id = 945
title = "For QEMU 7.0.0-rc1, nbd-server-add fails with qcow2 image with iothread in migration context"
state = "closed"
created_at = "2022-03-28T12:54:24.088Z"
closed_at = "2022-05-05T13:08:56.304Z"
labels = ["Regression", "Storage"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/945"
host-os = "Proxmox VE 7.1 (but using upstream QEMU build)"
host-arch = "x86"
qemu-version = "QEMU emulator version 6.2.91 (v7.0.0-rc1)"
guest-os = "n/a"
guest-arch = "n/a"
description = """Upon adding the drive for NBD (via QMP), there is an error message
````kvm: ../block.c:3657: bdrv_open_child: Assertion `qemu_in_main_thread()' failed.````
and then the process aborts."""
reproduce = """1. Create image: `qemu-img create -f qcow2 /root/target-disk.qcow2 4G`
2. Start QEMU as mentioned above.
3. Issue `nbd-server-start` QMP command (I used type unix).
4. Issue `nbd-server-add` command for the single disk."""
additional = "n/a"