linux-kernel - Re: 2.6.23 WARNING: at kernel/softirq.c:139 local_bh

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Message-ID: <20071123192032.GB19691@waste.org>
Date:	Fri, 23 Nov 2007 13:20:33 -0600
From:	Matt Mackall <mpm@...enic.com>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Simon Arlott <simon@...e.lp0.eu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org, Ingo Molnar <mingo@...hat.com>
Subject: Re: 2.6.23 WARNING: at kernel/softirq.c:139 local_bh_enable()

On Fri, Nov 23, 2007 at 10:15:24PM +0300, Evgeniy Polyakov wrote:
> On Fri, Nov 23, 2007 at 12:59:43PM -0600, Matt Mackall (mpm@...enic.com) wrote:
> > So I'd be surprised if that was a problem. But I can imagine having
> > problems for skbs without destructors which run into one of these in
> > __kfree_skb:
> > 
> > dst_release
> > secpath_put
> > nf_conntrack_put
> > nf_conntrack_put_reasm
> > nf_bridge_put
> > 
> > ..some or all of which assume a softirq context.
> 
> bridging is ok, others require softirq context.
> I've sent a patch (the last one should be ok) to guard against xfrm and
> connection tracking.
> 
> > > No matter if we are under memory pressure or whatever - it is not
> > > allowed - a lot of skbs are supposed to be freed in softirq context,
> > > that is why dev_kfree_skb_any() exists.
> > 
> > Some skbs we definitely -can- free in irq context. The only ones we
> > care about are the ones generated by netpoll. If there's a reason you
> > think netpoll's own skbs can't be freed, please describe it.
> 
> Only some and to distinguish them we can not use destructor - if it is
> set (even empty function) it will fire an alarm.

Yep, please look at the patch I just posted.

-- 
Mathematics is the supreme nostalgia of our time.
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