Hi Tom, I can confirm the ARMv8 fp register corruption reported here: https://marc.info/?l=linux-rt-users&m=153930857708206&w=2 still exists in 4.14.106-rt56. I was able to reproduce this on both A57 and Carmel ARMv8 CPUs using the float_bessel subtest of LTP. This fix was to backport the following patch from 4.18.y-rt to 4.14-rt: 3afdfe419c33c1655d0763e070350aad44416594 arm64: fpsimd: use preemp_disable in addition to local_bh_disable() Are you able to pick up this patch into 4.14-rt? I'm sure Anup and I are not the only ones who are hitting this. -Allen
