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

[Zi Yan]

+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.

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?

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