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Date:	Tue, 24 May 2011 23:06:09 -0700
From:	Arun Sharma <>
To:	Eric Dumazet <>
Cc:	Arun Sharma <>,
	Maximilian Engelhardt <>,,,
	StuStaNet Vorstand <>
Subject: Re: Kernel crash after using new Intel NIC (igb)

On Wed, May 25, 2011 at 04:44:29AM +0200, Eric Dumazet wrote:
> Hmm, thanks for the report. Are you running x86 or another arch ?

This was on x86.

> We probably need some sort of memory barrier.
> However, locking this central lock makes the thing too slow, I'll try to
> use an atomic_inc_return on p->refcnt instead. (and then lock
> unused_peers.lock if we got a 0->1 transition)

Another possibility is to do the list_empty() check twice. Once without
taking the lock and again with the spinlock held.

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