Bug#1064043: systemd: /etc/fstab x-systemd.automount mount points, x-systemd.idle-timeout changes not effective

[David Sauvage]

Package: systemd
Version: 247.3-7+deb11u4
Severity: normal
X-Debbugs-Cc: david.sauvage at adalabs.com

Dear Maintainer,

Having a successful CFIS remote mount point specification using x-systemd.automount in /etc/fstab, after the first mount when the x-systemd.idle-timeout is changed, and necessary systemd updates run, the old idle timeout value is still the effective one, instead of the newly specified idle timeout value

Given;
- a successful CFIS remote mount point specification using x-systemd.automount in /etc/fstab [0]
- command systemctl daemon-reload executed successfully, and
- command systemctl restart remote-fs.target executed successfully, and
- the resource above has been automatically mounted when needed and unmount after the idle timeout at least one time

When;
- the corresponding resource is currently not mounted
- the x-systemd.idle-timeout parameter is changed (i.e from 900 to 60) in the /etc/fstab, and
- command systemctl daemon-reload executed successfully, and
- command systemctl restart remote-fs.target executed successfully

Then;
- The effective idle timeout is still the old one (i.e 900) instead of the newly specified value (i.e 60)
- The generated file /run/systemd/generator/mnt-resource.mount [3] have the correct updated idle timeout value (i.e 60)
- However, corresponding entries in /proc/mounts [1] and /proc/self/mountinfo [2] contains the old idle timeout value (i.e 900), which is the effective one, and not the newly specified idle timeout value (i.e 60).


[0] /etc/fstab
//W.X.Y.Z/Resource  /mnt/resource  cifs  noauto,x-systemd.automount,x-systemd.idle-timeout=900,credentials=/dir/my-credentials,dir_mode=0755,file_mode=0644,uid=1000,gid=1000 0

[1] /proc/mounts
systemd-1 /mnt/resource autofs rw,relatime,fd=52,pgrp=1,timeout=900,minproto=5,maxproto=5,direct,pipe_ino=13164 0 0

[2] /proc/self/mountinfo
82 26 0:32 / /mnt/resource rw,relatime shared:42 - autofs systemd-1 rw,fd=52,pgrp=1,timeout=900,minproto=5,maxproto=5,direct,pipe_ino=13164

[3] /run/systemd/generator/mnt-resource.mount
# Automatically generated by systemd-fstab-generator

[Unit]
Documentation=man:fstab(5) man:systemd-fstab-generator(8)
SourcePath=/etc/fstab

[Mount]
Where=/mnt/resource
What=//W.X.Y.Z/Resource
Type=cifs
Options=noauto,x-systemd.automount,x-systemd.idle-timeout=60,credentials=/dir/my-credentials,dir_mode=0755,file_mode=0644,uid=1000,gid=1000

-- Package-specific info:

-- System Information:
Debian Release: 11.8
  APT prefers oldstable-updates
  APT policy: (500, 'oldstable-updates'), (500, 'oldstable-security'), (500, 'oldstable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.10.0-26-amd64 (SMP w/1 CPU thread)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages systemd depends on:
ii  adduser          3.118+deb11u1
ii  libacl1          2.2.53-10
ii  libapparmor1     2.13.6-10
ii  libaudit1        1:3.0-2
ii  libblkid1        2.36.1-8+deb11u1
ii  libc6            2.31-13+deb11u7
ii  libcap2          1:2.44-1
ii  libcrypt1        1:4.4.18-4
ii  libcryptsetup12  2:2.3.7-1+deb11u1
ii  libgcrypt20      1.8.7-6
ii  libgnutls30      3.7.1-5+deb11u3
ii  libgpg-error0    1.38-2
ii  libip4tc2        1.8.7-1
ii  libkmod2         28-1
ii  liblz4-1         1.9.3-2
ii  liblzma5         5.2.5-2.1~deb11u1
ii  libmount1        2.36.1-8+deb11u1
ii  libpam0g         1.4.0-9+deb11u1
ii  libseccomp2      2.5.1-1+deb11u1
ii  libselinux1      3.1-3
ii  libsystemd0      247.3-7+deb11u4
ii  libzstd1         1.4.8+dfsg-2.1
ii  mount            2.36.1-8+deb11u1
ii  util-linux       2.36.1-8+deb11u1

Versions of packages systemd recommends:
ii  dbus                             1.12.28-0+deb11u1
ii  systemd-timesyncd [time-daemon]  247.3-7+deb11u4

Versions of packages systemd suggests:
pn  policykit-1        <none>
pn  systemd-container  <none>

Versions of packages systemd is related to:
pn  dracut           <none>
ii  initramfs-tools  0.140
ii  libnss-systemd   247.3-7+deb11u4
ii  libpam-systemd   247.3-7+deb11u4
ii  udev             247.3-7+deb11u4

-- no debconf information