Re: [-next regression] lockdep? tracing? BUG: unable to handlekernel paging request at

From: Eric Paris
Date: Tue Nov 03 2009 - 11:23:19 EST


On Tue, 2009-11-03 at 11:02 -0500, Steven Rostedt wrote:
> [ Added Peter Zijlstra ]
>
> On Tue, 2009-11-03 at 10:48 -0500, Eric Paris wrote:
> > Linux-next from Oct 30 did not have this problem. Linux next from
> > yesterday (and today) I always hit this on boot.
>
> Could you also give the SHA1 of Linux-next, as well as the config you
> used.

cb9267934a27b149416762308a36e8a61f04ecb2

> >
> > [ 7.989630] BUG: unable to handle kernel paging request at 00000000000160de
> > [ 7.990538] IP: [<ffffffff8123cdbf>] strcmp+0xf/0x30
> > [ 7.990538] PGD 77f7e067 PUD 77ff1067 PMD 0
> > [ 7.990538] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
> > [ 7.990538] last sysfs file: /sys/devices/platform/i8042/serio0/input/input2/event2/uevent
> > [ 7.990538] CPU 0
> > [ 7.990538] Modules linked in: ata_piix(+)
> > [ 7.990538] Pid: 1024, comm: modprobe Not tainted 2.6.32-rc5-fanotify-next-20091102 #150
>
> Just curious, what module were you loading?

Looking at strace of the modprobe command it shows at the bottom I
believe it was ata_generic. But I don't really know.

> Hmm, event_mutex is defined with
>
> DEFINE_MUTEX(event_mutex);
>
> in trace_events.c (well, in my kernel, I'm not looking at linux-next
> right now). This should set up lockdep without any issues.

It's a DEFINE_MUTEX in linux-next as well.

> Would be better to get more info (as asked above). You can send
> the .config privately to me, as not to spam LKML with it.

Incoming along will full dmesg.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/