Bug#991406: systemd: proc: unrecognized mount option "hidepid=invisible" or missing value

[Thomas Uhle]

On Fri, 23 Jul 2021, Michael Biebl wrote:


On Thu, 22 Jul 2021 21:09:33 +0200 Thomas Uhle 
 wrote:

> Do you know whether this has already been fixed in a newer systemd version
> or whether this has already been dealt with upstream? I could not find
> anything with respect to this issue

There is https://github.com/systemd/systemd/issues/16896


It was closed wontfix.



Thanks a lot for the hint!

I had a look at the explanation and the corresponding commit, and I 
understand that it is not possible to have support on a per-mount basis 
for the ProtectProc setting if the running Linux kernel is older than 
version 5.8. But I have also learned that the old behaviour of systemd 
(before version 245) can be retained at least just by replacing 
"ProtectProc=invisible" with "ProtectProc=default" in the systemd service 
units in question (after copying these files to /etc/systemd/system/ of 
course). Then systemd does not try to mount /proc with option 
"hidepid=invisible" and, thus, there is also no error message in syslog 
any longer.


Best regards,

Thomas Uhle

Bug#991406: systemd: proc: unrecognized mount option "hidepid=invisible" or missing value

[Michael Biebl]

On Thu, 22 Jul 2021 21:09:33 +0200 Thomas Uhle
 wrote:

> Do you know whether this has already been fixed in a newer systemd version
> or whether this has already been dealt with upstream? I could not find 
> anything with respect to this issue

There is https://github.com/systemd/systemd/issues/16896


It was closed wontfix.


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Bug#991406: systemd: proc: unrecognized mount option "hidepid=invisible" or missing value

[Thomas Uhle]

Package: systemd
Version: 247.3-6
Severity: important

Dear maintainers,

after upgrading from buster to bullseye, I see the following error message 
in syslog multiple times (timestamp and host name stripped):


kernel: proc: unrecognized mount option "hidepid=invisible" or missing value

In some forum posts, it has been stated that it is due to 
/lib/systemd/systemd-remount-fs which seems to require a pretty recent 
Linux kernel like version 5.10 in bullseye. So everyone with a legacy 
kernel will get this error message in syslog several times because older 
kernels require a numerical value such as "hidepid=1" or "hidepid=2" 
instead of "hidepid=invisible".
Do you know whether this has already been fixed in a newer systemd version 
or whether this has already been dealt with upstream? I could not find 
anything with respect to this issue but I guess it should not be hard for 
a systemd developer to change systemd-remount-fs' behaviour depending on 
the running kernel version.

It really would be great if this could be fixed.

Thank you in advance!

Thomas Uhle


-- System Information:
Debian Release: 11.0
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'testing'), (500, 'stable')
Architecture: arm64 (aarch64)
Foreign Architectures: armhf

Kernel: Linux 3.16.85-odroidc2 (SMP w/4 CPU threads; PREEMPT)
Kernel taint flags: TAINT_OOT_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), 
LANGUAGE=en_US.UTF-8

Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages systemd depends on:
ii  adduser  3.118
ii  libacl1  2.2.53-10
ii  libapparmor1 2.13.6-10
ii  libaudit11:3.0-2
ii  libblkid12.36.1-7
ii  libc62.31-12
ii  libcap2  1:2.44-1
ii  libcrypt11:4.4.18-4
ii  libcryptsetup12  2:2.3.5-1
ii  libgcrypt20  1.8.7-6
ii  libgnutls30  3.7.1-5
ii  libgpg-error01.38-2
ii  libip4tc21.8.7-1
ii  libkmod2 28-1
ii  liblz4-1 1.9.3-2
ii  liblzma5 5.2.5-2
ii  libmount12.36.1-7
ii  libpam0g 1.4.0-9
ii  libseccomp2  2.5.1-1
ii  libselinux1  3.1-3
ii  libsystemd0  247.3-6
ii  libzstd1 1.4.8+dfsg-2.1
ii  mount2.36.1-7
ii  systemd-timesyncd [time-daemon]  247.3-6
ii  util-linux   2.36.1-7

Versions of packages systemd recommends:
ii  dbus  1.12.20-2

Versions of packages systemd suggests:
ii  policykit-10.105-31
pn  systemd-container  

Versions of packages systemd is related to:
pn  dracut   
ii  initramfs-tools  0.140
ii  libnss-systemd   247.3-6
ii  libpam-systemd   247.3-6
ii  udev 247.3-6