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    SubjectRe: locking api self-test hanging
    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


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