map a backend failed with -7

[danieldin95]

root@daniel-book:~# uname -a
Linux daniel-book 5.15.0-88-generic #98~20.04.1-Ubuntu SMP Mon Oct 9 16:43:45 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
root@daniel-book:~# tail -n 10 /var/log/ubbd/ubbdd.log
2023-11-07 15:08:13.925 2977 [INFO] ubbd_rbd_get_size:99:
image get size: 68719476736.
2023-11-07 15:08:13.925 2977 [INFO] rbd_dev_init:91 :
image get size: 68719476736.
2023-11-07 15:08:13.925 2977 [ERROR] send_netlink_add_dev:407: Could not send netlink cmd 0: -7
2023-11-07 15:08:13.925 2977 [ERROR] dev_add_dev_finish:611 : error in add_dev: -7.
2023-11-07 15:08:13.925 2977 [ERROR] dev_add_dev_finish:662 : clean dev up.
2023-11-07 15:08:13.925 2977 [INFO] ubbd_dev_remove:812 : status : 1.
2023-11-07 15:08:13.926 2977 [ERROR] ubbd_dev_remove:826: opend
2023-11-07 15:08:13.926 2977 [INFO] mgmt_map_finish:26 : map finish write rsp to fd: 5, ret: -7
root@daniel-book:~#

[yangdongsheng]

can you paste the dmesg for this operation? that seems it return E2BIG from kernel