blktests nbd/002 failed on rt kernel

[yizhanglinux]

Hi

I found the nbd/002 failed on rt kernel. Here is the log:

================6
nbd/002 (tests on partition handling for an nbd device)      [failed]
    runtime  3.096s  ...  5.067s
    --- tests/nbd/002.out	2026-03-13 15:18:39.565244069 +0000
    +++ /root/blktests/results/nodev/nbd/002.out.bad	2026-03-14 04:59:41.897100740 +0000
    @@ -1,4 +1,4 @@
     Running nbd/002
     Testing IOCTL path
     Testing the netlink path
    -Test complete
    +Connect didn't happen?

# uname -r
7.0.0-0.rc3.28.eln155.aarch64+rt

# dmesg | tail -13
[   84.490262] block nbd0: shutting down sockets
[   84.810844] run blktests nbd/002 at 2026-03-14 04:59:36
[   85.182730] nbd0: detected capacity change from 0 to 20971520
[   85.197756]  nbd0:
[   85.277178] block nbd0: NBD_DISCONNECT
[   85.277268] block nbd0: Disconnected due to user request.
[   85.277271] block nbd0: shutting down sockets
[   85.762713] nbd0: detected capacity change from 0 to 20971520
[   85.764402]  nbd0: p1
[   86.739976] block nbd0: NBD_DISCONNECT
[   86.740101] block nbd0: Disconnected due to user request.
[   86.740104] block nbd0: shutting down sockets
[   86.852538] nbd: nbd0 already in use