Not difficult to run into, just have a drive with iothread, take a PBS
backup and then take a snapshot or hibernate. Resuming will fail with
> qemu: qemu_mutex_unlock_impl: Operation not permitted
because of not acquiring the correct AioContext first.
Migration is not affected, because it runs in coroutine context.
Reported in the community forum:
https://forum.proxmox.com/threads/129899/
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
