linux-kernel - Re: Hang in 2.6.23-rc5

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Date:	Mon, 3 Sep 2007 01:46:31 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	FD Cami <francois.cami@...e.fr>
Cc:	Alessandro Suardi <alessandro.suardi@...il.com>,
	charles gagalac <charles.gagalac@...il.com>,
	daryll q <daryll_26m@...oo.com.ph>,
	linux-kernel@...r.kernel.org
Subject: Re: Hang in 2.6.23-rc5

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@...il.com> wrote:
> 
> > On 9/2/07, charles gagalac <charles.gagalac@...il.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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