netdev - Re: reproducable panic eviction work queue

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Message-ID: <22C5EB62-8974-432D-9C3B-45F4E4067A45@transip.nl>
Date:	Sat, 18 Jul 2015 15:28:02 +0000
From:	Johan Schuijt <johan@...nsip.nl>
To:	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
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

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

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