Messages in this thread | | | Date | Mon, 4 Feb 2008 05:18:45 -0800 | From | Andrew Morton <> | Subject | Re: locking api self-test hanging |
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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 expect the locking API self-tests are innocent - the netconsole lockup happened to strike during the locking API tests and fooled me. When I disabled those tests, the netconsole lockup struck later on.
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