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

[Marc Zyngier]

+ Ard, Broonie

On 2024-05-16 17:22, Johannes Nixdorf wrote:
> I noticed frequent FS corruption on my M1 MacBook running Linux after
> the Asahi Linux Kernel was updated to 6.9.x (from 6.6.x).
> 
> A git bisect pointed me to 2632e2521769 ("arm64: fpsimd: Implement lazy
> restore for kernel mode FPSIMD").
> 
> This was reproduced with fio's examples/basic-verify.fio (1GB of 
> writing
> was not reliably, 10GB triggered it reliably) on vanilla kernels and
> happens on any storage backend behind dm-crypt.
> 
> I was advised to report it here on IRC.
> 
> This was independently described in [1].
> 
> Regards,
> Johannes Nixdorf
> 
> [1]: https://github.com/tpwrules/nixos-apple-silicon/issues/200
> 
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