In particular, the deadlock can occur, together with unlucky timing
between the QEMU threads, when the guest is issuing trim requests
during the start of a backup operation.
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
[ T: resolve trivial merge conflict in series file ]
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>