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

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Message-ID: <528CD93D.4060609@windriver.com>
Date:	Wed, 20 Nov 2013 10:46:05 -0500
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	Jan Kiszka <jan.kiszka@...mens.com>,
	"Frederich, Jens" <Jens.Frederich@...tor.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

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.

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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