GCC used to store pointers in FP registers on aarch64

[Florian Weimer]

* Attila Szegedi:

>> That seems … quite unlikely.  GCC 8 has seen extensive use on
>> AArch64, on a variety of implementations, and I don't recall
>> problems in this area.  I don't follow AArch64 *that* closely,
>> admittedly, but I expect it would have caused quite a ruckus.
>>
>
> Yeah. The lack of discussion also led me to believe that even if this is an
> issue, it's definitely not a widely encountered one. (It's also possible
> that it's a red herring, although, well, as I said, forcing general regs
> only did fix it.)

Is it non-deterministic?  It might be a context switching issue in the
kernel/hypervisor/firmware.  I usually don't notice fixes for those
because they do not lead to questions whether it's necessary to
rebuild the whole distribution.  These bugs do happen from time to time:

  [PATCH v3 0/8] KVM: arm64: FPSIMD/SVE/SME fixes
  <https://lore.kernel.org/linux-arm-kernel/20250210195226.1215254-1-mark.rutland@arm.com/>