[Drbd-dev] [PATCH] Added missing kref_debug_put()'s on failure path of drbd_create_device().

[Philipp Reisner]

Hi Johannes,

the patch does not apply to the current master. Can you find out why, or
find out against which version/Git Hash this patch was created?

best regards,
 Phil

Am Mittwoch, 30. Mai 2018, 17:37:27 CEST schrieb johannes at johannesthoma.com:
> From: Johannes Thoma <johannes at johannesthoma.com>
> 
> On failing late in drbd_create_device() some kref_debug_put()'s
> were missing, which lead to false positives on kref_debug_destroy().
> 
> This patch adds the missing calls.
> 
> Signed-off-by: Johannes Thoma <johannes at johannesthoma.com>
> ---
>  drbd/drbd_main.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drbd/drbd_main.c b/drbd/drbd_main.c
> index 04ec052..ba60e3b 100644
> --- a/drbd/drbd_main.c
> +++ b/drbd/drbd_main.c
> @@ -3762,11 +3762,14 @@ out_remove_peer_device:
>  		kfree(peer_device);
>  		kref_debug_put(&connection->kref_debug, 3);
>  		kref_put(&connection->kref, drbd_destroy_connection);
> +		kref_debug_put(&device->kref_debug, 1);
>  	}
>  	idr_remove(&resource->devices, vnr);
> +	kref_debug_put(&device->kref_debug, 1);
> 
>  out_idr_remove_minor:
>  	idr_remove(&drbd_devices, minor);
> +	kref_debug_put(&device->kref_debug, 1);
>  out_no_minor_idr:
>  	if (locked)
>  		spin_unlock_irq(&resource->req_lock);
> @@ -3787,6 +3790,9 @@ out_no_disk:
>  	blk_cleanup_queue(q);
>  out_no_q:
>  	kref_put(&resource->kref, drbd_destroy_resource);
> +	kref_debug_put(&resource->kref_debug, 4);
> +		/* kref debugging wants an extra put, see has_refs() */
> +	kref_debug_put(&device->kref_debug, 4);
>  	kref_debug_destroy(&device->kref_debug);
>  	kfree(device);
>  	return err;


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