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    SubjectRe: [PATCH] updated preempt-kernel
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    On Sun, 2001-10-21 at 11:24, Andrew Morton wrote:
    > This one has been reported before.

    Colin, can you try Andrew's patch and report back? This problem has
    been reported before -- its a tty bug that preempt (and SMP I wager)
    just aggravate. I have a patch that I know fixes it, but Andrew's is
    _much_ simpler. I will send you that if this fails. Please let me
    know.

    > --- linux-2.4.12-ac3/drivers/char/console.c Mon Oct 15 16:04:23 2001
    > +++ ac/drivers/char/console.c Sun Oct 21 08:19:42 2001
    > @@ -2387,9 +2387,15 @@ static void con_flush_chars(struct tty_s
    > return;
    >
    > pm_access(pm_con);
    > - acquire_console_sem();
    > - set_cursor(vt->vc_num);
    > - release_console_sem();
    > + if (vt) {
    > + /*
    > + * If we raced with con_close(), `vt' may be null.
    > + * Hence this bandaid. - akpm
    > + */
    > + acquire_console_sem();
    > + set_cursor(vt->vc_num);
    > + release_console_sem();
    > + }
    > }
    >
    > /*

    Robert Love

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