[BUG] dm-crypt broken after 2632e2521769 ("arm64: fpsimd: Implement lazy restore for kernel mode FPSIMD")

[Mark Brown]

On Tue, May 21, 2024 at 10:06:36PM +0200, Janne Grunau wrote:

> Running SIMD intense workloads in user space apparently increase the
> reproduction odds. When running AV1 decoding using dav1d in parallel
> errors appear faster. Errors manifest either in changed decoder
> output, fio verification errors or both. I'm using `dav1d -i
> sample.ivf --muxer xxh3 -o -` here as user space SIMD payload but I'd
> assume the exact SIMD user space code doesn't matter as long as it
> runs on all CPU cores.

There's fp-stress in tools/testing/selftests/arm64/fp which will run two
copies of fpsimd-test (from the same directory) per core in parallel
looking for corruption in the FPSIMD registers.  Specify '-t -1' and
it'll run for ever.
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