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About kernel names and probably newer kernels

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mabra
Posts: 110
Joined: 2010-10-16 16:53

About kernel names and probably newer kernels

#1 Post by mabra »

Hi All!
With some computers I stuck on debian buster (and usually there with kernel 5.10.0-0.deb10.16-amd64).
I run zfs on root and tried to use overlayfs, which fails (works on my bullseye, 6.1.0-0.deb11.5-amd64).
I am trying to find out whats the reason, which, originally, was a ZFS bug.
So I looked for a newer kernel/zfs-version for buster and stumpled over the kernel names,
which I cannot interpret .... this is "unsigned"

Code: Select all

linux-image-5.10.0-0.deb10.20-amd64-dbg - Debug symbols for linux-image-5.10.0-0.deb10.20-amd64
linux-image-5.10.0-0.deb10.20-amd64 - Linux 5.10 for 64-bit PCs (signed)
linux-image-5.10.0-0.deb10.20-amd64-unsigned - Linux 5.10 for 64-bit PCs
But to upgrade, I would have to decide to ....deb10.20-amd64 plus ....deb10.20-amd64-dbg.
because I need the "*-dbg" version, because I run systemtap.
Thats one part.
The other would be, how to get probably kernel 5.11(!) which is mentioned to have
some changes, if it comes to overlayfs, may be this would help.
I want to avoid to install zfs from testing.
Any tip will be really welcome!

Regards,
Manfred

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Re: About kernel names and probably newer kernels

#2 Post by lindi »

Unsigned refers to the binary package that has not been signed for use with secure boot. Without additional setup systemtap is incompatible with secure boot anyway so you might as well use it if you want.

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mabra
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Re: About kernel names and probably newer kernels

#3 Post by mabra »

Ok, thank you.
So "unsigned" is that, what was the kernel before secure boot.
Indeed Systemtap is always something special - my last attemot
to make it running failed.

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Re: About kernel names and probably newer kernels

#4 Post by lindi »

I happen to maintain the systemtap package occasionally. You need to describe exactly what commands you ran and how they failed, it is pretty impossible to guess the problem otherwise. It is likely that buster's systemtap is not going to work with a non-buster kernel.

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Re: About kernel names and probably newer kernels

#5 Post by stevepusser »

Debian style kernels actually have two different versions at once. Run "uname -a" in a terminal to see the full kernel version with both.

Zfs has a dkms kernel module that needs to be compatible with a newer kernel to build. I don't think anyone has backported zfs for buster backports like they have for bullseye-backports https://packages.debian.org/bullseye-backports/zfs-dkms

but I could try if asked nicely.
MX Linux packager and developer

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mabra
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Re: About kernel names and probably newer kernels

#6 Post by mabra »

Hi!
Thanks for your reply.
lindi wrote: 2023-04-19 06:47 I happen to maintain the systemtap package occasionally. You need to describe exactly what commands you ran and how they failed, it is pretty impossible to guess the problem otherwise. It is likely that buster's systemtap is not going to work with a non-buster kernel.
This was not a systemtap question, just to see, what other kernel I can install.
To systemtap, this will become timeconsuming, it's a pain to setup all over the
time ("stap-prep" claims "debian ...."), like xtables-addons :lol:
My short mention was, because their "original" "Hello world" bombs.
It probably has also to follow kernel changes and this is out of my
knowledge, need something simpler. My scripts, stolen in the internet
and modified (for example, watching DNS), worked on buster until
I installed kernel 6 (which brought other issues probably too).
I removed it.
Regards,
Manfred

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mabra
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Re: About kernel names and probably newer kernels

#7 Post by mabra »

Hello!
Thanks for your reply.
stevepusser wrote: 2023-04-21 19:45 Zfs has a dkms kernel module that needs to be compatible with a newer kernel to build. I don't think anyone has backported zfs for buster backports like they have for bullseye-backports https://packages.debian.org/bullseye-backports/zfs-dkms

but I could try if asked nicely.
I verify always, which version fits and had never a problem with it.
A pro po backports, what does my buster tell me?
$ apt-cache policy zfs-dkms
zfs-dkms:
  Installed: 2.0.3-9~bpo10+1
  Candidate: 2.0.3-9~bpo10+1
  Version table:
     2.1.9-3 -1
         -1 http://deb.debian.org/debian testing/contrib amd64 Packages
 *** 2.0.3-9~bpo10+1 990
        100 http://httpredir.debian.org/debian buster-backports/contrib amd64 Packages
        100 /var/lib/dpkg/status
     0.7.12-2+deb10u2 500
        500 http://deb.debian.org/debian buster/contrib amd64 Packages
Good working backport!
Had to verify this shortly, because of the overlayfs-bug in ZFS and could
not find, which version fixed it finally.
Now I know, by testing, it's not the 2.0.3 (above), but at least the 2.1.9 on
my bullseye workstation.
BTW, have ZFS on my samba-server since its appearence in
Debian, so about 2012, with wheezy. Best decision all the time.
Learned it about 20 years ago on Windows: What would be
a computer with snapshots?
Regards,
Manfred

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Re: About kernel names and probably newer kernels

#8 Post by stevepusser »

Code: Select all

     2.1.9-3 -1
         -1 http://deb.debian.org/debian testing/contrib amd64 Packages
 *** 2.0.3-9~bpo10+1 990
        100 http://httpredir.debian.org/debian buster-backports/contrib amd64 Packages
        100 /var/lib/dpkg/status
     0.7.12-2+deb10u2 500
        500 http://deb.debian.org/debian buster/contrib amd64 Packages
I just hope you are very careful with what you may install from Debian testing or stable onto Buster (oldstable), because that's often a path to a broken Debian.
MX Linux packager and developer

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mabra
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Re: About kernel names and probably newer kernels

#9 Post by mabra »

Hi!
I share your hope :?
I use a preferences file, so nothing will come automagically.
Just installed xtables-dkms-addon, because all other versions break
(for me since years ....).
Have ZFS on root and can just revert to the "last known good".
-Manfred

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