On May 23, 2023 8:52:53 PM PDT, "Daniel Díaz" daniel.diaz@linaro.org wrote:
Hello!
On Tue, 23 May 2023 at 00:28, Vlastimil Babka vbabka@suse.cz wrote:
On 5/22/23 20:23, Daniel Díaz wrote:
Hello!
Would the stable maintainers please consider backporting the following commit to the 6.1? We are trying to build gki_defconfig (plus a few extras) on Arm64 and test it under Qemu-arm64, but it fails to boot. Bisection has pointed here.
You mean the bisection was done to find the first "good" commit between 6.1 and e.g. 6.3?
As others said, this commit wasn't expected to be a fix to a known bug. Maybe you found one that we didn't know of, or it might be accidentaly masking some other bug.
How interesting! Yes, we happened to run a bisection between v6.1 and v6.3 and we found where it started working with the following configuration: https://storage.tuxsuite.com/public/linaro/daniel/builds/2QA2CHQUpqKe27FyMZr...
Ah yes, from CONFIG_UBSAN_BOUNDS=y and CONFIG_UBSAN_TRAP=y
This was a known issue in upstream, oddly only exposed on arm64. Something re-broke with __alloc_size after commit 93dd04ab0b2b had tried to work around it. I didn't think any kernel released with this broken, though, so perhaps what broke it got added to -stable?
With that patch on top of v6.1.29 it boots fine under Qemu-arm64; as v6.1.y stands, it panics with this:
It should be fine to backport the patch, IMO.