netdev - Re: reproducable panic eviction work queue

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Message-ID: <55ACEDE9.3090205@transip.nl>
Date:	Mon, 20 Jul 2015 14:47:37 +0200
From:	Frank Schreuder <fschreuder@...nsip.nl>
To:	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
	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>,
	netdev <netdev@...r.kernel.org>
Subject: Re: reproducable panic eviction work queue


On 7/18/2015  05:32 PM, Nikolay Aleksandrov wrote:
> 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!
>
I'm able to reproduce this panic on the following kernel builds:
- 3.18.7
- 3.18.18
- 3.18.18 + patch from Nikolay Aleksandrov
- 4.1.0

Would you happen to have any more suggestions we can try?

Thanks,
Frank

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