On Fri, Jan 15, 2016 at 02:37:15PM +0100, Sebastian Andrzej Siewior wrote:
> I managed to trigger this:
> | INFO: trying to register non-static key.
> | the code is fine but needs lockdep annotation.
> | turning off the locking correctness validator.
> | CPU: 1 PID: 781 Comm: systemd-gpt-aut Not tainted 4.4.0-rt2+ #14
> | Hardware name: ARM-Versatile Express
> | [<80307cec>] (dump_stack)
> | [<80070e98>] (__lock_acquire)
> | [<8007184c>] (lock_acquire)
> | [<80287800>] (btrfs_ioctl)
> | [<8012a8d4>] (do_vfs_ioctl)
> | [<8012ac14>] (SyS_ioctl)
>
> so I think that btrfs_device_data_ordered_init() is not invoked behind
> a macro somewhere.
Right, and it hasn't been invoked anywhere since it's introduction.
Accidentally working because the initial value is 0 (and the device
struct is zeroed), but the lockdep structure is not valid.
> Fixes: 7cc8e58d53cd ("Btrfs: fix unprotected device's variants on 32bits machine")
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
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