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    SubjectRe: Hang in 2.6.23-rc5
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    On Sun, Sep 02, 2007 at 11:29:39PM +0200, FD Cami wrote:
    > On Sun, 2 Sep 2007 22:38:28 +0200
    > "Alessandro Suardi" <alessandro.suardi@gmail.com> wrote:
    >
    > > On 9/2/07, charles gagalac <charles.gagalac@gmail.com> wrote:
    > > > On 9/2/07, daryll q wrote:
    > > > > Upgraded my kernel from 2.6.23-rc2 to 2.6.23-rc5.
    > > > >
    > > > > System hangs (caps lock and scroll lock leds are both flashing).
    > > > >
    > > > > It *randomly* happens but most of the time during after login to
    > > > > KDE.
    > > > >
    > > > > I have not investigated it yet because I have not tried doing
    > > > > it before.
    > > > >
    > > > > Also the system is really not responding so I can't do much..
    > > > > Just hope it blue screen so I can send the error code easily :)
    > > >
    > > > i experienced hangs, with the flashing caps and scroll locks as
    > > > you've described, in a few of my later pulls prior to rc5. i
    > > > couldn't reproduce the hangs and my logs didn't show evidence of a
    > > > problem. my system under rc5, so far, hasn't hung on me.
    > > >
    > > > charles
    > >
    > > Oh, I thought I was the only one. I also had a single hang+flashing
    > > Caps & Scroll Lock with -rc5, but haven't had one since.
    > >
    > > I had VMWare Player modules loaded at the time though, and I
    > > recently rebuilt them with the any-any-patch-113 (earlier versions
    > > would not build with very recent kernels).
    > >
    > > -rc4-git2 and -git3 never hung even with VMWare modules loaded.
    > >
    > > So I disabled the autoload of VMWare stuff. The problem has not
    > > reproduced so far. My system is a Dell D610, running updated
    > > Fedora 7, with Intel 915GM video chipset.
    >
    > I've just had a kernel panic, running a vanilla 2.6.23-rc5, no
    > proprietary modules loaded, running X11 under moderate load.
    > 2.6.23-rc[2-4] have been rock solid on the same box. I've reverted
    > to rc4 for now.

    Try this from net-2.6 tree:

    --- a/net/ipv4/tcp_input.c
    +++ b/net/ipv4/tcp_input.c
    @@ -560,7 +560,7 @@ static u32 tcp_rto_min(struct sock *sk)
    struct dst_entry *dst = __sk_dst_get(sk);
    u32 rto_min = TCP_RTO_MIN;

    - if (dst_metric_locked(dst, RTAX_RTO_MIN))
    + if (dst && dst_metric_locked(dst, RTAX_RTO_MIN))
    rto_min = dst->metrics[RTAX_RTO_MIN-1];
    return rto_min;
    }
    -
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