Re: ptcwrite panic (with dump)

From: Doug White (dwhite_at_gumbysoft.com)
Date: 05/09/05

  • Next message: Kris Kennaway: "Re: Strange semi-hangs on 5.4" 
    Date: Sun, 8 May 2005 17:00:40 -0700 (PDT)
To: Kris Kennaway <kris@obsecurity.org>

    On Sun, 8 May 2005, Kris Kennaway wrote:

    > $2 = (struct pgrp *) 0x0

    Looks like t_pgrp became NULL between us checking it and us inspecting the
    list attached to it. Nice.

    Try moving the sx_slock(&proctree_lock); grab above the tp->t_pgrp NULL
    check and add a sx_sunlock(&proctree_lock); inside that if() block.

    I don't know if proctree_lock or the per-tty mutex protects the t_pgrp
    item in struct tty. In any case we need to pick up some lock to keep it
    from going away :-)

    I'll bash up a draft patch for discussion. 

    -- 
Doug White                    |  FreeBSD: The Power to Serve
dwhite@gumbysoft.com          |  www.FreeBSD.org
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  • Next message: Kris Kennaway: "Re: Strange semi-hangs on 5.4"

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