Error ret=-1 with EINTR in nbd_connect_systemd_socket_activation()

[Motohiro Kawahito]

Hi, I’d like to connect to an encrypted QCOW2 file by nbd_connect_systemd_socket_activation(), but I got ret=-1 with EINTR.

The arg parameter I used is

qemu-nbd --object secret,id=sec0,data="" --image-opts driver=qcow2,encrypt.format=luks,encrypt.key-secret=sec0,file.filename=/tmp/empty.qcow2

 

Can you find what a problem is? The version of qemu-nbd is

$ qemu-nbd -V

qemu-nbd 4.2.1 (Debian 1:4.2-3ubuntu6.23)

 

I created this encrypted QCOW2 image by the following command.

qemu-img create --object secret,id=sec0,data="" -f qcow2 -o encrypt.format=luks,encrypt.key-secret=sec0 /tmp/empty.qcow2 8539292672

 

Note that I can connect to a normal QCOW2 file by this function without any error. (arg: qemu-nbd -f qcow2 /tmp/normal.qcow2)