Hi, modules built with gcc-11 14ubuntu1 toolchain have the gcc-11 stable
ibmz PLT patch already reverted to make things work again.

One needs to downgrade gcc-11 to 13ubuntu1 to experience the breakage.

You can fetch older gcc-11 from
https://launchpad.net/ubuntu/+source/gcc-11/11.2.0-13ubuntu1/+build/22629238
and you will most likely also need older binutils from
https://launchpad.net/ubuntu/+source/binutils/2.37-10ubuntu1/+build/22423687

You can pull those debs with:

$ pull-lp-debs --arch s390x binutils jammy 2.37-10ubuntu1
$ pull-lp-debs --arch s390x gcc-11 jammy 11.2.0-13ubuntu1

And downgrade packages that you have already installed to versions one
pulls down with the above commands (i.e. one does not need _all_ of the
packages pulled).

Regards,

Dimitri.

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https://bugs.launchpad.net/bugs/1954676

Title:
  jammy 5.15 kernel soft lockup when zfs.ko is loaded on s390x w/ gcc >=
  11.2.0-10ubuntu1 / gcc-11 PLT regression on s390x

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