netdev - Re: reproducable panic eviction work queue

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Message-ID: <55AA717D.8080800@cumulusnetworks.com>
Date:	Sat, 18 Jul 2015 17:32:13 +0200
From:	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:	Johan Schuijt <johan@...nsip.nl>
CC:	Eric Dumazet <eric.dumazet@...il.com>,
	"nikolay@...hat.com" <nikolay@...hat.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"fw@...len.de" <fw@...len.de>,
	"chutzpah@...too.org" <chutzpah@...too.org>,
	Robin Geuze <robing@...nsip.nl>,
	Frank Schreuder <fschreuder@...nsip.nl>,
	netdev <netdev@...r.kernel.org>
Subject: Re: reproducable panic eviction work queue

On 07/18/2015 05:28 PM, Johan Schuijt wrote:
> Thx for your looking into this!
> 
>>
>> Thank you for the report, I will try to reproduce this locally
>> Could you please post the full crash log ?
> 
> Of course, please see attached file.
> 
>> Also could you test
>> with a clean current kernel from Linus' tree or Dave's -net ?
> 
> Will do.
> 
>> These are available at:
>> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>> git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
>> respectively.
>>
>> One last question how many IRQs do you pin i.e. how many cores
>> do you actively use for receive ?
> 
> This varies a bit across our systems, but we’ve managed to reproduce this with IRQs pinned on as many as 2,4,8 or 20 cores.
> 
> I won’t have access to our test-setup till Monday again, so I’ll be testing 3 scenario’s then:
> - Your patch
-----
> - Linux tree
> - Dave’s -net tree
Just one of these two would be enough. I couldn't reproduce it here but
I don't have as many machines to test right now and had to improvise with VMs. :-)

> 
> I’ll make sure to keep you posted on all the results then. We have a kernel dump of the panic, so if you need me to extract any data from there just let me know! (Some instructions might be needed)
> 
> - Johan
> 
Great, thank you!

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