PROBLEM: UBSAN enabled in 5.14 and 5.13.14 kernels leads to kernel crash

[Andrew Moes]

Hi Paolo,

Sorry for the delay. I disabled UBSAN for all my builds as it's just not sustainable to hunt for issues in hundreds of possible modules and HW configurations.

Having that said, I can certainly test your patch and it would be easier for me if you can provide the link (or a patch file) to it so I can rebuild the kernel for my environment and re-test.

--Andrew

________________________________
From: Paolo Pisati <paolo.pisati at canonical.com>
Sent: Wednesday, September 8, 2021 5:29 AM
To: Andrew Moes <mail at andrii.me>
Cc: kernel-team at lists.ubuntu.com <kernel-team at lists.ubuntu.com>
Subject: Re: PROBLEM: UBSAN enabled in 5.14 and 5.13.14 kernels leads to kernel crash

On Sat, Sep 04, 2021 at 08:20:31PM +0000, Andrew Moes wrote:
>    Hi,
>
>    Problematic
>    change: [1]https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.ubuntu.com%2Farchives%2Fkernel-team%2F2021-August%2F12&data=04%7C01%7C%7C5454f3d9dadf45fc584708d972ab3bdf%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637666902032503492%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=VajNgVAlQ3Elgbi1aVeKNw7NsTdxe1NzHmZZd%2FaOyZA%3D&reserved=0
>    3425.html
>
>    Affected kernels: 5.14, 5.14.1 and 5.13.14
>
>    Last working kernel: 5.13.13
>
>    Problem statement:
>
>    The server with NVDIMMs won't boot throwing lots of misleading errors.

Hi Andrew,

your issue looks very similar to LP1942215[1]: can you install the test kernel
provided in #12 and follow up with your results there?

Thank you.

1: https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugs.launchpad.net%2Fubuntu%2F%2Bsource%2Flinux%2F%2Bbug%2F1942215&data=04%7C01%7C%7C5454f3d9dadf45fc584708d972ab3bdf%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637666902032503492%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=Rw4o%2B5mVamzPGD%2F0GBSnD37XdKIvBMxgBtRhUTVypgc%3D&reserved=0
--
bye,
p.
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