linux-kernel - RE: [Kernel Panic] 3.10.10-rt7

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Date:	Thu, 21 Nov 2013 08:12:33 +0000
From:	"Frederich, Jens" <Jens.Frederich@...tor.com>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	"linux-rt-users@...r.kernel.org" <linux-rt-users@...r.kernel.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [Kernel Panic] 3.10.10-rt7

>-----Original Message-----
>From: Paul Gortmaker [mailto:paul.gortmaker@...driver.com]
>Sent: Wednesday, November 20, 2013 4:46 PM
>To: Jan Kiszka; Frederich, Jens; linux-rt-users@...r.kernel.org
>Cc: linux-kernel@...r.kernel.org
>Subject: Re: [Kernel Panic] 3.10.10-rt7
>
>On 13-11-20 07:34 AM, Jan Kiszka wrote:
>> On 2013-11-20 13:26, Frederich, Jens wrote:
>>> Hello,
>>>
>>> I got a Kernel panic by some long time stress tests. Look here:
>http://dy.cx/pqP7M.
>>
>> Ah, that should be
>http://thread.gmane.org/gmane.linux.kernel/1564783
>>
>> Paul, was there any follow-up patch on this topic?
>
>Yeah, from the rt-summit [ http://lwn.net/Articles/572740/ ] it is on
>me
>to get those simple wait queue patches mainlined (and then the
>local_bh
>stuff).  Once I've got that done, I'll look at spending some time on
>3.12-rt
>kvm patches -- in the meantime, you are right, the screenshot shows
>that his
>3.10-rt needs the straightforward conversion of vpcu->wq to simple
>wait.
>

It's good to hear.

Paul, can you estimate when the kvm patches is ready, so that I can test it? 

thanks
Jens

>Paul.
>--
>
>>
>> Jan
>>
>>>
>>> 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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