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Re: [kernel-6.5-bug] with xen-4.18~rc4 on ub-24.04 noble, booting xen domU shows UBSAN errors in blkback & netback drivers
- To: Pry Mar <pryorm09@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 7 Nov 2023 12:00:23 +0100
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- Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 07 Nov 2023 11:00:37 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 06.11.2023 20:20, Pry Mar wrote:
> These 2 errors show in dmesg late in boot process when xen domU launch:
> 1) blkback
> UBSAN: array-index-out-of-bounds in
> /build/linux-D15vQj/linux-6.5.0/drivers/block/xen-blkback/blkback.c:1227:4
>
> 2) netback
> [ 55.209063] UBSAN: array-index-out-of-bounds in
> /build/linux-D15vQj/linux-6.5.0/drivers/net/xen-netback/netback.c:289:3
> [ 55.209268] index 3 is out of range for type 'xen_netif_tx_sring_entry
> [1]'
> [ 55.209401] CPU: 3 PID: 0 Comm: swapper/3 Not tainted 6.5.0-9-generic
> #9-Ubuntu
>
> The xen sources don't seem to generate these UBSAN errors and I included
> the patch from staging-4.18. It seems only the xen related kernel drivers
> are
> doing UBSAN errors.
While I have to admit that I find your report a little confusing, I kind of
guess that what you're reporting would be addressed by
https://lists.xen.org/archives/html/xen-devel/2023-07/msg01837.html (once
it was put in suitable shape to be committed, and once it was then further
pulled over into the Linux tree).
Jan
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