Re: BUG: Global FPU corruption in 2.2

[Alan Cox]

> OK, regardless of how the linux kernel actually manages the FPU for user-space
> 
> programs, does anybody have any comments on the original bugreport?

Complete mystification.

> >of pi begins to look wrong.  Then kill everything and run pi by itself
> >again.  It will no longer produce good results.  We find that the FPU
> >persistently gives bad results until we reboot.
> 
> I tried this on my dual PIII-600 runnng 2.2.19 and got exactly the behavior
> described.

This is the most odd bit of all. The processor state for the FPU is per task
private and each task initializes its own FPU state. In terms of FPU state
itself I don't currently see what there is that can be left behind