Re: bug, or is it? - SCHED_RR and FPU related

[Nick Piggin]

Rudo Thomas wrote:

> 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.

Hi Rudo,
xmms probably goes into an infinite loop, preventing anything else
from being scheduled, right? If that's the case then this is correct
behaviour.


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