netdev - Re: IPv4/IPv6 sysctl unregistration deadlock

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Date:	Mon, 02 Mar 2009 14:47:25 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	kaber@...sh.net
Cc:	greearb@...delatech.com, shemminger@...tta.com,
	ebiederm@...ssion.com, herbert@...dor.apana.org.au,
	netdev@...r.kernel.org
Subject: Re: IPv4/IPv6 sysctl unregistration deadlock

From: Patrick McHardy <kaber@...sh.net>
Date: Mon, 02 Mar 2009 23:20:49 +0100

> Ben Greear wrote:
> > With both of Stephen's patches included in the latest -rc6 source,
> > I re-ran the test and it seems to be working (I added printks so
> > that I would know the new code was being exercise
> > I had 2000 or so mac-vlans configured, with 10 of them being
> > re-configured concurrently, while also deleting groups of 20-100
> > mac-vlans in my test.  This was locking up reliably before,
> > and now it seems to be working fine.
> > Here's the kernel log showing the ERESTARTSYS in action.  I don't
> > have an easy way to check to see if the VFS (or whatever) retried
> > the call properly, but will let you all know if I see any indication
> > that isn't working.
> > I only saw the ipv6 fixup in my logs, but maybe my test case just
> > doesn't hit the other...
> 
> This looks like its working fine. Despite the non-desirable active
> spinning, this seems like the best fix (actually much simpler than
> I expected to be possible) at this time. If we just could avoid
> the spinning when unnecessary, it would be perfect :)

Could you give that "not actually in-progress" detection a shot?

I don't like the spinning either.
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