From: Nick Piggin <piggin@cyberone.com.au>
To: Rudo Thomas <rudo@matfyz.cz>
Cc: linux-kernel@vger.kernel.org
Subject: Re: bug, or is it? - SCHED_RR and FPU related
Date: Fri, 13 Feb 2004 09:58:19 +1100 [thread overview]
Message-ID: <402C050B.2040803@cyberone.com.au> (raw)
In-Reply-To: <20040212205708.GA1679@ss1000.ms.mff.cuni.cz>
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.
next prev parent reply other threads:[~2004-02-12 22:58 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-12 20:57 Rudo Thomas
2004-02-12 22:58 ` Nick Piggin [this message]
2004-02-13 0:47 ` Rudo Thomas
2004-02-13 0:57 ` Nick Piggin
2004-02-13 10:02 ` Rudo Thomas
2004-02-13 10:13 ` bug, or is it? - SCHED_RR and futex related Rudo Thomas
2004-02-13 14:37 ` Jamie Lokier
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