[bug] aarch64 host no longer boots after 767507654c22 ("arch_numa: switch over to numa_memblks")

[Jan Stancek]

On Tue, Oct 29, 2024 at 4:07 PM Zi Yan <ziy at nvidia.com> wrote:
>
> +tegra mailing list and maintainers
>
> On 29 Oct 2024, at 8:47, Jan Stancek wrote:
>
> > Hi,
> >
> > I'm seeing a regression on Nvidia IGX system, which no longer boots.
> >
> > bisect points at commit 767507654c22 ("arch_numa: switch over to numa_memblks").
> > It hangs very early, with 4k or 64k pages, with no kernel messages printed:
> >
> > EFI stub: Booting Linux Kernel...
> > EFI stub: Using DTB from configuration table
> > EFI stub: Exiting boot services...
> > <hangs here>
> >
>
> Is it possible to have earlycon output? It is hard to debug without any
> information except kernel fails to boot.

I know it was a long shot, so far I haven't had luck getting it to work.

>
> Since the previous commit boots and I assume both kernels are compiled
> with the same gcc toolchain, this should not be caused by the binuils
> bug in 2.42[1]. Is your binutils version 2.42?

Yes, both are compiled locally, with binutils 2.41

>
> Thanks.
>
>
> [1] https://sourceware.org/bugzilla/show_bug.cgi?id=31924
>
> > Here's a log from successful boot with previous commit:
> > https://people.redhat.com/jstancek/aarch64_numa_boot/console-log-good.txt
> > and config: https://people.redhat.com/jstancek/aarch64_numa_boot/config
> >
> > # lscpu
> > Architecture:             aarch64
> >   CPU op-mode(s):         32-bit, 64-bit
> >   Byte Order:             Little Endian
> > CPU(s):                   12
> >   On-line CPU(s) list:    0-11
> > Vendor ID:                ARM
> >   BIOS Vendor ID:         NVIDIA
> >   Model name:             Cortex-A78AE
> >     BIOS Model name:      Not Specified Not Specified CPU @ 0.0GHz
> >     BIOS CPU family:      257
> >     Model:                1
> >     Thread(s) per core:   1
> >     Core(s) per cluster:  12
> >     Socket(s):            1
> >     Cluster(s):           1
> >     Stepping:             r0p1
> >     CPU(s) scaling MHz:   100%
> >     CPU max MHz:          1971.2000
> >     CPU min MHz:          115.2000
> >     BogoMIPS:             62.50
> >     Flags:                fp asimd evtstrm aes pmull sha1 sha2 crc32
> > atomics fphp asimdhp cpuid asimdrdm lrcpc dcpop asimddp uscat ilrcpc
> > flagm paca pacg
> > Caches (sum of all):
> >   L1d:                    768 KiB (12 instances)
> >   L1i:                    768 KiB (12 instances)
> >   L2:                     3 MiB (12 instances)
> >   L3:                     6 MiB (3 instances)
> > NUMA:
> >   NUMA node(s):           1
> >   NUMA node0 CPU(s):      0-11
> > Vulnerabilities:
> >   Gather data sampling:   Not affected
> >   Itlb multihit:          Not affected
> >   L1tf:                   Not affected
> >   Mds:                    Not affected
> >   Meltdown:               Not affected
> >   Mmio stale data:        Not affected
> >   Reg file data sampling: Not affected
> >   Retbleed:               Not affected
> >   Spec rstack overflow:   Not affected
> >   Spec store bypass:      Mitigation; Speculative Store Bypass
> > disabled via prctl
> >   Spectre v1:             Mitigation; __user pointer sanitization
> >   Spectre v2:             Mitigation; CSV2, BHB
> >   Srbds:                  Not affected
> >   Tsx async abort:        Not affected
> >
> > Regards,
> > Jan
>
>
> Best Regards,
> Yan, Zi
>