ACK: [SRU][xenial/hwe][PATCH v2 0/1] Fix boot failure on ppc64el (LP: #1922997)

[Tim Gardner]

Acked-by: Tim Gardner <tim.gardner at canonical.com>

On 4/9/21 3:42 AM, Kleber Sacilotto de Souza wrote:
> BugLink: https://bugs.launchpad.net/bugs/1922997
> 
> [Impact]
> Enabling CONFIG_MODVERSIONS on xenial/linux-hwe (via rebase on bionic/linux, see
> bug 1898716) is causing the kernel to fail booting on ppc64el as the modules
> can't be loaded because of the mismatch of the module_layout symbol.
> 
> [ 7.635173] raid0: disagrees about version of symbol module_layout
> 
> [Fix]
> The proposed fix is to disable CONFIG_MODVERSIONS and unset
> CONFIG_SYSTEM_TRUSTED_KEYS via the 'local-mangle' script which gets called by
> the 'open' script after the rebase. Making the changes directly on the config or
> annotations file is not persistent as these files are synced from master.
> 
> This is a temporary fix until the root cause can be found.
> 
> [Test case]
> Boot the kernel on a xenial ppc64el system.
> 
> [Regression potential]
> This config option has been enabled on Bionic to support rebuilding the lrm
> modules without the need to rebuild the kernel. There are no lrm modules in
> Xenial, so it should be safe to keep it disabled.
> 
> Kleber Sacilotto de Souza (1):
>    UBUNTU: [Packaging] HWE: disable CONFIG_MODVERSIONS
> 
>   debian.hwe/scripts/helpers/local-mangle | 9 +++++++++
>   1 file changed, 9 insertions(+)
> 
> ---
> v2:
>    - Also unset CONFIG_SYSTEM_TRUSTED_KEYS
>    - Rework the sed regex'es to be less prolix and more robust
> 

-- 
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Tim Gardner
Canonical, Inc