Re: scripts/basic/fixdep: /lib64/libc.so.6: version `GLIBC_2.33' not found (required by scripts/basic/fixdep)

[Justin Forbes]

On Tue, Dec 1, 2020 at 7:57 AM Veronika Kabatova <vkabatov(a)redhat.com&gt; wrote:
>  ----- Original Message -----
>  > From: "Sérgio Basto" <sergio(a)serjux.com&gt;
>  > To: "Veronika Kabatova" <vkabatov(a)redhat.com&gt;, "Kernel
> Fedora" <kernel(a)lists.fedoraproject.org&gt;
>  > Sent: Monday, November 30, 2020 3:59:42 PM
>  > Subject: Re: scripts/basic/fixdep: /lib64/libc.so.6: version `GLIBC_2.33' not
> found (required by
>  > scripts/basic/fixdep)
>  >
>  > On Mon, 2020-11-30 at 07:46 -0500, Veronika Kabatova wrote:
>  > >
>  > > ----- Original Message -----
>  > > > From: "Sérgio Basto" <sergio(a)serjux.com&gt;
>  > > > To: "Kernel Fedora" <kernel(a)lists.fedoraproject.org&gt;
>  > > > Sent: Monday, November 23, 2020 12:22:12 AM
>  > > > Subject: scripts/basic/fixdep: /lib64/libc.so.6: version
>  > > > `GLIBC_2.33' not found (required by scripts/basic/fixdep)
>  > > >
>  > > > Hello,
>  > > >
>  > > > with kernels from fedora-rawhide-kernel-nodebug [1]compilation of
>  > > > kmods
>  > > >  started fail because [2]  , how we can fix this issue ?
>  > > >
>  > > >
>  > > > Thanks
>  > > >
>  > > >
>  > > > [1]
>  > > > dnf --enablerepo=fedora-rawhide-kernel-nodebug update
>  > > >
>  > > > [2]
>  > > > scripts/basic/fixdep: /lib64/libc.so.6: version `GLIBC_2.33' not
>  > > > found
>  > > > (required by scripts/basic/fixdep)
>  > > >
>  > >
>  > > Hi,
>  > >
>  > > we're seeing a similar issue with upstream kernels built on rawhide
>  > > for the past ~week.
>  > >
>  > > Specifically in our case we're compiling bpf-next tree (though based
>  > > on the message I'm replying to it doesn't matter). The kernel is then
>  > > installed on Fedora 33 with an attempt to rebuild some modules which
>  > > fails with
>  > >
>  > > /usr/src/kernels/5.10.0-rc3/tools/objtool//fixdep: /lib64/libc.so.6:
>  > > version `GLIBC_2.33' not found (required by
>  > > /usr/src/kernels/5.10.0-rc3/tools/objtool//fixdep)
>  > >
>  > > This is on x86_64.
>  > >
>  > > Did anyone manage to find out what what's causing this? Is it a
>  > > mismatch of versions between rawhide and fc33 that's not expected to
>  > > work? @Sérgio are you also using the kernels with fc33 or purely
>  > > rawhide?
>  > 
A mismatch of modules is definitely expected not to work. Fedora runs
without CONFIG_MODVERSIONS because we do not in any way promise KABI.
Because of this, if you want to run a module, it must be built with
the same compiler/environment that the kernel you wish to insert it
into is built.  If you need out of tree modules, rawhide/nodebug
kernels will need to be run in rawhide, or rebuilt against the version
of Fedora you wish to run it on.

>  > Sometimes when I want test builds of kernel modules (with akmods
> of
>  > RPMFusion), I install kernels from fedora-rawhide-kernel-nodebug
>  > or kernel-stabilization .
>  > I workaround it, by building the kernels that I want to test on copr
>  > [1] for that I download src.rpm from koji .
>  >
>
>  Thanks for the update! Unfortunately building in copr doesn't work
>  for us.
>
>  ccing Don and Justin, have you ever run into this issue with
>  building on rawhide?
>  
I have not seen any issues, though I don't build any out of tree modules either.

Justin