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From: Marcin Slusarz <marcin.slusarz@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: netdev@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
	linux-kernel@vger.kernel.org,
	Stephen Hemminger <shemminger@linux-foundation.org>,
	"Rafael J. Wysocki" <rjw@sisk.pl>
Subject: Re: locking api self-test hanging
Date: Tue, 4 Mar 2008 20:04:28 +0100	[thread overview]
Message-ID: <20080304190424.GA6820@joi> (raw)
In-Reply-To: <20080303210540.cea55e13.akpm@linux-foundation.org>

On Mon, Mar 03, 2008 at 09:05:40PM -0800, Andrew Morton wrote:
> On Wed, 6 Feb 2008 01:16:43 -0800 Andrew Morton <akpm@linux-foundation.org> wrote:
> 
> > On Wed, 6 Feb 2008 00:34:12 -0800 Andrew Morton <akpm@linux-foundation.org> wrote:
> > 
> > > On Mon, 4 Feb 2008 04:43:04 -0800 Andrew Morton <akpm@linux-foundation.org> wrote:
> > > 
> > > > On Sun, 3 Feb 2008 15:07:44 -0800 Andrew Morton <akpm@linux-foundation.org> wrote:
> > > > 
> > > > > On Sun, 3 Feb 2008 15:02:46 -0800 Andrew Morton <akpm@linux-foundation.org> wrote:
> > > > > 
> > > > > > 
> > > > > > With current mainline I'm getting intermittent hangs here:
> > > > > > 
> > > > > > 	http://userweb.kernel.org/~akpm/p2033590.jpg
> > > > > > 
> > > > > > with this config:
> > > > > > 
> > > > > > 	http://userweb.kernel.org/~akpm/config-sony.txt
> > > > > > 
> > > > > > on the Vaio.  Sometimes it boots (then hits another different hang),
> > > > > > sometimes it gets stuck there.
> > > > 
> > > > CONFIG_DEBUG_LOCKING_API_SELFTESTS=n fixed that up.
> > > > 
> > > > > 
> > > > > The second hang is in kobject_uevent_init().  All that function does is call
> > > > > netlink_kernel_create().
> > > > 
> > > > And I've fully bisected this hang twice and both times came up with
> > > > 
> > > > commit 33f807ba0d9259e7c75c7a2ce8bd2787e5b540c7
> > > > Author: Stephen Hemminger <shemminger@linux-foundation.org>
> > > > Date:   Mon Nov 19 19:24:52 2007 -0800
> > > > 
> > > >     [NETPOLL]: Kill NETPOLL_RX_DROP, set but never tested.
> > > > 
> > > > which is stupid because that patch doesn't do anything.
> > > > 
> > > > However I am using netconsole-over-e100 and the hang does go away when I
> > > > disable netconsole on the kernel boot command line.
> > > > 
> > > > I'd say it's some timing thing in netpoll/netconsole/napi/etc.
> > > > 
> > > 
> > > I'm seeing this netconsole hang on a second machine now.  Current
> > > mainline.  It also has e100.  This one is SMP ancient PIII.
> > > 
> > > Config: http://userweb.kernel.org/~akpm/config-vmm.txt
> > > 
> > 
> > I can reproduce this on a third machine: the t61p laptop: dual x86_64 with
> > e1000.
> > 
> > It seems to need quite a lot of printk activity to make it happen.  Turning
> > on initcall_debug is a suitable way of triggering it.
> > 
I've seen it once too. But I thought it had something to do with this:
http://lkml.org/lkml/2008/3/2/91

> This netconsole regression is still present in current mainline.  Rafael,
> can you please add it to the list?
> 
> It's strange that I can hit it on three separate machines with e100 and e1000
> yet nobody else has reported it (afaik).  Is nobody using netconsole?

ps: I don't have any e100* card

      parent reply	other threads:[~2008-03-04 19:05 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-03 23:02 Andrew Morton
2008-02-03 23:07 ` Andrew Morton
2008-02-04 12:43   ` Andrew Morton
2008-02-04 13:04     ` Andrew Morton
2008-02-04 13:14       ` Peter Zijlstra
2008-02-05 13:23       ` Bernhard Walle
2008-02-04 13:18     ` Andrew Morton
2008-02-06  8:34     ` Andrew Morton
2008-02-06  9:16       ` Andrew Morton
2008-03-04  5:05         ` Andrew Morton
2008-03-04  8:06           ` [patch] mark netconsole broken Ingo Molnar
2008-03-04 16:19             ` Randy Dunlap
2008-03-04 20:30             ` David Miller
2008-03-04 20:52               ` Ingo Molnar
2008-03-04  8:40           ` locking api self-test hanging Jarek Poplawski
2008-03-04  9:10             ` Andrew Morton
2008-03-04 19:04           ` Marcin Slusarz [this message]

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