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Re: [PATCH 8/9] xen/arm: Allow the user to build Xen with USBAN
- To: Henry Wang <Henry.Wang@xxxxxxx>, Julien Grall <julien@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 26 Jun 2023 12:57:20 +0100
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- Cc: Luca Fancellu <Luca.Fancellu@xxxxxxx>, "michal.orzel@xxxxxxx" <michal.orzel@xxxxxxx>, Julien Grall <jgrall@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Bertrand Marquis <Bertrand.Marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 26/06/2023 8:29 am, Henry Wang wrote:
> However, I noticed Xen will print below during the Dom0 boot:
> (XEN)
> ================================================================================
> (XEN) UBSAN: Undefined behaviour in arch/arm/vgic.c:371:15
> (XEN) left shift of 1 by 31 places cannot be represented in type 'int'
> (XEN) Xen WARN at common/ubsan/ubsan.c:172
>
> Just want to make sure you also noticed this, otherwise maybe you
> can include another patch in the series to fix this? Or I can do that
> in case you don't have enough bandwidth.
Just as a general note. What UBSAN does and doesn't notice depends on
your compiler, optimisation level, etc, and whether you encounter a
problem case depends on your hardware.
Finding differing reports from different people is entirely normal.
~Andrew
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