bug, or is it? - SCHED_RR and FPU related

[Rudo Thomas]

Hello.

I have stumbled upon a grave bug, I think. I can reproduce a hard lock-up using
xmms and a buggy plugin - only SysRq-B helps. I managed to narrow it down to
"0.5/NAN"-like operation. It only causes a complete hang when xmms is run with
SCHED_RR priority. Otherwise, only xmms hangs. Unfortunately, I was not able to
create a working proof-of-concept program.

The question is - is this a kernel bug, OR something that cannot be prevented
from happening when using SCHED_RR policy?

Tried with 2.6.3-rc[12] and glibc-2.3.2 (-r9 gentoo) with nptl support (if that
matters).

Have a nice day.

Rudo.
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