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Date:	Thu, 10 Sep 2015 15:03:36 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Marcelo Ricardo Leitner' <marcelo.leitner@...il.com>,
	David Miller <davem@...emloft.net>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"vyasevich@...il.com" <vyasevich@...il.com>,
	"nhorman@...driver.com" <nhorman@...driver.com>,
	"linux-sctp@...r.kernel.org" <linux-sctp@...r.kernel.org>
Subject: RE: [PATCH net] sctp: fix race on protocol/netns initialization

From: Marcelo Ricardo 
> Sent: 10 September 2015 15:36
...
> > Given that the first ->create() blocks while the protocol code loads
> > it really wouldn't be right to error a subsequent ->create() because
> > the load hasn't completed.
> 
> Can't say I don't agree with you, but at the same time, there are other
> temporary errors that can happen and that the user should just retry.
> This would be just another condition in a trade off for avoiding complexity.

We do retry, but the delay messes up out test scripts :-(

> > I hold a semaphore across sock_create_kern() because of issues with sctp.
> > (Current kernels are nowhere near as bad as really old ones though.)
> 
> Oh, that's not good to hear. I'll experiment with that later, try to
> catch some bugs. :)

I mean REALLY old - like 2.6.12 (FC3).
I'm pretty sure I've seen oops as well as create failing.

We don't create enough sockets for the semaphore to be a problem.

OTOH I've a current problem with a customer using RHEL5.8 (basically 2.6.18).
They might manage to move to RHEL6 (2.6.32) - but that could take a year or two.
RH might be pulling some of the SCTP fixes, but I doubt they get priority.

	David

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