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I used SPDK to create a Unix socket file and provided it to QEMU. When my file is placed in the /dev/shm or /run/spdk directory, there is no problem. But if it is placed in the /dev/ or /dev/spdk directory, the information is as follows:

/usr/libexec/qemu-kvm -name guest=s1.a
.....
ddr=0x3,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1,write-cache=on -chardev socket,id=char-virtio-disk1,path=/dev/spdk/Nvme0m0n1-2-2-lv0,reconnect=1
-device vhost-user-blk-pci,id=dev-virtio-disk1,chardev=char-virtio-disk1,bus=pci.0,addr=0x6 ......
qemu-kvm: -device vhost-user-blk-pci,id=dev-virtio-disk1,chardev=char-virtio-disk1,bus=pci.0,addr=0x6: Failed to connect socket /dev/spdk/Nvme0m0n1-2-2-lv0: No
such file or directory
qemu-kvm: -device cirrus-vga,id=video0,bus=pci.0,addr=0x2: warning: 'cirrus-vga' is deprecated, please use a different VGA card instead
qemu-kvm: Unable to connect character device char-virtio-disk1: Failed to connect socket /dev/spdk/Nvme0m0n1-2-2-lv0: No such file or directory

There is some difference: /dev/shm or /run/spdk is tmpfs type, /dev/ or /dev/spdk is devtmpfs type.

I set the file permissions to be the same and the same phenomenon occurs.

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