On Wed, 2013-01-09 at 12:45 +0100, Arend van Spriel wrote:
> Maybe this one is already known, but I did not find a post about it. So
> here it is.
>
> Regards,
> Arend
[snip]
> [ 9.589986] =============================================
> [ 9.595365] [ INFO: possible recursive locking detected ]
> [ 9.600745] 3.8.0-rc2-wl-testing-lockdep-00002-ga524cf0 #1 Not tainted
> [ 9.607248] ---------------------------------------------
> [ 9.612626] modprobe/163 is trying to acquire lock:
> [ 9.617486] (&subdev->mutex){+.+.+.}, at: [<f8929c12>]
> nv50_fb_vram_new+0x92/0x230 [nouveau]
> [ 9.626052]
> [ 9.626052] but task is already holding lock:
> [ 9.631865] (&subdev->mutex){+.+.+.}, at: [<f8936505>]
> nv50_disp_data_ctor+0x55/0xc0 [nouveau]
> [ 9.640593]
> [ 9.640593] other info that might help us debug this:
> [ 9.647096] Possible unsafe locking scenario:
> [ 9.647096]
> [ 9.652995] CPU0
> [ 9.655430] ----
> [ 9.657867] lock(&subdev->mutex);
> [ 9.661365] lock(&subdev->mutex);
> [ 9.664863]
> [ 9.664863] *** DEADLOCK ***
> [ 9.664863]
> [ 9.670762] May be due to missing lock nesting notation
Same.
[ 5.995881] =============================================
[ 5.995886] [ INFO: possible recursive locking detected ]
[ 5.995892] 3.8.0-next-20130125+ttypatch-xeon+lockdep #20130125+ttypatch Not tainted
[ 5.995898] ---------------------------------------------
[ 5.995904] modprobe/275 is trying to acquire lock:
[ 5.995909] (&subdev->mutex){+.+.+.}, at: [<ffffffffa00d10b8>] nouveau_instobj_create_+0x48/0x90 [nouveau]
[ 5.995955]
[ 5.995955] but task is already holding lock:
[ 5.995961] (&subdev->mutex){+.+.+.}, at: [<ffffffffa00da3b5>] nv50_disp_data_ctor+0x65/0xd0 [nouveau]
[ 5.995989]
[ 5.995989] other info that might help us debug this:
[ 5.995995] Possible unsafe locking scenario:
[ 5.995995]
[ 5.996001] CPU0
[ 5.996004] ----
[ 5.996005] lock(&subdev->mutex);
[ 5.996005] lock(&subdev->mutex);
[ 5.996005]
[ 5.996005] *** DEADLOCK ***
Regards,
Peter Hurley
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