On 12/1/22 04:58, Ivan Zahariev wrote: > We are running 5.15.75 (LTS) but the problem started when we upgraded > from 5.15.31 to 5.15.59 and is present ever since. I erroneously said > that it's present into every 5.15. > I didn't do my homework well and blamed the commit by Yu-cheng Yu. > But this commit never landed into 5.15, nor the fix commit that you> > referred. There are no functions fpu__clear_all(), > copy_init_fpstate_to_fpregs(), copy_user_to_xstate() anywhere in the> > sources of 5.15.75 or 5.15.31, so the 5.15 kernel is running with a > different FPU implementation. It's also possible that the Ubuntu kernel folks pulled some FPU patches into their 5.15 kernel from later upstream kernels, which is adding to the confusion. I think there may have been some effort to backport the AMX work. You might want to file a bug report with the Ubuntu folks.
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