tar: etc/s6-overlay/s6-rc.d/init-mods-end/dependencies.d: Cannot change mode to rwxr-xr-x: Bad address
tar: etc/s6-overlay/s6-rc.d/init-mods-end: Cannot change mode to rwxr-xr-x: Bad address
tar: etc/s6-overlay/s6-rc.d/init-mods-package-install/dependencies.d: Cannot change mode to rwxr-xr-x: Bad address
tar: etc/s6-overlay/s6-rc.d/init-mods-package-install: Cannot change mode to rwxr-xr-x: Bad address
tar: etc/s6-overlay/s6-rc.d/user/contents.d: Cannot change mode to rwxr-xr-x: Bad address
tar: etc/s6-overlay/s6-rc.d/user: Cannot change mode to rwxr-xr-x: Bad address
tar: etc/s6-overlay/s6-rc.d: Cannot change mode to rwxr-xr-x: Bad address
tar: etc/s6-overlay: Cannot change mode to rwxr-xr-x: Bad address
tar: etc: Cannot change mode to rwxr-xr-x: Bad address
tar: Exiting with failure status due to previous errors
[mod-init] linuxserver/mods:universal-calibre applied to container
[migrations] started
[migrations] no migrations found
───────────────────────────────────────
      ██╗     ███████╗██╗ ██████╗
      ██║     ██╔════╝██║██╔═══██╗
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      ███████╗███████║██║╚██████╔╝
      ╚══════╝╚══════╝╚═╝ ╚═════╝
   Brought to you by linuxserver.io
───────────────────────────────────────
To support the app dev(s) visit:
Calibre-Web: https://paypal.me/calibreweb
To support LSIO projects visit:
https://www.linuxserver.io/donate/
───────────────────────────────────────
GID/UID
───────────────────────────────────────
User UID:    1000
User GID:    1000
───────────────────────────────────────
**** Adding calibre dependencies to package install list ****
[pkg-install-init] **** Installing all mod packages ****
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Reading package lists...
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Building dependency tree...
Reading state information...
The following additional packages will be installed:
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  libelf1t64 libgbm1 libgl1-mesa-dri libglvnd0 libglx0 libllvm20 libnspr4
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  libxshmfence1 libxxf86vm1 mesa-libgallium xkb-data
Suggested packages:
  pciutils lm-sensors
Recommended packages:
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The following NEW packages will be installed:
  libdrm-amdgpu1 libdrm-common libdrm-intel1 libdrm2 libedit2 libegl-mesa0
  libegl1 libelf1t64 libgbm1 libgl1 libgl1-mesa-dri libglvnd0 libglx-mesa0
  libglx0 libllvm20 libnspr4 libnss3 libopengl0 libpciaccess0
  libsensors-config libsensors5 libvulkan1 libwayland-client0
  libwayland-server0 libx11-xcb1 libxcb-dri3-0 libxcb-glx0 libxcb-present0
  libxcb-randr0 libxcb-shm0 libxcb-sync1 libxcb-xfixes0 libxcomposite1
  libxdamage1 libxkbcommon0 libxkbfile1 libxrandr2 libxrender1 libxshmfence1
  libxtst6 libxxf86vm1 mesa-libgallium xkb-data xz-utils
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Unpacking libxtst6:amd64 (2:1.2.3-1.1build1) ...
Selecting previously unselected package libglvnd0:amd64.
Preparing to unpack .../39-libglvnd0_1.7.0-1build1_amd64.deb ...
Unpacking libglvnd0:amd64 (1.7.0-1build1) ...
Selecting previously unselected package libegl1:amd64.
Preparing to unpack .../40-libegl1_1.7.0-1build1_amd64.deb ...
Unpacking libegl1:amd64 (1.7.0-1build1) ...
Selecting previously unselected package libglx0:amd64.
Preparing to unpack .../41-libglx0_1.7.0-1build1_amd64.deb ...
Unpacking libglx0:amd64 (1.7.0-1build1) ...
Selecting previously unselected package libgl1:amd64.
Preparing to unpack .../42-libgl1_1.7.0-1build1_amd64.deb ...
Unpacking libgl1:amd64 (1.7.0-1build1) ...
Selecting previously unselected package libopengl0:amd64.
Preparing to unpack .../43-libopengl0_1.7.0-1build1_amd64.deb ...
Unpacking libopengl0:amd64 (1.7.0-1build1) ...
Setting up libxcb-dri3-0:amd64 (1.15-1ubuntu2) ...
Setting up libwayland-server0:amd64 (1.22.0-2.1build1) ...
Setting up libx11-xcb1:amd64 (2:1.8.7-1build1) ...
Setting up libpciaccess0:amd64 (0.17-3ubuntu0.24.04.2) ...
Setting up libxdamage1:amd64 (1:1.1.6-1build1) ...
Setting up libxcb-xfixes0:amd64 (1.15-1ubuntu2) ...
Setting up libxrender1:amd64 (1:0.9.10-1.1build1) ...
Setting up libglvnd0:amd64 (1.7.0-1build1) ...
Setting up libxtst6:amd64 (2:1.2.3-1.1build1) ...
Setting up libxcb-glx0:amd64 (1.15-1ubuntu2) ...
Setting up libedit2:amd64 (3.1-20230828-1build1) ...
Setting up libsensors-config (1:3.6.0-9build1) ...
Setting up xkb-data (2.41-2ubuntu1.1) ...
Setting up libxcb-shm0:amd64 (1.15-1ubuntu2) ...
Setting up libopengl0:amd64 (1.7.0-1build1) ...
Setting up libelf1t64:amd64 (0.190-1.1ubuntu0.1) ...
Setting up libxxf86vm1:amd64 (1:1.1.4-1build4) ...
Setting up libxcb-present0:amd64 (1.15-1ubuntu2) ...
Setting up libnspr4:amd64 (2:4.35-1.1build1) ...
Setting up libxcb-sync1:amd64 (1.15-1ubuntu2) ...
Setting up xz-utils (5.6.1+really5.4.5-1ubuntu0.2) ...
update-alternatives: using /usr/bin/xz to provide /usr/bin/lzma (lzma) in auto mode
update-alternatives: warning: skip creation of /usr/share/man/man1/lzma.1.gz because associated file /usr/share/man/man1/xz.1.gz (of link group lzma) doesn't exist
update-alternatives: warning: skip creation of /usr/share/man/man1/unlzma.1.gz because associated file /usr/share/man/man1/unxz.1.gz (of link group lzma) doesn't exist
update-alternatives: warning: skip creation of /usr/share/man/man1/lzcat.1.gz because associated file /usr/share/man/man1/xzcat.1.gz (of link group lzma) doesn't exist
update-alternatives: warning: skip creation of /usr/share/man/man1/lzmore.1.gz because associated file /usr/share/man/man1/xzmore.1.gz (of link group lzma) doesn't exist
update-alternatives: warning: skip creation of /usr/share/man/man1/lzless.1.gz because associated file /usr/share/man/man1/xzless.1.gz (of link group lzma) doesn't exist
update-alternatives: warning: skip creation of /usr/share/man/man1/lzdiff.1.gz because associated file /usr/share/man/man1/xzdiff.1.gz (of link group lzma) doesn't exist
update-alternatives: warning: skip creation of /usr/share/man/man1/lzcmp.1.gz because associated file /usr/share/man/man1/xzcmp.1.gz (of link group lzma) doesn't exist
update-alternatives: warning: skip creation of /usr/share/man/man1/lzgrep.1.gz because associated file /usr/share/man/man1/xzgrep.1.gz (of link group lzma) doesn't exist
update-alternatives: warning: skip creation of /usr/share/man/man1/lzegrep.1.gz because associated file /usr/share/man/man1/xzegrep.1.gz (of link group lzma) doesn't exist
update-alternatives: warning: skip creation of /usr/share/man/man1/lzfgrep.1.gz because associated file /usr/share/man/man1/xzfgrep.1.gz (of link group lzma) doesn't exist
Setting up libxrandr2:amd64 (2:1.5.2-2build1) ...
Setting up libllvm20:amd64 (1:20.1.2-0ubuntu1~24.04.2) ...
Setting up libsensors5:amd64 (1:3.6.0-9build1) ...
Setting up libvulkan1:amd64 (1.3.275.0-1build1) ...
Setting up libxshmfence1:amd64 (1.3-1build5) ...
Setting up libxcb-randr0:amd64 (1.15-1ubuntu2) ...
Setting up libxkbfile1:amd64 (1:1.1.0-1build4) ...
Setting up libdrm-common (2.4.122-1~ubuntu0.24.04.2) ...
Setting up libxcomposite1:amd64 (1:0.4.5-1build3) ...
Setting up libxkbcommon0:amd64 (1.6.0-1build1) ...
Setting up libwayland-client0:amd64 (1.22.0-2.1build1) ...
Setting up libnss3:amd64 (2:3.98-1build1) ...
Setting up libdrm2:amd64 (2.4.122-1~ubuntu0.24.04.2) ...
Setting up libdrm-amdgpu1:amd64 (2.4.122-1~ubuntu0.24.04.2) ...
Setting up libdrm-intel1:amd64 (2.4.122-1~ubuntu0.24.04.2) ...
Setting up mesa-libgallium:amd64 (25.0.7-0ubuntu0.24.04.2) ...
Setting up libgbm1:amd64 (25.0.7-0ubuntu0.24.04.2) ...
Setting up libgl1-mesa-dri:amd64 (25.0.7-0ubuntu0.24.04.2) ...
Setting up libegl-mesa0:amd64 (25.0.7-0ubuntu0.24.04.2) ...
Setting up libegl1:amd64 (1.7.0-1build1) ...
Setting up libglx-mesa0:amd64 (25.0.7-0ubuntu0.24.04.2) ...
Setting up libglx0:amd64 (1.7.0-1build1) ...
Setting up libgl1:amd64 (1.7.0-1build1) ...
Processing triggers for libc-bin (2.39-0ubuntu8.6) ...
tar: resources/catalog: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/content-server: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/dictionaries/en-GB: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/dictionaries/en-US: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/dictionaries/es-ES: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/dictionaries: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/editor-help: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/fonts/liberation: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/fonts: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/hyphenation: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/images/devices: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/images/mimetypes: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/images/plugins: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/images/textures: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/images: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/jacket: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/localization: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/mathjax/input/mml: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/mathjax/input: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/mathjax/output/chtml/fonts/woff-v2: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/mathjax/output/chtml/fonts: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/mathjax/output/chtml: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/mathjax/output: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/mathjax: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/quick_start: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/rapydscript: Cannot change mode to rwxr-xr-x: Bad address
tar: resources/templates: Cannot change mode to rwxr-xr-x: Bad address
tar: resources: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/aav: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/art: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/azc: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/bat: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/bnt: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/ccs: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/cel: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/cus: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/dra: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/esx: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/gmq: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/gmw: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/grk: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/inc: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/ine: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/ira: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/iro: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/itc: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/jpx: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/map: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/miz: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/myn: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/poz: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/roa: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/sai: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/sem: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/sit: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/tai: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/trk: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/urj: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/xgn: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/zle: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/zls: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang/zlw: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/lang: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/voices/!v: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data/voices: Cannot change mode to rwxr-xr-x: Bad address
tar: share/espeak-ng-data: Cannot change mode to rwxr-xr-x: Bad address
tar: share: Cannot change mode to rwxr-xr-x: Bad address
tar: lib/calibre-extensions: Cannot change mode to rwxr-xr-x: Bad address
tar: lib/ossl-modules: Cannot change mode to rwxr-xr-x: Bad address
tar: lib: Cannot change mode to rwxr-xr-x: Bad address
tar: libexec: Cannot change mode to rwxr-xr-x: Bad address
tar: bin: Cannot change mode to rwxr-xr-x: Bad address
tar: translations/qtwebengine_locales: Cannot change mode to rwxr-xr-x: Bad address
tar: translations: Cannot change mode to rwxr-xr-x: Bad address
tar: plugins/egldeviceintegrations: Cannot change mode to rwxr-xr-x: Bad address
tar: plugins/iconengines: Cannot change mode to rwxr-xr-x: Bad address
tar: plugins/imageformats: Cannot change mode to rwxr-xr-x: Bad address
tar: plugins/multimedia: Cannot change mode to rwxr-xr-x: Bad address
tar: plugins/platforminputcontexts: Cannot change mode to rwxr-xr-x: Bad address
tar: plugins/platforms: Cannot change mode to rwxr-xr-x: Bad address
tar: plugins/platformthemes: Cannot change mode to rwxr-xr-x: Bad address
tar: plugins/sqldrivers: Cannot change mode to rwxr-xr-x: Bad address
tar: plugins/texttospeech: Cannot change mode to rwxr-xr-x: Bad address
tar: plugins/tls: Cannot change mode to rwxr-xr-x: Bad address
tar: plugins/wayland-decoration-client: Cannot change mode to rwxr-xr-x: Bad address
tar: plugins/wayland-graphics-integration-client: Cannot change mode to rwxr-xr-x: Bad address
tar: plugins/wayland-shell-integration: Cannot change mode to rwxr-xr-x: Bad address
tar: plugins/xcbglintegrations: Cannot change mode to rwxr-xr-x: Bad address
tar: plugins: Cannot change mode to rwxr-xr-x: Bad address
tar: Exiting with failure status due to previous errors
Installing Calibre version v8.16.2
xdg-desktop-menu: No writable system menu directory found.
Creating symlinks...
	Symlinking /app/calibre/ebook-device to /usr/bin/ebook-device
	Symlinking /app/calibre/ebook-meta to /usr/bin/ebook-meta
	Symlinking /app/calibre/ebook-convert to /usr/bin/ebook-convert
	Symlinking /app/calibre/ebook-polish to /usr/bin/ebook-polish
	Symlinking /app/calibre/markdown-calibre to /usr/bin/markdown-calibre
	Symlinking /app/calibre/web2disk to /usr/bin/web2disk
	Symlinking /app/calibre/calibre-server to /usr/bin/calibre-server
	Symlinking /app/calibre/lrf2lrs to /usr/bin/lrf2lrs
	Symlinking /app/calibre/lrs2lrf to /usr/bin/lrs2lrf
	Symlinking /app/calibre/calibre-debug to /usr/bin/calibre-debug
	Symlinking /app/calibre/calibredb to /usr/bin/calibredb
	Symlinking /app/calibre/calibre-parallel to /usr/bin/calibre-parallel
	Symlinking /app/calibre/calibre-customize to /usr/bin/calibre-customize
	Symlinking /app/calibre/fetch-ebook-metadata to /usr/bin/fetch-ebook-metadata
	Symlinking /app/calibre/calibre-smtp to /usr/bin/calibre-smtp
	Symlinking /app/calibre/calibre to /usr/bin/calibre
	Symlinking /app/calibre/lrfviewer to /usr/bin/lrfviewer
	Symlinking /app/calibre/ebook-viewer to /usr/bin/ebook-viewer
	Symlinking /app/calibre/ebook-edit to /usr/bin/ebook-edit
Setting up command-line completion...
Installing zsh completion to: /usr/share/zsh/vendor-completions/_calibre
Failed to find directory to install bash completions, using default.
Installing bash completion to: /usr/share/bash-completion/completions/
Setting up desktop integration...
____________________ WARNING ____________________
Setting up desktop integration failed with error:
__________________________________________________
	Traceback (most recent call last):
	  File "calibre/linux.py", line 858, in setup_desktop_integration
	  File "calibre/linux.py", line 880, in do_setup_desktop_integration
	  File "calibre/linux.py", line 960, in install_xdg_junk
	  File "subprocess.py", line 413, in check_call
	subprocess.CalledProcessError: Command 'xdg-desktop-menu install --noupdate ./calibre-gui.desktop' returned non-zero exit status 3.
Creating un-installer: /usr/bin/calibre-uninstall
There were 1 warnings
* Setting up desktop integration failed with error:
**** The 2 warnings above about setting up completion and desktop integration are expected and harmless. You can safely ignore them. ****
[custom-init] No custom files found, skipping...
[2026-01-03 01:46:26,012]  WARN {warnings.py:110} /lsiopy/lib/python3.12/site-packages/pycountry/__init__.py:10: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.
  import pkg_resources
Connection to localhost (::1) 8083 port [tcp/*] succeeded!
[ls.io-init] done.

[Roxedus]

This is a QNAP kernel issue. https://www.qnap.com/en/how-to/faq/article/why-do-certain-images-encounter-permission-errors-when-executing-commands-in-lxd-or-docker
Also discussed in linuxserver/docker-swag#514 (comment)

[vonmillhausen]

Thanks @Roxedus! I didn't come across that in all of my troubleshooting yesterday. Given that this seems to be an upstream QNAP issue, I'm happy enough for this issue to be closed if you think that's appropriate... but adding a note to the Application Setup section of the Docker Hub page (https://hub.docker.com/r/linuxserver/calibre-web#application-setup) to say there's an issue with certain QNAP firmwares leading to a Calibre binaries not viable error message from the calibre-web UI when trying to save /usr/bin in the Settings > Basic Configuration > External Binaries > Path to Calibre Binaries field might help other folks avoid a lot of head-scratching and troubleshooting until such time as either QNAP fixes their kernel, or some other solution is found (e.g., just integrating the binaries into the calibre-web Docker base image and leaving the feature turned off by default for folks that don't want to or can't use it due to architecture).

Thanks!

[Roxedus]

This affects most updated images

[vonmillhausen]

For anyone else who's running into this before QNAP pushes out a fix (if they do), you can temporarily fix this issue by opening a Bash shell inside the Docker container as root once its up-and-running, and then running the following script (just put it somewhere you can access from inside the container, and make sure to set it as executable - I used the host folder where /books was mapped):

#!/usr/bin/env bash

chmod 755 /app/calibre/bin
chmod 755 /app/calibre/lib
chmod -R 755 /app/calibre/lib/calibre-extensions
chmod 755 /app/calibre/lib/ossl-modules
chmod 755 /app/calibre/libexec
chmod -R 755 /app/calibre/plugins
chmod 755 /app/calibre/resources
chmod 755 /app/calibre/resources/catalog
chmod 755 /app/calibre/resources/content-server
chmod 755 /app/calibre/resources/dictionaries
chmod 755 /app/calibre/resources/dictionaries/en-GB
chmod 755 /app/calibre/resources/dictionaries/en-US
chmod 755 /app/calibre/resources/dictionaries/es-ES
chmod 755 /app/calibre/resources/editor-help
chmod 755 /app/calibre/resources/fonts
chmod 755 /app/calibre/resources/fonts/liberation
chmod 755 /app/calibre/resources/hyphenation
chmod 755 /app/calibre/resources/images
chmod 755 /app/calibre/resources/images/devices
chmod 755 /app/calibre/resources/images/mimetypes
chmod 755 /app/calibre/resources/images/plugins
chmod 755 /app/calibre/resources/images/textures
chmod 755 /app/calibre/resources/jacket
chmod 755 /app/calibre/resources/locales
chmod 755 /app/calibre/resources/localization
chmod 755 /app/calibre/resources/mathjax
chmod 755 /app/calibre/resources/mathjax/input
chmod 755 /app/calibre/resources/mathjax/input/mml
chmod 755 /app/calibre/resources/mathjax/output
chmod 755 /app/calibre/resources/mathjax/output/chtml
chmod 755 /app/calibre/resources/mathjax/output/chtml/fonts
chmod 755 /app/calibre/resources/mathjax/output/chtml/fonts/woff-v2
chmod 755 /app/calibre/resources/mathjax/output/chtml/fonts/woff-v2/
chmod 755 /app/calibre/resources/quick_start
chmod 755 /app/calibre/resources/rapydscript
chmod 755 /app/calibre/resources/templates
chmod 755 /app/calibre/share
chmod 755 /app/calibre/share/espeak-ng-data
chmod 755 /app/calibre/share/espeak-ng-data/lang
chmod 755 /app/calibre/share/espeak-ng-data/lang/aav
chmod 755 /app/calibre/share/espeak-ng-data/lang/art
chmod 755 /app/calibre/share/espeak-ng-data/lang/azc
chmod 755 /app/calibre/share/espeak-ng-data/lang/bat
chmod 755 /app/calibre/share/espeak-ng-data/lang/bnt
chmod 755 /app/calibre/share/espeak-ng-data/lang/ccs
chmod 755 /app/calibre/share/espeak-ng-data/lang/cel
chmod 755 /app/calibre/share/espeak-ng-data/lang/cus
chmod 755 /app/calibre/share/espeak-ng-data/lang/dra
chmod 755 /app/calibre/share/espeak-ng-data/lang/esx
chmod 755 /app/calibre/share/espeak-ng-data/lang/gmq
chmod 755 /app/calibre/share/espeak-ng-data/lang/gmw
chmod 755 /app/calibre/share/espeak-ng-data/lang/grk
chmod 755 /app/calibre/share/espeak-ng-data/lang/inc
chmod 755 /app/calibre/share/espeak-ng-data/lang/ine
chmod 755 /app/calibre/share/espeak-ng-data/lang/ira
chmod 755 /app/calibre/share/espeak-ng-data/lang/iro
chmod 755 /app/calibre/share/espeak-ng-data/lang/itc
chmod 755 /app/calibre/share/espeak-ng-data/lang/jpx
chmod 755 /app/calibre/share/espeak-ng-data/lang/map
chmod 755 /app/calibre/share/espeak-ng-data/lang/miz
chmod 755 /app/calibre/share/espeak-ng-data/lang/myn
chmod 755 /app/calibre/share/espeak-ng-data/lang/poz
chmod 755 /app/calibre/share/espeak-ng-data/lang/roa
chmod 755 /app/calibre/share/espeak-ng-data/lang/sai
chmod 755 /app/calibre/share/espeak-ng-data/lang/sem
chmod 755 /app/calibre/share/espeak-ng-data/lang/sit
chmod 755 /app/calibre/share/espeak-ng-data/lang/tai
chmod 755 /app/calibre/share/espeak-ng-data/lang/trk
chmod 755 /app/calibre/share/espeak-ng-data/lang/urj
chmod 755 /app/calibre/share/espeak-ng-data/lang/xgn
chmod 755 /app/calibre/share/espeak-ng-data/lang/zle
chmod 755 /app/calibre/share/espeak-ng-data/lang/zls
chmod 755 /app/calibre/share/espeak-ng-data/lang/zlw
chmod 755 /app/calibre/share/espeak-ng-data/voices
chmod 755 /app/calibre/share/espeak-ng-data/voices/\!v
chmod 755 /app/calibre/translations
chmod 755 /app/calibre/translations/qtwebengine_locales

It just sets the same permissions on the required folders and files that tar fails to do automatically. Afterwards you should be able to set Settings > Basic Configuration > External Binaries > Path to Calibre Binaries to /usr/bin successfully as-per the container documentation. It worked for me, I hope it's useful to someone else.