linux-kernel - [Kernel Panic] 3.10.10-rt7

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Message-ID: <9B7F15AA4177464A8FAB5BE79B14288B88967CEF@vistrex3.vi.vector.int>
Date:	Wed, 20 Nov 2013 12:26:22 +0000
From:	"Frederich, Jens" <Jens.Frederich@...tor.com>
To:	"linux-rt-users@...r.kernel.org" <linux-rt-users@...r.kernel.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [Kernel Panic] 3.10.10-rt7

Hello,

I got a Kernel panic by some long time stress tests. Look here: http://dy.cx/pqP7M.

Furthermore I got sporadic some BUG messages:

[ 1128.358971] BUG: scheduling while atomic: swapper/0/0/0x00010002
[ 1128.358982] Preemption disabled at:[<ffffffff810dfb8a>] cpu_startup_entry+0x17a/0x300

Hardware
--------

My system is a i7 with 4 GB RAM congatec evalboard.

Setup
-----

On the system runs Linux RT (text mode) 3.10.10-rt7 with 1 GB RAM and a
Windows 7 KVM/QEMU (Qemu 1.6.1) guest with 3 GB RAM. Each system has it own
ethernet card. The Win 7 guest uses it per pci pass-through. The Win 7 is
pinned to core 2,3.

Scenario
--------

We sending UDP packages every 1 msec on the Linux side. The UDP sender process
has real time prio 80 and the ethernet driver 90. At the same time we are
stressing Win 7. Memory stress - allocate as much as possible and do memset(),
then CPU stress - high CPU load, then Kernel DPC stress - high load thread at
DPC level and ethernet stress - send UDP packages every milliseconds. I got the
panic after 45 minutes. It seems that is correlates with the ethernet stress.

Can anybody help me?

thanks
Jens

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