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Date:	Sun, 18 Mar 2007 22:33:45 +0200
From:	"Michael S. Tsirkin" <>
To:	Alexey Kuznetsov <>
Cc:	"Michael S. Tsirkin" <>,
	Linux Kernel Mailing List <>,,,
	Roland Dreier <>
Subject: Re: dst_ifdown breaks infiniband?

Quoting Alexey Kuznetsov <>:
Subject: Re: dst_ifdown breaks infiniband?
> > Can dst->neighbour be changed to point to NULL instead, and the neighbour
> > released?
> It should be cleared and we should be sure it will not be destroyed
> before quiescent state.
> Seems, this is the only correct solution, but to do this we have
> to audit all the places where dst->neighbour is dereferenced for
> RCU safety.
> Actually, it is very good you caught this eventually, the bug was
> so _disgusting_ that it was "forgotten" all the time, waiting for
> someone who will point out that the king is naked. :-)

Actually that might not be too bad:
$grep -rIi 'dst->neighbour' net/ | wc -l

I'll try to do it.

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