Re: IPv6 route mutex recursion (crash) and fix

From: Brian Fundakowski Feldman (green_at_freebsd.org)
Date: 09/22/04

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    Date: Tue, 21 Sep 2004 22:53:20 -0400
To: "George V. Neville-Neil" <gnn@neville-neil.com>

    On Wed, Sep 22, 2004 at 11:43:17AM +0900, George V. Neville-Neil wrote:
    > At Tue, 21 Sep 2004 22:09:57 -0400,
    > Brian Fundakowski Feldman wrote:
    > >
    > > I've already made noise about this before, so I'll be brief. I plan on
    > > committing the following fix that prevents the routing code from being
    > > recursed upon such that RTM_RESOLVE causes the embryonic new route to
    > > be looked up again. I realize that probably no one will bother trying
    > > to see this bug in action, but all you need to do is send some UDP6 to
    > > ff02::1%<if> as a user, with INVARIANTS turned on.
    > >
    > > Are there any objections? It would be nice to have this in 5-STABLE,
    > > in case anyone actually wants to have IPv6.
    >
    > Unless I am missing something (I have not applied the patch) it's not
    > doing anything. What does the new code actually do?
    >
    > I'll try to try this patch out later.

    Sorry, I should have provided a higher number of lines of context.
    It prevents a call to nd6_lookup() and reentry into the route table
    when entered via RTM_RESOLVE. I.e. nd6_rtrequest(), nd6_is_addr_neighbor(),
    nd6_lookup().

    I appreciate you looking at it; I've had the problem for a year and no one
    bothered to really look at it. 

    -- 
Brian Fundakowski Feldman                           \'[ FreeBSD ]''''''''''\
  <> green@FreeBSD.org                               \  The Power to Serve! \
 Opinions expressed are my own.                       \,,,,,,,,,,,,,,,,,,,,,,\
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